Sony SOBAX 2500 Calculator - Madrona

Contents Section Page

Title & Contents (this page) 1Block Diagram 2Section & Signal Name Descriptions 3Timing (clock & slice) & Initialisation 4Timing (bit & digit) 5Keyboard 6Control (part 1) 7Control (part 2) 8Control (part 3) 9Control (part 4) 10Q Counter & DP Counter 11J Counter 12P Counter 13N Register 14M Register 15Main Register (A,B,C,D,E) Data Switches 16Main Registers (A,B,C,D,E) 17X Register 18Y Register 19Misc. Registers 20Display 21Power Supply & Unused Gates 22Timing Diagram, Bit Codes & IC Pinouts 23Connectors 24

Sony SOBAX 2500Calculator

Notes

• The symbol denotes V+4.

• connection between different sections. connection limited to same section.

Arrows indicate direction of signal or energy flow.

• A lowercase ‘n’ at the beginning of a symbol name indicates the logical NOT operation.

• Resistance in ohms unless otherwise indicated.

• Capacitance in microfarads unless otherwise indicated.

• The Acoustic Delay Line is based on magnetostrictive principles.See the article “Magnetostrictive Delay Lines” in “Electronics World”, Jan. 1964.

• These drawings based on unit with Serial No. 620173 which contains a Board F marked with 1-539-224-12. Component values marked with “*” are the values for Board F marked with 1-539-224-11.

Log

• 1999 Sep-Nov: Initial drawing / bhilpert.

• 2005 Feb 19: MSYNC source corrected, comes from Q7 rather than Q8. Corrections to labels on flip-flops in display page.

• 2005 Feb 20: Some additional labeling of “*” components for board F.

• 2014 May: Backplane connectors correction for V+4/GND, numeric key coupling distinguished, other minor reorganisation.

Sony SOBAX 2500 CalculatorSection: Title & Contents

Page: 1 Rendition: 2014 May 7

This schematic has been derived through reverse engineering.This is not the manufacter’s schematic, nor is it based on the manufacturer’s schematic.

to all sections

Sony SOBAX 2500 CalculatorSection: Block Diagram


Display Latchand Display

C Register

A Register

B Register

D Register

X Register

Y Register

F Register G Register

INA

INB

DDCOMP

YM

ACOMPBCE

AX

XN

AY

X

N?YA

XFA

BACOMP

DCOMP

N Register

KeyboardNumeral Keys

KeyboardFunction Keys

EP

M Register

N

N M

Y

X

D

AACOMP

J Counter

Q Counter

DP Counter

C

E

to all sections

Power Supply

to all sections

Timing

FA

P Counter

V Reg

W Reg

OVF Reg

1 bit reg 4-bit register 16 digit register

Keyboardmode switches,C-ALL, C-ENT,

<, >, DPand CHG-SIGN

keys

N

EP

AIN

BIN

CIN

DIN

EIN

EP

A

ACOMP

B

D

DCOMP

E Registers

M1 M2 M3 M4

M5 P7M6 P6M7 P5 P4 P3 P2 P1

Control

FD FC FB FA

KFD KFC KFB KFA

GD GC GB GA

KW K4 K2 K1

XW X4 X2 X1

DDISZ Reg

INTØD Reg

S A S M

Sony SOBAX 2500 CalculatorSection: Section & Signal Name Descriptions


Section S i gna l Descr ip t ionTiming Master timing and power-on initialisation.

Ø Master clock.ØS… Sliced bit timing. The bits of the 15 main registers are interleaved in the Acoustic

Delay Line by slicing each ‘major’ bit into 16 parts. The remaining slice is used forsynchronizing the frequency of the master clock to the cycle time of the delay line.

ØB… ‘Major’ bit timing.ØD… Digit timing (4 major bits constitutes a digit).ØDINS During some calculation phases, the 16-digit cycle is extended one digit period by

inserting another ‘digit’ between ØD11 and ØD12. The inserted period is ØDINS.RDY Ready. Low when power is turned on, goes high after initialisation is complete.INITP Initialisation pulses. A stream of pulses during initialisation (not-ready).PWROFFP Power Off Pulse.

Keyboard The keyboard and encoders for numerals and functions.KMAN Manual mode.KAUTO Execute program mode.KLEARN Learn program mode.KOPER Operate mode.KCHECK Check program mode.KMAO Manual / Auto / Operate.KTON Tally mode on.KTREAD Tally read.KR54 5 up / 4 down rounding mode.KRDWN Round down mode (truncate).KRØD Selected digit pulse for rounding.KCA Clear all.KCE Clear entry.KSL Shift left.KSR Shift right.KSCS Shift or change sign.KDP Decimal point.KPS Program step (S key).KFA,KFB,KFC,KFD Encoded function keys. These are the same as FA, FB, FC, FD.K1,K2,K4,KW Encoded numeral keys.

Control Control registers & logic.F… 4 bit register for function keystrokes and program instructions to be executed.G… Secondary function register loaded from the F register.S… Assorted state registers.

All these registers clock on a 16-digit cycle (17 when ØDINS active).T… Misc control logic. These are combinations of the state registers.U… More control logic. These are combinations of the function register and state registers.AISNEG Indicates the number in the A register is negative.

(Appears to also be used for other purposes).DISNEG Indicates the number in the D register is negative.ANEGJ

Q Counter 16 squared counter. Counter for16 cycles of 16 or 17 digits.QQA

DP Counter Decimal point timing counter.DP Signal to the display to turn on the decimal point at the appropriate times.UNITØD Pulses during the digit which is currently the units digit.CHGSGN Change Sign.

J Counter Multi-use counter for fraction fill count, digit position to start zero blanking and more.JJA, JB, JC

Section S i gna l Descr ip t ionP Counter The program counter. This must select one of the 7 program registers in the E group as

well as track a position within the selected register.PØS Timing slice for selecting 1 of 7 program registers in the E register group.P1ST Program at beginning.PEXP Program memory expended.POVFPA

N Register 4-bit register for numeric keystrokes.N Bit stream from the N register.NPRESS Numeric key has been pressed.NPRESSA

M Register 4-bit register to indicate which memory is currently selected.M Bit stream from the M register.MØS Timing slice for selecting 1 of 7 memory registers in the E register group.MEM1 Memory 1 is selected.

Main Data Switches Data switches to select inputs to the Main Registers.AIN Bit stream into the A register.BINCINDINEINEIN_ENB Enable the input to the currently selected register in the E register group.ACOMP Complementary form of bit stream from the A register in accordance with AISNEG.DCOMP Complementary form of bit stream from the D register in accordance with DISNEG.EP Bit stream from the E register for program instruction purposes.

Main Registers 15 16-digit registers for the operands and program instructions.A Bit stream from the A register. The A register mimics the D register but with

zeroes (1000) mapped to 0000.B Bit stream from the B register.C Bit stream from the C register.D Bit stream from the D register. The D register contains the number being

displayed. Displayed zeroes are encoded as 1000 and blanked zeroes as 0000.E 11 16-digit registers shared between the 7 memories and program instructions.

4 of these registers are reserved for memories 1,2,3 and 4.4 are reserved for program instructions.The remaining 3 are shared by memories 5,6,7 and program instructions in reverseoverlapping order. Thus a long program will cut into memory 7, then memory 6 then 5.The maximum length of a program is (4+3)*16=112 instructions (functions).

MSYNC Signal from the delay line to automatic frequency control circuit for the master clock.

X Register 4-bit register for arithemetic and transferring numerals on their way from theD register to the display.

X Bit stream from the X register.X1,X2,X4,XW Numerals on their way to the display.XOVFCA Carry Flag.

Y Register 4-bit register.YYR54YA,YB,YC

Misc. RegistersINTØD Goes high during digits which are part of the integral portion of the number.RNDØDDDISZ Output from a register which assesses whether the current register D digit is zero.OVF Overflow latch.V 1-bit register.VA, VB, VCW 1-bit register.

10 3

680680 18K 18K

75pF 100pF

QF13C641

Sony SOBAX 2500 CalculatorSection: Timing (Clock & Slice) & Initialisation


QF18C641

QF19C318A

1K

27K 27K

4.7K

5.6K

30pFQF33QF32*C641

560

560

QF31QF30*C641

220

0.015

100

QF28QF25*C1063

Ø

8.2K

30pF820

QF11C641

nØ

4716V

0.068

1S33275pF

1K

QF10C641

15K

NF8,10 NE7,9

TF15

4

3

F401

5

6

J

K

Q

nQ

2 C9

10

F401

8

7

J

K

Q

nQ

11 C9

10

F402

8

7

J

K

Q

nQ

11 C4

3

F402

5

6

J

K

Q

nQ

2 C9

F403

8

7

J

K

Q

nQ

11 C4

F403

5

6

J

K

Q

nQ

2 C4

3

E114

5

6

J

K

Q

nQ

2 C9

10

E114

8

7

J

K

Q

nQ

11 C

4

3

E113

5

6

J

K

Q

nQ

2 C9

10

E113

8

7

J

K

Q

nQ

11 C4

3

E112

5

6

J

K

Q

nQ

2 C9

10

E112

8

7

J

K

Q

nQ

11 C4

3

E110

5

6

J

K

Q

nQ

2 C9

10

E110

8

7

J

K

Q

nQ

11 C4

3

E109

5

6

J

K

Q

nQ

2 C9

10

E109

8

7

J

K

Q

nQ

11 C

NF26 NE25

TE27

100K

100K

10160V

POWER(closes when unit

is turned off)

V+200

68

2220K*

5150V

27K24K*

2.7K2.4K*

24K

4716V

3

2F304

4567

6

789

F309

NF23,25PWROFFPto main registers

QF20C634A

QF23QF28*C634A

68

3.325V

NF16 NA13

ND21

RDY

nRDY

ØS10

QF16C634A

QF17C634A

560QF14CS1303

QF15CS1303 120K

100K

4.7K

1K

10K

10K

22016V4

10 5F306

11

3

1212

F306

820820

5.6K

20pF 20pF

QF9C641

5.6K

QF12C641

TF12TF14

9

10

F305

8

7

J

K

Q

nQ

11 C4

3

F305

5

6

J

K

Q

nQ

2 C12 T 1 TØ

RDY

f12

f14

4

10 5F3032K

QF1C634A

4716V

22K6

987

F306

f22

f20

ØS0

5

2

F30741

113

12

7

6

1089

F307

nØØS14

nRDY

ØS10

nRDY

5

11

F3083241

12

7

6

8109

F308

RDY

ØB3

nØØS14ØB3

RDY

ØS10

MSYNCfrom main registers

ØD15•B3

ØD15•B3

ØD15•B3

NE11NF12

3

F310

4567

2nRDY nINITPNB10

ØD0ØB0

ØS1 ØS2 ØS3 ØS5 ØS6 ØS7

NF18

NE17

ØS0

NF15

NE15

ØS4

NF24

NE23

ØS8 ØS9 ØS11 ØS12 ØS13

NE21

NF22

ØS10

NE19

NF20

ØS14

f44 f30

1 T 12 T 1 T 12 T 1 T 12 T 1 T 12 TØ Ø Ø Ø Ø Ø ØØ

1 T12 T 12 T 1 T 12 T 1 T 1 T 12 TØ Ø Ø Ø Ø Ø ØØ

DE5 DE7

DE9 DE11 DE8 DE10 DE6 DE4 DE13

150

V–10

V–10

V–10

5

7

2A101

654 NA44

NkT

nØD0

9

10

A107

8

7

J

K

Q

nQ

11 C ØB34

3

A107

5

6

J

K

Q

nQ

2 C9

10

A106

8

7

J

K

Q

nQ

11 C4

3

A106

5 J

K

Q

nQ

2 C1

3

11122

nØD1

A111nØD3nØD7

nØD12

6

nA

3

8

1A101

91011

nØD1

12

7

2A102

654

nØD2

3

8

1A102

91011

nØD3

12

7

2A103

654

nØD4

3

8

1A103

91011

nØD5

12

7

2A104

654

nØD6

3

8

1A104

91011

nØD7

12

7

2A105

654

nØD8

3

8

1A105

91011

nØD9

12

7

2A108

654

nØD10

3

8

1A108

91011

nØD11

12

6

2A109543

nØD12

7

8

1A109

91011 nØD1312

7

2A110

654 nØD143

8

1A110

91011 nØD1512

A B nB C nC D nD

NA42 NkU

NA40 NkV

NA22

QF25QF26*C641

330360*

330360*

QF29C1063

68

68

0.047

100

QF32QF33*C1063

ØB

2.2K

1.5K

12

9

10

F408

8

7

J

K

Q

nQ

11

T

C

ØS0

Ø

ØS5

nØB

f5

NF5,6

NB5,6

NC5,6

ND5,6

NE5,6

NA9,10f8

ØB3NC20

NB19

NE22

NF19

NA24

12

9

10

C116

8

7

J

K

Q

nQ

11

T

C1

4

3

C116

5

6

J

K

Q

nQ

2

T

C

ØB

7

2C316

6543

6

789

C216

10

4 5C216

8

1C316

9101112

TC47

TC45

TC46

NC8 NB7nØB3

NB29

NE40

NKT

NB22

NC21

NE24

7

2E316

6

4ØD15

3NB21

NC22

NE20

7

2E315

654

ØD15•B3

3NB8

ND7

NE8

8

1E316

9101112

ØB3

ØD15

NF17

NKV

8

1E315

9101112

nØD0 ØD0NB43

NC26

NE31

NF32

ØB0NC16

NF14

NB15

ØB

ØB03

Sony SOBAX 2500 CalculatorSection: Timing (Bit & Digit)


nØD15

nAnBnCnD

AnBnCnD

nAB

nCnD

AnBC

nD

nAB

nCD

nAnBC

nD

AnBnC

D

AB

nCnD

nABC

nD

AnBCD

AB

nCD

ABC

nD

ABCD

nABCD

nAnBCD

nAnBnC

D

ØB3 ØB3ØB312

T ØB 1 T 12 T 1 TØB ØBØBB105

J

K

Q

nQ

T

C

ØB 1

4

3

5

2

6

ØB3

10

4 5B308

TW

nØDINS to Q counter, DP counter and J counter

NB18

NA17NA36

NB37

DB1

?

f5

CA

3310V 15KCE

DP

0

1

×

3

4

5

6

7

8

9

Nk5

Nk6

Nk3

Nk8

Nk4

Nk9

Nk7

Nk1

Nk10

Nk2

n0

n1

n2

n3

n4

n5

n6

n7

n8

n9

n7n9

n1n3n5

Sony SOBAX 2500 CalculatorSection: KeyboardPage: 6 Rendition: 2014 May 7

NK2

Nk18

NkB

510

Ne41K1

8

1M6

9101211

12

3

1121

M2nQ

nPJ

nMnD

6

897

M1

4

10 M2

5

1M72

4

12

3

11

n8n9

n2n3n5

Ne39K2

7

2M6

6534

n7n8

n0n5n6

n8n9

n4n6n7

Ne37

8

1M8

12119

10

K4

n9

Ne35KW

10 of 510K10 of 0.068

+

–

2

÷

=

√

R

M

Min

Mout

NK11

NK10

NK16

NK15

NK6

NK12

NK7

NK8

NK17

NK14

nA

nS

nM

nD

nE

nQ

nR

nMS

nMI

nMO

nMC

nEnR

6

2M4

5473

Mc

S

D

J

NK4

NK3

NK9

NK13

nMC

nPS

nPD

nPJ

nPD

nAnS

nMS

8

1M4

12119

10

5

11

3

12

12M1

nRnMO

nAnD 4

10 M1

nMC

nSnMnMI

6

2M3

3475

nPS

nEnQ

nMS

11

1M3

98

1012

5

10

4 M5 5

11

3

1212

M5

6

987

M2

C6344.3K

0.22

nKFA

nKFB

nKFC

nKFD

<

Nk14

CS

Nk11

>

Nk15

9

6

1087

M7

nKDPNc38

Nb38

KSCSNb10

nKSRNb12

Nb14nKSL

6

987

M5Nd12

KCE

1K33

10V 15K

3310V 15K

1K

1K

LEARNAUTOMAN

CHECKOPER

READTOFF 33

10V 15KNk12

1K

ND27KTREAD

3

2M8

4567

NE38KTON

Nk13

NE28

510

0.068

3.9

NKS

NK18 Ne32

NF37

NA11

Nc34

nKCHECK

nKOPER

Nd31

NF41

Ne21

Ne30

nKLEARN

nKMAN

Nk17

NkS

Nk16nKAUTO

Ne6

Nd5nKMAO

Nd42

Nc41nKCA

u5/4d

Nb42nKRDWN to X register

NkA

NKUnKR54 to X register

NkP

NkR

Ne33

4

10 5D410Nd15 Ne16

nKSCS

Nd4

4

10 5D301 nKTREAD

107 69

8

E303nOVF

nKAUTO

CE20.068

10

4 5E401

nANEGnKSCS

nSH

NK5

DE2

nKPS to state registers

024

nØD0nØD2nØD4

KRØDNkE

Nb4

to F registerto N register

NK1

3.3K 120K

0.015

Backplane 1-539-225-11(Unit SN 620173)

Backplane 1-539-225-12(Unit SN 620175)

Sony SOBAX 2500 CalculatorSection: Control (part 1)


9

10

D103

8

7

J

K

Q

nQ

11C4

3

D103

5

6

J

K

Q

nQ

2C9

10

D102

8

7

J

K

Q

nQ

11C4

3

D102

5 J

K

Q

nQ

2 C

6

3 TD6 TD1

TD2

TD4 TD3

FAnFAFBnFBF CnFCFDnFD

nKFD

122

111 D405

TBnSJTT

6

789

D202

3

1122

11D403

6987

D403

9

10

D106

8

7

J

K

Q

nQ

11C4

3

D106

5

6

J

K

Q

nQ

2C9

10

D105

8

7

J

K

Q

nQ

11C4

3

D105

5 J

K

Q

nQ

2 C

6

3

TD13

TD11

nGAGBGCnGD

2

111

12D406

TD12

RDY

nKCA

10

4D109 5nTT

SC

4

3

5

6

2D114

J

K

Q

nQ

CØD15•B3

TD40

ND31 NC30

YB

TT

7

6

8

910

D416VB

UCE

1

212

11D208 3

VC

1

2

12

11D216 3nSC

UCEUC

SD

TPT C

ND32 NB319

10

8

7

11D114

J

K

Q

nQ

C

12TØB 1T 12T1 TØB ØB ØB


1TØB

12TØB

ØD15•B3

6

TD38NC32

789

D3166

7

89 D212

UCE

nSA

SESC

5

11

D41634

121

2

JAQ

TT

678

9

D415510

4D415

nGD

12

1211

D316 3

WUCEQ

nOVFUE

SCTPUC

nKFC nKFB nKFA

Nd36 Nb34

Ne38

8

1C208

9101112

nSA SANC28 NB27

SA

nSA

3

2C405

4567

SB nSBNC34 NB33

NE34

nSB

SB

4

10 5E402nAISNEG

EP

4

10

5E408SK

nSM

Ne34 Nd33

FEto J counter

6

789

B311nUCSC ND26

NB25

Ne3

CA

1

3

21112

E408SJ

nSM

NPRESSAFD

1

3

21211

D202

FBnFC

TA

67

89 D302

F C

FB

nFB

11

3

1211

D401nFCnFD

nFA

nFB1

3211

12

D402F CFDTA

FA

1 32

1112

D204nFCnTX

nFB

nTK

8

6

79

10D101

nFBFA

F CNd40 Nc39

4

10 D401 5

4

10 D204 5 ND13

6

789

D204

4

10 D402 5

6

789

D402TT

KT

Nd38 Nc37

4

10 D202 5 Nd22 Nb22

Nd34 Nc33

UA

UB

UC

nUC

UD

UE

UF

6

879

E411nFDnTQ UG

Nd39Nd37Nd35

Ne42

Nd41

NE29

KCE1

3211

12

D211nSJnSBnSC

4

10 D411 5

3

2D207

4567

Nd11 Nc11

Ne12

RDY

5

4

10 D316Q

UCE

UCEQ

1

3

11122

C403nSJ

nKOPER

Nc42 Ne40SM

UH

6

879

E404nKCHECKSL

nAISNEG

Ne4 Nd3UJ

TD35

UJDD5

DD4

4

3

5

6

2D112

J

K

Q

nQ

CØD15•B3

5

4

10 D412

UCEQ

TD34

3

2D116

4567

Nd2 Nb2

Nc1

Ne2

UFSB 6

789

D412

212

111 D412

UD

WGC

3nTF

SE

Nd27 Ne289

10

8

7

11D112

J

K

Q

nQ

CØD15•B3

5

10

4 D408TD33

nSF12

1211

D408 3

5

4

10 D407nTJnKLEARN 67

98 D407

5

10

4 D216

UCE

T C

DISNEG

SK

4

3

5

6

2D113

J

K

Q

nQ

CØD15•B3

TD3712

11

12D415 3

ND37 NC38

NE42

YC

5

10

4 D406nTF TG

51

D41434

12

112

T CTV

VAUCE

TS

111

2

12

D110 3

W

UD

nFD1

3

211

12 D302

SA

F CnFB

9

10

8

7

11D113

J

K

Q

nQ

C

1 TØB

12 TØB

1 TØB

12 TØB

ND39 NC40

TD36

ØD15•B3

212

111 D209

UCE

VBJA

3TF

TM

8

1D116

9101112

ND41 NB41

NC42

7

6

8

910

D104nFC

FBFA

nFD

GBnGA

10

4 5B310

3

2C208

4567

nSE SENC36 NB35

NE36

10

4 5B311

TB26SE

nSE

SE

nSE

8

1C405

9101112

nSC SCNc2 Nb1

nSC

SC

SD

nSD

nSDSD

6

789

E413 nSF

nKMAN

SF

12

3

2

111 C414

DDISZnTD

YCNC15 ND16nJ



4

10 D211 5Nd7 Nb8

6789

D211

TD39

Ne8

nSCnSDSE

4

10 D212 5Nd10 Nb11

Nc12

nSB

132

1112

D212

nSEnSD

SA

678

9

D216nSA

nSDnSC

ND44 NC43

NE41

1 3

2

11

12C408 10

4 C408 5

nSBnSA

nSESC

SE 1

3

21112

C411

6

7

89 C411

TC12

SBnSD

nSD6

7

89 C406

nSASB

6

987

C407

TC32

TA

T C

TG

nTG

nTC

TD

nTD

TE

nTE

TH

11

3122

1C404

SB

nSD

697

8

C408SD NC27 ND28

nSC

nSB

6

789

D410

TD20

nSC

TF

nTF

TB

NC37 ND38

DE19

SF 8

1C412

9101112

4

10C411 5SD

SB

NC29 ND30

TC27

TK

nTK

4

10 5E306nSJ

SM

1

3

21112

E401

TJ

4

10 D302 5

Nb18Ne18

Nd17

nTJ

5

2

D10434

12

111

nGD

W

6

789

D405

4

3

5

6

2D107

J

K

Q

nQ

CND20

NA18

NC19DISNEG

TD19

ØD15•B3

8

1D207

119

1012

TD18CHGSGN

4

10 D405 5T C

UCE

67

89 D408

nGAUD

4

10 D209 5TS

TF

1

3

21112

D413

SE

nTT

AISNEG

GB

Nd26 Nc259

10

8

7

11D107

J

K

Q

nQ

C

6

987

D208

ØD15•B3

Nd25 Nb372

3

11112

D205

TLTJ

Ne25

Nc23

6

798

D205

nTK

TN

4

10 D205 5

67

89 D115SC

DISNEG

X

TM

4

10 D208 5A

nTJ

678

9

D209V

UBnKMAO

TD14

nTF

nFC

7

68

9

10 D201FB

nFA

AISNEG

nAISNEG

Nd29 Nb309

10

8

7

11D108

J

K

Q

nQ

C

1 TØB

12 TØB

12 TØB

ØD15•B3

Nd28 Nb28

Nc27

6

978

D109UF

4

10 D110 5SE

JC

6

897

D110

2

3

12111

D109

TQF C

W

SC

SG

nSG

6

798

E401AISNEG nAISNEG

4

10 D403 5 ND42 NC41

10

4 C402 5

3 2C412

4

56

7

SEnSA

NC9 ND10

2

3111

12C409

6

987

C409

SE

nSB

SC

4

10 C409 5 Nc8 Nb7

nSD

1

3

21112

C4104

10 C214 5

6

789

C410SA TC17

SC

Nc19 Ne19

NC39 ND40

TT

nTT

TT

TW

nTV

TV

TU

1

3

122

11C407

SD Nc10 Nb9

NC35 ND36nSA

11

3

1212

C406

nSBSCSE 10

4 C407 5

TR

TQ

TS

nTR

10

4 5E404TA

1

311

122 E406

nSJnSK

6

789

E406

4

10 5E406

nTX

TXNe10 Nd9

Nb16 4

10 B404 5

nTK

TK



67

89 D315nSE

SC

nTKTP

4

10 D214 5 ND29 NE30

6789

D214nSCnSEnTK

Nd8 Nc7

10

4 D315 5

SC1 32

1112

D315SE

nTK

SA ND8 NC7

ND12 NC11

nSB

1

3211

12D214

nSA

nSCSE

TQ

nTQ

TL

TM

TN

ANEGJ to SL register

nKAUTO10

4

3

E104

5 J

K

Q

nQ

2 C

6

SJ

nSJ

TE11

Nb24Ne20

ØD15•B3

12

3

1112

E206

6789

E206SK

7

6

1098

E403

9

10

E104

8 J

K

Q

nQ

11 C

7

ØD15•B3

1

3

112

12E205

6

789

E205SK

nSK

5

12

E403423

11

1

nKCHECK

Nc21

Nd19

nSM

UCESM

6

789

E305

V

10

4 5E205

9

10

E105

8 J

K

Q

nQ

11 C

7

ØD15•B3

SM

nSM

4 5E305

nSJ

TE13

11

3

12

12E305

1

3

12112

E306VB

6

798

E306

10

4 5E206nKMAN nTX

4

3

E103

5 J

K

Q

nQ

2 C

6

SL

nSL

TE8

ØD15•B3

DE3

6

789

E204

TE7

1

3

21112

E204

UCE

Nc17Ne15

nSFnSL

AISNEG

UCESF

ND9NE10

TE10

TE9

10

4 5B203nSJ

SJNF29Nb25

TJ

nTJ

NPRESSA

6

789

D301FAFD

nFC

1

3

2

1112 D301

nKTREAD

nTJ

Nd21 Ne22

Ne11 9

6

1087

E203nOVF

9

10

E103

8 J

K

Q

nQ

11 C

7

ØD15•B3

5

2E20311

4

312

1

UCEUH

nKSCS

nOVF13

2

1112

E304

67

89 E304

4

10

5E304nTC

nKAUTO

nKAUTO

nSMSK

SEnSCnSB

nSH

TE6

Ne31 Nb33SH to V register

UJ

33KQF22QF21*C634A10

25V

4.7K 10K1025V 4

10 5F309

1

3

21112

F309

NF43

2.7K

QF24QF23*C634A

150V

NF421.5K

nKLEARN

nKCHECK

NE43

2 D201

3

411

12

1nFBnFC

nFA

nTJnSF

nAISNEG

5

Nd14

Ne17



1 TØB

12 TØB

12 TØB

1 T

12 TØB

ØB

Ne26

NF44

Nd1nKPS

nKTREAD

DD1

DD2

DD3

UB

nKSCS

4

10 5E204NPRESS

698

7

D406nTJFD

Nd23 Ne24ANEGJ

Sony SOBAX 2500 CalculatorSection: Q Counter & DP Counter


9

10

B110

8

7

J

K

Q

nQ

11C4

3

B110

5

6

J

K

Q

nQ

2C9

10

B109

8

7

J

K

Q

nQ

11C4

3

B109

5 J

K

Q

nQ

2 C11

3

1212

nØB3

B2106

6

987

B210

4

10 5B210

4

10 B209

6

978

B209

5

6

798

B206

6

987

B208

4

10 5B307

ØD15•B3

698

7B306

SJ

TB29

TB28

TB24

TB30

nTXnØDINS

QA to V register

TB23

9

10

B108

8

7

J

K

Q

nQ

11C4

3

B108

5

6

J

K

Q

nQ

2C9

10

B107

8

7

J

K

Q

nQ

11C4

3

B107

5 J

K

Q

nQ

2 C

6

6

897

B307

4

10 B208 5

4

10 5B206

TB22

TB20

TB15

TB14



TB13

TB18

TB19

TB16

TB17

1

3

11122

B307

12

3

12

11B308

6

897

B308

nBCD

AnCnD

BnC

D

DnDCnCBnBAnA

A

nB

nC

D

nA

2

3

11121

B208

BCD

nØD15

11

321

12

B205

ØD15•B3

23

12111 B206

nØD1511

3121

2

B306

ØD0

KSCSSA

nKSL

nKSR

ØB3nØDINS

10

4 5B306nKSR

nUNITØD

UNITØD

DP to display

12

3

11

12 B209

nINITP

ND19NB20

nSESD

Q to SB register and UCEQ logic

ND33NB39CHGSGN to DISNEG register

DB7

DB6

DB5

DB4

DB9

DB10 RB21K

dimming for thousands separators by reducing duty cycle

9

10

B103

8

7

J

K

Q

nQ

11C4

3

B103

5

6

J

K

Q

nQ

2C9

10

B102

8

7

J

K

Q

nQ

11C4

3

B102

5 J

K

Q

nQ

2 C

6

6

798

B202

4

10 B101 5

10

4 5B301

TB7

TB9

TB4

TB312

TØB 1T 12T1 TØB ØB ØB

TB8

TB6 TB5

1

3

21211

B203

6

897

B203C

nD

BCD

DnDCBnBnA

B

11

3

1212

B101

nAnBC

J to N register and D data switch

D

TB1

4

10 B202 5

nSJ

nD 10

4 B302 54

10 B403 5

4

10 B402 5

FE

SJ

1

3122

11B202 6

879

B101ØB3

54

B201

11

2123

1

ØD15nSCnTG

YAØB0

nØDINS7

6

1089

B201

2

3

1

1112 B301

6

789

B301

11

321

12B302

6

798

B302

5

3

B40142

12

11

1

INTØD

nSBnSE

DDISZ

10

678

9B401

TJ

SEnSC

SGDDISZ

nSD

nSGnØD15

SA

nSCnTG

nW

6

789

B403SD

DDISZINTØD

TB2

nJ to SE register and B and D data switches

Nb19 Nc20

nJ

10

4 C110 5 nJ

689

7

C403Nc40

Nb39nKOPER

SMUH

Sony SOBAX 2500 CalculatorSection: J Counter


RB11K

6

789

B405INTØDnKDP

nTC

10

4 B405 5

Nb15 Nc16

Ne13

1 32

1112

B404

TWSA

JA to SB and SD registersNb20 Nd20nDDISZ

JB to N register and D data switch

nSD6

97

8

B404Nb17 Nd18

SC JC to SG register and INTØD register

6

10

6

879

E212C

ØS13A

5

3E2101

12

11

2

4

9

6

78

10E210

B

ØS9

nC

ØS11

BnA

A

5

3E3101

4

12

11

2ØS10

nCnBA

5

11E3114

3

2

1

12

9

6

87

10E311

C

ØS14

C

ØS12

nBnA

B

51 E2094

23

11

12

SJ

ØS8

nCnBnA

52 E4071

411

3

12

SK

nCB

nA

9

10

E105

8

7

J

K

Q

nQ

11C4

3

E106

5 J

K

Q

nQ

2 C9

10

E106

8

7

J

K

Q

nQ

11 C4

3

E107

5 J

K

Q

nQ

2 C

62

312

111

E402

4

10 5E207

TE15

6

789

E207

2

3

11211

E207

nKMAOØD15•B3

V

ØB3nØD15

SJSM

1

3

21211

E307

4

10 5E307 6

798

E307

6

879

E308

TE17

TE16

6

789

E208

10

4 5E309

1

3

21112

E309

1

3

11122

E2084

10 5E208

TE18

4

3

E107

5

6

J

K

Q

nQ

2 C9

10

E108

8

7

J

K

Q

nQ

11 C4

3

E108

5 J

K

Q

nQ

2 C

6

AnA BnB CnC

TE19

TE20

TE21

TE22

687

9

E402

6

978

E309

10

4 5E414ØB3nKMAO

V

ØD15•B3SJSM

6

978

E414

AC

PA to E and EP data switches

NA12NE13P1ST to display

TE12

1 T 12 T 1 TØB ØB ØB

12T1 T12 T1 TØB ØB ØB ØB

7

6

89

10E209

B

A

nC

PEXP to displayNA14NE14

PØS to main registers

BnINITP

ProgramSlice Utilization Order:

First: ØS13 ØS11 ØS12 ØS14 ØS8

ØS10Last: ØS9

Sony SOBAX 2500 CalculatorSection: P Counter


UG

POVF to OVF register

678

9

D411

5

10

4 D413

RDY

KTREAD ND11 NE12

nKCA

67

89 D401

nAISNEG

nTJUB

DE14

DE12

RE21K

2

4

10 5E202

9

10

E101

8

7

J

K

Q

nQ

11 C4

3

E101

5

6

J

K

Q

nQ

2 C9

10

E102

8

7

J

K

Q

nQ

11 C4

3

E102

5 J

K

Q

nQ

2 C

6

TE1

1

3

11122

E201

6

987

E201

10

4 5E201

KW

K4

K2

K1

6

789

E202

CE10.068

11

3

1212

E202

1

31112

E301

TE2 TE3

TE5

10

6

987

E302

10

4 5E301

6

789

E301

5

12

E3034

13

112

nSMnSK

JBUCEnSB

511 E3023

24

12

1

AISNEG

TE4

nOVF

SM

nTV

nSC

NPRESS to SH register

UJ

nKSCS

ØD0

12 T 1 T 12 T 1 TØB ØB ØB ØB

Nc32Ne29N to A, D and E data switches, M register and OVF register

nN to E data switch

Sony SOBAX 2500 CalculatorSection: N Register


2

3

111

12C401

nSB

6

879

C402nTT

ACOMPnØD15

A

12

3

21

11C402

10

4 C401 5

TT

D

nTE

UCTW

TA

Nc35

Ne36

D

6

789

C401nTVØD0ØB0

1

32

11

12

B402

YA

nAISNEGJ

W Nb36 Ne27

nSH

EP

DE1

1

32

1211 E404

nKCHECKnAISNEG

NPRESSA to SB, SJ, SK, and SM registers

12124

11

nCD

B

32

114

12

nB

nD

A

111224

7109

C

BnD

nA

nD

4321

11

CD

nBnA

9

10

12T 1 T 12 T 1 TØB ØB ØB ØB

4

10 5E215 9

10

E115

8

7

J

K

Q

nQ

11 C4

3

E115

5

6

J

K

Q

nQ

2 C9

10

E116

8

7

J

K

Q

nQ

11 C4

3

E116

5 J

K

Q

nQ

2 C

6

nDD C nC B nB A nA

TE45

1

3

122

11

E215

6

798

E215

4

10 5E216

TE47

TE46

5E212

3ØS9

5E213

1

10

6

78 E213

B

ØS6

ØS4

nD

5E312

13

8

6E312

ØS7

ØS5

5E313

12

8

6

97 E313

nB

ØS10

ØS8

C10

4 5E4166E416

nA

B

C

D

nINITP

6

789

E216nTXØD15

10

1E314

111298

nDnCnB

nØD15nKCHECK

NA20NE16MEM1 to display

789

AnSJ

12 311

21

E216nSF

AISNEG

SLnTJ

SKN

TE43

Memory Slice Assignment:

Mem Slice1 ØS62 ØS73 ØS44 ØS55 ØS96 ØS107 ØS8

Sony SOBAX 2500 CalculatorSection: M Register


M to X register

MØS to main registers

RE31K

DE17

DE16

DE15

DE18

0x11

x101

01xx

0x01

0x10

101x

1100

N4

13

212

11

C108

6987

C108

511

C107

342

12

1

8

6

79

10C109

4

10C108 5

5

4

C1093

1112

12

1

32

11

12

C207

7 6

89

10C209

5

11

C20912431

2

Nc14NF39 nDIN

ØB03

TM

SA

DUCE

JnAISNEG

OVF

nTE

X

nJnV

UCE

AISNEGØD0

WnSCnTG

UH

TETU

D

4

10 C106 5UH

4

10 C207 5

7

6

89

10C107

10

4 C415 513

212

11

C415nØD15DDISZ

nSC

ØB3

68

9

C110TK

7nSCJB

D

NC31 NF31BIN

1

3

122

11C213

6

987

C213

nTD

10

4 C213 5

12

3

21

11C214

6

789

C214

TK

nKCAB

nSC

TW

YTD

A

nØD15B

ØD15

NC25 NF30AIN

1

3212

11

C112

6

897

C112

X

10 C212 5

2

3

11211

C212

6

987

C212

A

nSCnKCA

nTD

TE

NnTE

TD

2

3

11211

C113

6

879

C113

Y

SC

nTV

4

10 C113 5

B

6

789

C404DDISZnSG

4

10 C404 5

nSA

nINTØD

TC34

AnØD15

4

10 C112 54

10 C406 5

6

789

C416

4

10 C416 5

6

987

C415

nAISNEG

A

6

987

C413

10

4 C413 54

10 C414 5

DISNEG

nD

6

7

89 C207

nSAnSBnSC TU

SE

SBnSC

N

ACOMP

DCOMP

SA

TD

TFTB

Sony SOBAX 2500 CalculatorSection: Main Register (A,B,C,D,E) Data Switches


NF34CIN

12

3

1112

E413

12311

12

E414

12

3

11

12 E415

NE33

4

10 5E413

nSEnFD

ØS5X

ØS0C

KTON

nTQUG

nTQ

4

10 5E411

1

32

1112

E411

10

4 5E410

6

987

E410

698

7E409

1

312

112 E410

nFA

ØB3SF

nFAX

NF40NE39EIN

PA nN

nSF

1

3

2

1112 E409

SKSJ

4

10 5E409NF27Ne7

EIN_ENBUG

nJ

96

107

8

B406YA

5

11

B40631

212

4

UNITØDØB3

nSCnW

nTG

nTC

D

INTØD

RB31K

Nb13

231

1112

B405

DnINTØD

nJ

10

4 5E30812

1

3112

E308

RE11KE

nSKPA

RE41K

EP to N and F registers

SM

f2

f6

TF38

Sony SOBAX 2500 CalculatorSection: Main Registers (A,B,C,D,E)


75

0.022C403A

8.2K

510

51K3K

510

C403A

3.3K

2.2K

116V

11K

8.2K

1016V

1016V

910

116V

390pF

7

8

9

ACOUSTIC DELAY LINE

1

2

4

3

5

red

green

QF27QF24*C641

820

5.6K6.2K*

30pF820

QF26QF27*C641

QF30QF31*C641

1.2K

560510*

560510*

5.6K6.2K*

30pF820

7.5K 82pF

QF21QF22*C641

4.7K4.3K*

1K

91pFØ

1

2.4K

QF2C403A

39K

30K

0.0022

68

1.5K 125V

2.4K

QF4C403A

20K

15K

0.0022

2.7K1.5K

0.0022

220

QF5C403A

100

220 0.0022

2703.3K

0.0022

4716V0.068

9

10

F405

8

7

J

K

Q

nQ

11 C

RDY

9

10

F404

8

7

J

K

Q

nQ

11 C

8

1F304

9101112

2

3

12111

F303

6

897

F3039

10

F302

8

7

J

K

Q

nQ

11 C4

3

F302

5

6

J

K

Q

nQ

2 C

9

10

F407

8

7

J

K

Q

nQ

11 C4

3

F407

5 J

K

Q

nQ

2 C

6

4

3

F404

5 J

K

Q

nQ

2 C

ØS1

f26

NF21

f21

f28

f7

f24

NF36Ø

f36

f34

6

A

f25

TF44

TF36

TF11

TF6

f42

f40

820820

5.6K

20pF 20pF

QF6C641

5.6K

4.7K

1K

4.7K

1KQF3C641

820

2.2K

1.5K

Ø

QF8C641

91pF

TF9TF10

91pF

9

F310

1011128

1

3122

11F410

6798

F410ØS1

4

10 5F410

1

3

2

1112

F411

678

9F411

ØS4

ØS5

11

3

21

12F412

6

879

F412

RDY

ØS2

10

4

5F412ØS3

f1

10

4 5F411nDIN

BIN

AIN

1K

EIN

nØB

9

10

F409

8

7

J

K

Q

nQ

11 C4

3

F409

5

6

J

K

Q

nQ

2 CEIN_ENB

f4

ØS14

PWROFFPfrom timing

NC17

ND18

NkD

CIN

ØD0

ØB0NE35

C

4

3

F405

5

6

J

K

Q

nQ

2 CØS2

f18

NF35D

Nb5

Nc6

9

10

F406

8

7

J

K

Q

nQ

11 CØS3

f16

NF33B

Nb6

Nc3

4

3

F406

5

6

J

K

Q

nQ

2 C

f23

NF38E

ND35

NE37

QF7C641

MSYNC to AFC in timing

4

10 C115 5 nD

B register

D registerdata being displayed,

unblanked 0’s mapped to 1000

A register

C register

E registers11 registers for memorys 1 to 7

and program instructions

4

3

F408

5

6

J

K

Q

nQ

2 C

12 T12 T

12 T 1 T

12 T 1 T

1 TØ

Ø Ø

Ø Ø

Ø

12 T 1 TØ Ø

1 TØ

12 TØ

1TØ

1 TØ

ØS2

ØS2ØB0

NF28NE2772E314

65

43

from P counter PØS

from M register MØS

9

10

F302

8

7

J

K

Q

nQ

4

3

F302

5

6

J

K

Q

nQ

Ø

f42

f40

12 1Ø

Substitute using 7400 series

T

T1

3

Sony SOBAX 2500 CalculatorSection: X Register


5

4B312

1211

12

3

YA

nTRSA

nRNDØD

4

3

B114

5 J

K

Q

nQ6

9

10

B115

8 J

K

Q

nQ

C

7

9

10

B116

8 J

K

Q

nQ7

4

10 5B215 6

897

B213

6

879

B212

6

987

B214

4

10 5B2126

987

B215

1

3

21112

B216

1

3

11122

B213

4

10 5B214

TB38

TB40

TB42

TB41

TB45

TB46

nX4 X4nXW XW nX2 X2 nX1 X1

4

3

B115

5 J

K

Q

nQ6

TB43

TB44

11 3

1

2

12

B212

11 3

1

12

2

B214

4

3

B116

5 J

K

Q

nQ

2 C

6TB47

X4

nX4

1

3

21112

B215

10

4 5B216

6

789

B2165

11

B31332

1

4

12

nKRDWNnINTØD

nYR54

1

31112

2B310

ØD15

9

10

B114

8 J

K

Q

nQ7

2 C1111 C

2 C

11 C

TB324

10 5B113

6

879

B113

689

7

B112

12

3

12

11B113

4

10 5B112

789

10B313

10

4 5B211

6

987

B211X1

XW

nX1

6

121121

B112

1112

2

1B211 3

6

987

B111nX2

1211

12

B111 3

10

4 5B111X2

X1

nX1

ØB0

NC18NB17

ND17

NE18

NC10NB9

TB34

ØB0

ØB0

NC24NB23

INA

6

9

87 C414ØB0

NC14

NB13

ØD0

TH

nTG

INB

X to AISNEG register and A, C, D and E data switches

XOVF to OVF register

CA to SB register and Y register

nCA to Y register

1 TØB12ØB12 TØB

1 TØB

ØB

12 TØB

Nc13nKR54

NB14

X

nX

X

nX

nX X

nB4

nB4

B4

B4B4

nB4

nB4

B4

7

6

89

10C215

5

11C215

124

3

12

nSB

A

SC

1

3

21211

C114

TTnTK

NC12

NB11

ACOMP

nØD15

6

879

C115nTE

SD

nSA

TE

TR

nSC

ØB0

TN

ØD0

6

978

C114

12

3

12

11C115

SE

WA

2

3

11211

C216nW

B

4

10 C114 5UA

9610

78

B312

B

nTRSA

nRNDØDINB

ND34NC33

2 D1014

113

121E

nFB

nTK

nFA

F C5

NE32

4

10 5E415

6

7

98 E415

C

KTREAD

nTQUG

3

nD

8

67

109 C211

5

11

C2111

412

2

ØD15

nSEnTK

SA

7

689

10

C210

54 C21012

113

1

2

VA

nTG

Y

DDISZ

23

112

11

C11167

89 C111

10

4 C111 5

D

nSD

TH

UA

2

3112

11C110

SE

UFnSC

ØD15

ØD15

nSA

SCnSB

4

10 C410 5TU

DCOMP

7

6

8109

E310

nKCHECK

M

Nb3

Ne1

nTXØD15

Nc4

INA

DCOMP

nSE

Y

TC9

Sony SOBAX 2500 CalculatorSection: Y Register


9

10

C103

8

7

J

K

Q

nQ

11

C

4

3

C101

5

6

J

K

Q

nQ

2CC102

J

K

Q

nQ

C4

3

C102

5 J

K

Q

nQ

2 C

6

TC7

TC6

TC2

6

987

C106nCnBnA

AnABCnC1

3

122

11C202

CA

TC5

9 68

710

C205

6

987

C201

CA

52 C2053

1112

4

1

ØD15

SASB

ØB0TH

7

6

9

810 C206

6

798

C105

12

3

1112

C105

6

879

C104

5

2

C20634

11

12

1

NC13 ND14

TC4

nB

2

3

12111

C204

4

10 C203 5

TC10

4

3

5

6

2

1

3

122

11

C203

9

10

8

7

11C101

J

K

Q

nQ

C12

TØB

1T T1 TØB ØB ØB

1

12 TØB

nYR54 to X register

1

3

21211

C201CB

ØB0

10

4 C201 5

6

789

C204nSBnSCnSD

nSE

nØD15

nØD15

nØD15

ØD15

TM

TN

nTT

DCOMP

10

4 C105 5nTD

1

3

21211

C104

B

B

nSB

TWTT

1

3

11122

C106

TC14

SA

6

897

C202TH

Nc26

YB to SA registerND25

nKDP

TC1

SC

TC3

4

10 C104 5

B

nTD

ACOMP

Y to B data switch, X register and OVF latch

Nc36 Nb35YA to J counter, N register, D data switch and X register

YC to SE register

6

987

E408SJ

nSM

NE26

nDDISZ

1

32

1112

B311nSB

nSESC

NB24nCA

Sony SOBAX 2500 CalculatorSection: Misc. Registers


Nb27 Nc28

4

3

5

6

2B104

J

K

Q

nQ

C

4

10 B205 5

1

3

122

11B403

ØB3

ØD15•B3

6

789

B402nSCUNITØD

nSD

6

879

B205SDSC

10

4 B305 5KRØD

INTØD to J counter and display

nINTØD to B and D data switches and X register

TB10

1

3211

12B305

SEnSD

SG

UNITØD

9

10

8

7

11B105

J

K

Q

nQ

C12 TØB

678

9

B305SC

nSC

ØB3

D

nØB3

DB2

DB3

nSESD

Nb29 Nc30

1

32

1211

B304

6789

B304

5

2B303

124

3

111

ØB3

nUC

nSD

SHØD15•B3

ØD15•B3SC

4

10 B304 5

6

789

B204QA

2

3

11211

B204

nSCSE

9

10

8

7

11B104

J

K

Q

nQ

C

10

4 B204 5

nUNITØD

KRØD

nSB

7

698

10B303

ØB3

SB

Nb26

Ne23

Nd24

Nb23 Nc24

nINITP

V to SJ, SK, SM and AISNEG registers and P counter

nV to D data switch

nSD

nSDSB

nTX

nRNDØD to X register

Nd32 Nb314

3

5

6

2D108

J

K

Q

nQ

CnKSCS

Nd30 Nb32

Nc29

5nTFSG

678

9D111

2

12111 D111

SASD

GB

Nc31

4

10 D111

3UE

T C

TM

W to SB, SC, SE, SG, DISNEG registers, N register, X register and D data switch

nW to J counter and X register

1

3212

11

C413

nTK

ØB0ØD15

1

3

21211

C416ØD15

nDDISZ

Y

nVC

XOVF 10

4 C204 59

10

8

7

11C103

J

K

Q

nQ

C

1 TØB

12 TØB

1 TØB

12 TØB

6

789

C203UCE

TC11

TC8NC44

ND43

NA32nOVF to SB and SH registers, N counter and display

OVF to D data switch

NE44

nUC

2

31

1112 D407

TM

DISNEG

UC1

3

21112 D411

nGD

AnVC

Nd6

Ne9Nc5

10

6

9

87 E407

ØD15nTC

N

POVF

nDDISZ to J counter

DDISZ to SE register, J counter, B and D data switches and X register

Nb21 Nc22

1

3

21211

D410

KSCSNd13 Ne14

4

10 D115 5 Nd16 Nc15

nSB

1

32

1112 D115

SE

SA

7

689

10D414

UC

ND24 NC23nSDnSB

VA to SE register and X register

VB to SA, SD and SJ registers

VC to SA register

nVC to OVF register

V

JC

2SC926

DIGIT 1 (LSD)

Sony SOBAX 2500 CalculatorSection: Display


0

1

2

3

4

5

6

7

8

9

.

C926

100K

3.9K

51K

— (negative)

DIGITS 2 to 15

12 of C92612 of

3.9K

10 of 75K

4.3K?W

DP

1M

C9263.9K

51K

Pexp

PEXP

1M

C9263.9K

51K

OVERFLOW1M

6

798

A111nOVF

J1M

DISNEG

Digit Fct Lamp1 J2 mult3 ÷4 +5 R6 √7 –8 Mout9 =10 D11 Mc12 M13 Min14 S

2SC926510

ØD02K 1M

2750K

33K

1160V

3750K

33K

1160V

4750K

33K

1160V

5750K

33K

1160V

6750K

33K

1160V

7750K

33K

1160V

12K1W

V+130

27K1W

300K

RDY

P1stC634

510

1

B1361K

MEM1

P1ST

4

10 5B413

1

3

12112

B413

nW

12

4

10 5B411

NA43

1

3

12112

B410

6

798

B410124 6

897

B310NB44

4

n12

10

4 5A111

NA38NB42

NA37NB38

6

789

B4111

4n2

4

10 5B410NA39NB40

1

3

11122

B411

W4

n2n1

4

10 5B412

1

3

112

12B412

n4W

2NA35NB36

67

89 B413

nW

4

6

789

B412

NA31NB32

NA33NB34

4

10 5B414

1

3

21112

B414n1

nW2 NA29NB30

6

879

B414n2nW

110

4 5B415NA27NB28

6

897

B415W

n1 6

879

B416n4

NA25NB26

nØD0

10

4 5B416NA16NB163B415

n4

1

W

n2

2

3

11121

B416

n1

n4n2

nW

1

4

3

B314

5 J

K

Q

nQ

2 C

T6

2

n2

12

9

10

B314

8 J

K

Q

nQ

11 C

T7

1

n1

1

4

3

B315

5 J

K

Q

nQ

2 C

T6

ØB

ØB3

W

nW

12

9

10

B315

8 J

K

Q

nQ

11 C

T7

4

n4

XW

nXW

X4

nX4

X2

nX2

X1

nX1

nTX

1212

11

ØB

ØB3

ØB

ØB3

ØB

ØB3

NA15

NB12

nKCHECK

INTØD

ØD12.2K

DB8

HitachiCD81

V+130 V+130 V+130

V+200

V+130

V+200

V+130

red

Sony SOBAX 2500 CalculatorSection: Power Supply & Unused Gates


117VAC32W

POWERorange

white

2200016V

F10.8 A

blue

blue

F23.15 A

2SD28

2SD88A

10450V

200VAC

10K?W

8VAC

red

C867

C634

1350V 1.5K

200K

6.2K

150K

VR22K

200K

C634C634

0.047

47K?W

C756

51K?W

3K1W

24K

5150V

2K

7.5K

VR11K

C634

10025V

10016V

2K 2206.3V 0.15

LA

+4V

100025V

brown

F30.35 A 2SD28

15VAC

4.3K 1016V

V–101016V

2K

brown

0.0022

150V

2.4K

NA1

NA2

NA7,8

NA3,4

NF9

NA5,6

NB1,2,b43

NF1,2,11,13

4710V

NB3,4,b43

4710V

4710V

4710V

NE3,4,e43

4710V

NF3,4,7

3 of 4716V

POWER

0.068

4716V 0.068

0.068

NKP,R

NKA,B,C

NC3,4,c43

ND3,4,d43

NC1,2,c43

ND1,2,d43

NE1,2,e43

12

1112

E416 3

4

10 B213 5

UNUSED GATES

4

10 C202 5C103-4

4

10 C403 5

6

789

D413

allICs

13

14

V+200

501

(625KHz) Ø

Timing Signals IC Pinouts

ØS0

0µS 8

ØD-C

ØD-B

ØD-D

100 200 300 400 500 6400µS 1400130012001100780 820 960 1000 1500 0

(39KHz) ØB

100

1 2 5 10 4 9 3 6 13 11 7 15 14 12 8 0ØD-A

ØB

ØB3

ØS1

Sony SOBAX 2500 CalculatorSection: Timing Diagram, Bit Codes & IC Pinouts


502

503

504

+4VGND

+4VGND

0

(610 Hz) ØD0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 015 0

ØD-AK

1.6 3.2 4.8 6.4 9.6 11.2 12.8 14.4 16.0 17.6 19.2 20.8 22.4 24 25.6

ØS2

ØS3

ØS14

ØS15+4VGND

(9.8KHz) ØB0 0 1 2 3

+4VGND

nQa

Qa

Ka

Ja

TaCa

Ja KaQanQaCaTa

Jb

Kb

QbnQbCbTb

nQb

Qb

Kb

Jb

TbCb

ØB03

ØD-AJ

UNITØDwith 4 decimal places

INTØDwith 4 decimal places

14 13 12 11 10 9 8

1 2 3 4 5 6 7

14 13 12 11 10 9 8

1 2 3 4 5 6 7

14 13 12 11 10 9 8

1 2 3 4 5 6 7

14 13 12 11 10 9 8

1 2 3 4 5 6 7

IC technology inferred to be DTL inputs with open-collector outputs.

Inferred for 504 flip-flops: C = Capture Input T = Toggle (Clock) InputThe J/K state is captured when C is HIGH and T is LOW. Q and Q are set in accordance with the captured state when T goes HIGH.

Numera l W421blank 0000

0 10001 00012 00103 00114 01005 10116 11007 11018 11109 1111

function 1001

Bit Codes

Note: The W bit has a weight (value) of 2.

Funct ion D C B A+ 1110– 0110× 0111÷ 1111= 1001√ 1011R 1101M 1010

M IN 0100M OUT 1100M CLR 0101

S 1000D 0010J 0011

null 0000

Note: Frequencies shown are approximate, may vary with unit and temperature.

b c d eGND 44 43 V+4 V+4 44 43 GND GND 44 43 V+4 V+4 44 43 GND

nKRDWN 42 41 – UH 42 41 nKCA nKCA 42 41 nKFA nKFA 42 41 K1– 40 39 c40 b39 40 39 UA UA 40 39 nKFB UH 40 39 K2

nKDP 38 37 nAISNEG nKDP 38 37 UF UF 38 37 nKFC FE 38 37 K4e27 36 35 Y A YA 36 35 e36 FE 36 35 nKFD c35 36 35 K WFE 34 33 SH nKOPER 34 33 UC UC 34 33 e34 d33 34 33 keyboard

nW 32 31 W N 32 31 W W 32 31 nKLEARN nKCHECK 32 31 SHSG 30 29 DDISZ DDISZ 30 29 nW nW 30 29 SG nKMAN 30 29 N

nSG 28 27 nDDISZ nDDISZ 28 27 nSG nSG 28 27 SF SF 28 27 b36V 26 25 SJ YB 26 25 AISNEG AISNEG 26 25 nAISNEG F44 26 25 AISNEG

nSJ 24 23 nV nV 24 23 nAISNEG V 24 23 e24 d23 24 23 VnUC 22 21 nINTØD nINTØD 22 21 nSJ nUC 22 21 e22 d21 22 21 nKAUTO

JA 20 19 nJ nJ 20 19 nTV JA 20 19 nSJ nSJ 20 19 nTVTJ 18 17 JC – 18 17 S M JC 18 17 TJ TJ 18 17 d14

nTX 16 15 JB JB 16 15 nVC nVC 16 15 nKSCS nKSCS 16 15 S MnKSL 14 13 nD nD 14 13 nYR54 e17 14 13 VB V B 14 13 JBnKSR 12 11 nTG nTG 12 11 UCE KCE 12 11 UCE UCE 12 11 F42

KSCS 10 9 nTR nTR 10 9 – nTG 10 9 nTX nTX 10 9 d6, c5nTC 8 7 TW TW 8 7 TQ TQ 8 7 nTC nTC 8 7 EIN_ENB

MBR 6 5 MDR D 6 5 e9 e9 6 5 nKMAO nKMAO 6 5 –KRØD 4 3 X INA X INA 4 3 B KSCS 4 3 UJ UJ 4 3 D26

nSC 2 1 S C S C 2 1 nSC nSC 2 1 F44 nSC 2 1 X INAA B C D E F

nØD0 44 43 9 9 44 43 ØD0 nOVF 44 43 TA TA 44 43 nOVF nOVF 44 43 F43 d1, e26 44 43 E43nØD2 42 41 – n8 42 41 nSD nSD 42 41 nTT nTT 42 41 nSD nSE 42 41 TA e11 42 41 nKLEARNnØD4 40 39 7 7 40 39 CHGSGN SD 40 39 TU TU 40 39 SD nØD0 40 39 EIN EIN 40 39 nDIN

n8 38 37 6 6 38 37 nØD11 nSE 38 37 TF TF 38 37 nSE KTON 38 37 E E 38 37 nKCHECKnØD11 36 35 5 5 36 35 SE S E 36 35 TS TS 36 35 E SE 36 35 C C 36 35 D

– 34 33 4 4 34 33 nSB nSB 34 33 E32 E32 34 33 CHGSGN nSB 34 33 CIN CIN 34 33 BnOVF 32 31 3 3 32 31 S B S B 32 31 BIN SB 32 31 nSA C33, D34 32 31 ØD0 ØD0 32 31 BIN

– 30 29 2 2 30 29 nØD0 nSA 30 29 nTK nTK 30 29 nTQ nTQ 30 29 nKFD AIN 30 29 SJ– 28 27 1 1 28 27 S A SA 28 27 TB TB 28 27 KTREAD KTREAD 28 27 E ØS E ØS 28 27 EIN_ENB– 26 25 0 0 26 25 D26 ØD0 26 25 AIN e3, B25 26 25 Y B YB 26 25 F26 E25 26 25 pwr off

ØB3 24 23 – YB 24 23 CA C A 24 23 V A VA 24 23 – nØD15 24 23 ØS5 ØS5 24 23 pwr offnØD15 22 21 – nØD15 22 21 ØD15 ØD15 22 21 nØD15 – 22 21 RDY ØB3 22 21 ØS10 ØS10 22 21 AMEM1 20 19 – Q 20 19 ØB3 ØB3 20 19 DISNEG DISNEG 20 19 Q ØD15 20 19 ØS14 ØS14 20 19 ØB3

DISNEG 18 17 nØDINS nØDINS 18 17 X X 18 17 A MAR 18 17 X X 18 17 ØS0 ØS0 18 17 ØD15•B3funct ind. 16 15 DP funct ind. 16 15 ØB0 ØB0 16 15 D16 C15 16 15 – MEM1 16 15 ØS4 RDY 16 15 ØS4

PEXP 14 13 RDY nYR54 14 13 C14 B13 14 13 YC Y C 14 13 – (UE) PEXP 14 13 P1ST ØB0 14 13 GNDP1ST 12 11 nKCHECK DP 12 11 X INB X INB 12 11 TN TN 12 11 E12 D11 12 11 nINITP nINITP 12 11 GND

ØB 10 9 ØB nINITP 10 9 XOVF XOVF 10 9 TT TT 10 9 SK SK 10 9 Ø Ø 10 9 V–10V+4 8 7 V+4 ØD15•B3 8 7 nØB3 nØB3 8 7 TM T M 8 7 ØD15•B3 ØD15•B3 8 7 Ø Ø 8 7 V+4

GND 6 5 GND ØB 6 5 ØB ØB 6 5 ØB ØB 6 5 ØB ØB 6 5 ØB ØB 6 5 ØBV+8 unreg 4 3 V+8 unreg V+4 4 3 V+4 V+4 4 3 V+4 V+4 4 3 V+4 V+4 4 3 V+4 V+4 4 3 V+4

V+200 2 1 V+130 GND 2 1 GND GND 2 1 GND GND 2 1 GND GND 2 1 GND GND 2 1 GND

SonySOBAX 2500 Calculator

Section: Connectors Page: 24 Rendition: 2014 May 7Notes:• Italicised expressions are connections with no signal name in the schematic.

• Bold-faced expressions are signal sources.

Documents

Sony SOBAX 2500 Calculator - Madrona