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Contents   

Section

Page

Title & Contents (this page)

1

Notes & Signal Names

2

Block  Diagram

3

Timing

4

Keyboard and OP Flag

5

Control  (part  1)

6

Control  (part  2)

7

Registers

8

Decimal Point Register & Q Flag

9

Arithmetic

10

Display Latch & Display

11

Power  Supply

12

Timing  Diagram

13

IC Pinouts & Physical Layout

14

Connectors

15

Facit 1123

Calculator

Facit  1123  Calculator

Section: Title and Contents

 Page: 1

Rendition: 2014 Mar 6

This schematic has been derived through the reverse 
engineering of a Facit 1123 calculator.
This is not the manufacter’s schematic, nor is it 
based on the manufacturer’s schematic.

Содержание 1123

Страница 1: ...Arithmetic 10 Display Latch Display 11 Power Supply 12 Timing Diagram 13 IC Pinouts Physical Layout 14 Connectors 15 Facit 1123 Calculator Facit 1123 Calculator Section Title and Contents Page 1 Rend...

Страница 2: ...ng Master timing Master clock from which all timing is derived This is the basic bit rate B Bit timing D0 D15 Digit Timing 16 digit intervals D2 D15 are the displayed digit time periods Registers do n...

Страница 3: ...c Control 14 Nixie Displays Keyboard 43210987654321 Y Register 60 bits Decimal Point Register 4 bits decoder p Bx bit timing Dx digit timing Timing OP clock rate selection Display Latch 4 bits VCC log...

Страница 4: ...IC161 5 4 3 N108 n D0 n1 n2 n4 n8 1 n2 n4 n8 n1 2 n4 n8 1 2 n4 n8 n1 n2 4 n8 1 n2 4 n8 n1 2 4 n8 1 2 4 n8 n1 n2 n4 8 1 n2 n4 8 n1 2 n4 8 1 2 n4 8 n1 n2 4 8 1 n2 4 8 n1 2 4 8 1 2 4 8 9 12 4 5 3 2 1 n1...

Страница 5: ...25 S11 nQ nKCLR nD nZS nRC nZC nM to X Register NK10 NK36 NK43 NK45 nP0 NK18 M M MR MC 12 IC246 9 10 11 B24 B48 12 11 IC245 13 13 p 5 6 IC236 4 9 8 IC236 10 2 3 1 IC236 11 12 IC236 13 N249 OP B1p D0 5...

Страница 6: ...nQ n S30 Q n S11 N nQ a d n S23 M 11 IC365 6 4 5 8 3 2 1 12 CSCC n S30 Q n S31 nQ n S33 M Q n S32 M Q n S33 D Q n S31 Q N340 N239 11 13 IC375 10 12 9 e b nKCLR CYS16 N339 N241 N269 N368 N266 10 5 6 4...

Страница 7: ...31 1 11 12 IC331 13 8 9 IC331 10 1 n1 2 n1 n2 1 n2 n1 2 1 2 n2 IC312 12 11 13 3 2 9 8 3 2 IC322 IC322 6 IC312 9 10 8 4 5 1 6 5 4 12 11 IC322 IC322 11 12 IC321 13 2 3 IC321 1 8 9 IC321 10 5 6 IC321 4 1...

Страница 8: ...C232 5 6 IC221 4 3 2 IC221 1 11 12 IC221 13 9 8 IC247 10 9 11 12 IC269 13 8 IC269 10 11 12 IC228 IC227 IC226 IC225 IC224 IC223 IC222 13 9 9 9 9 9 9 9 12 11 1 nDL2 nDL4 OP n D15 nD0 3 2 4 IC258 OP 1 2...

Страница 9: ...play decimal points N347 N105 N107 N109 N115 N113 N111 N103 DPNE to Q Flag DPGT to Q Flag to Q Flag DPR to X Register Arithmetic nDP2 nDP3 nDP4 nDP5 nDP6 nDP0 nDP1 NK13 NK12 NK20 IC387 4 5 3 2 6 12 11...

Страница 10: ...15 N352 D15 13 10 11 12 IC359 N343 N245 1 2 3 IC360 4 5 6 IC360 N346 N247 10 9 8 IC360 X X CAD15 CS10S1 CAX CBY CAY CSCC CSTC CBX CBD CA15 nX1 ASUM10 to X Z DP Registers nX4 nX8 CSCC nX1 1 10 9 IC264...

Страница 11: ...P3 nDP4 nDP5 nDP6 B1 V a2 V a2 V a2 V a2 V a2 V a2 V a2 V a2 Facit 1123 Calculator Section Display Latch Display Page 11 Rendition 2014 Mar 6 nDL4 6 5 11 12 13 N119 20K IC111 100pF N220 8 9 10 11 12 1...

Страница 12: ...64 365 374 376 383 384 385 121 122 131 132 141 151 161 162 246 273 315 319 329 333 342 352 358 375 386 368 388 M5330 7 14 231 237 241 242 243 258 316 323 335 341 351 353 359 361 377 378 380 M5340 7 14...

Страница 13: ...480 520 560 600 640 0 S Dn DISP 40 KHz nDISP 100 KHz DISP 625 Hz nDISP 1563 Hz D0 15 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 one full number cycle in registers Digit held in display latch after B1p 14...

Страница 14: ...cc 5V 0V GND M5320 M5310 M5373 J K K J nQ Q Q nQ nC nC Vcc 5V 0V GND M5304 M5352 M5391 Vcc 5V 0V GND Vcc 5V 0V GND Vcc 5V 0V GND Vcc 5V 0V GND Vcc 5V 0V GND D Q 14 13 12 11 10 9 8 1 2 3 4 5 6 7 14 13...

Страница 15: ...P 37 38 Z 37 38 CSTC CSTC 37 38 Z nDL8 39 40 CYS16 39 40 CSCC CSCC 39 40 nDL8 nDL4 41 42 NR remote NR remote NR remote X ENB 41 42 nOP D14p CYS16 41 42 nDL4 GND 43 44 GND 1 key 1 17 nMANUAL 30 key DP...

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