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Facit 1123 Calculator
Section: Title and Contents
Page: 1
Rendition: 2020 Oct 9
Facit 1123
Calculator
Contents
Section
Title & Contents (this page)
Notes & Signal Names
Block Diagram
Timing
Keyboard and OP Flag
Control (part 1)
Control (part 2)
Registers
Decimal Point Register & Q Flag
Arithmetic
Display Latch & Display
Power Supply
Timing Diagram
IC Pinouts & Physical Layout
Connectors
Page
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
This schematic has been derived through
reverse engineering.
This is not the manufacter's schematic, nor
is it based on the manufacturer's schematic.
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Summary of Contents for Facit 1123
- Page 1 Arithmetic Display Latch & Display Power Supply Timing Diagram IC Pinouts & Physical Layout Connectors Facit 1123 Calculator This schematic has been derived through reverse engineering. Section: Title and Contents This is not the manufacter’s schematic, nor Page: 1 Rendition: 2020 Oct 9...
- Page 2 F is used to indicate where arithmetic will begin during the number cycle. ♦ During multiply and divide, the uppermost digit of the Y register is used as a digit counter to limit the multiply/divide Facit 1123 Calculator loop.
- Page 3 X, X1, X2, X4, X8 43210987654321. DPR In Decimal Point DPR1, DPR2, DPR4, DPR8 Register (4 bits) DP0 – DP6 DPNE, DPGT, DP>6, DP<8 (decoder) K1, K2, K4, K8 Facit 1123 Calculator Section: Block Diagram Page: 3 Rendition: 2020 Oct 9...
- Page 4 U162 nØD3 U132 nØD11 n(ØD0•B2) U151 nØD4 U121 nØD12 U142 U151 nØD5 U121 nØD13 U141 nØD6 U122 nØD14 N120 N219 U141 nØD7 U122 nØD15 N118 N217 N318 U370 ØD15 Facit 1123 Calculator Section: Timing Page: 4 Rendition: 2020 Oct 9...
- Page 5 N263 N365 ASUM16 ØD0•B2 U256 n(OP•ØD0•B2p) N325 N328 NR29 2.2K Øp N246 N342 nØD14 U232 U266 9 U257 nOP•ØD14p 2.2K 2.2K U256 5962 Facit 1123 Calculator Section: Keyboard & OP Flag 4 U266 5962 Page: 5 Rendition: 2020 Oct 9...
- Page 6 U373 n(S20•nQ) (2) U364 n(S33•D•nQ) n(S11•N•nQ) U341 n(S22•Q) (2) n(S22•nQ) (2) n(A•P1•nR2•nQ) U341 3 U382 n(S30•Q) n(S31•nQ) n(S31•Q) N340 N239 Facit 1123 Calculator U365 CSCC n(S33•M•Q) n(S32•M•Q) Section: Control (part 1) n(S33•D•Q) Page: 6 Rendition: 2020 Oct 9 n(S23•M)
- Page 7 R Register nKRC nKZR U322 12 U321 12 U324 n(C•KF) U357 n(S20•nQ) R1+R3 U323 n(S30•Q) R2+R3 OP•ØD0•B1p U312 R0+R1 Facit 1123 Calculator nKCLR R0+R1 t o KB n(S12•nQ) U386 Section: Control (part 2) nKMD Page: 7 Rendition: 2020 Oct 9...
- Page 8 5962 6 U221 CYSS nDL1 13 U2685 ØnD0•Ø 4 U268 5962 U213 U214 U215 U216 U217 U218 U219 Z Register ASUM10 CZS10 ØnD0•Ø U237 CZØ Facit 1123 Calculator Section: X, Y & Z Registers Page: 8 Rendition: 2020 Oct 9...
- Page 9 U243 U232 n(OP•ØD0•B2p) U378 N210 3 U389 nDP4 U242 ØB1 U380 N208 CQXB1 nDP5 U241 12 U370 N206 ØB8 U241 nDP6 U358 nOP•ØD14p CQXB1 Facit 1123 Calculator Section: Decimal Point Register & Q Flag Page: 9 Rendition: 2020 Oct 9...
- Page 10 9 U254 6 U276 U254 to X, Z & DP U254 ØB1p Registers U256 U254 5 U257 2 U257 nØB8 ØnD0•Ø U267 CSCC U256 nØB1 U256 5962 Facit 1123 Calculator Section: Arithmetic U256 5962 Page: 10 Rendition: 2020 Oct 9...
- Page 11 N220 N236 N135 nDP6 nDP5 nDP4 nDP3 nDP2 nDP1 nDP0 ØB8 U111 U261 12 U253 DISP nDL4 nDL2 Y Register 2SC641 nDL1 ØB1 U112 nØ nØD1 Facit 1123 Calculator Section: Display Latch & Display Page: 11 Rendition: 2020 Oct 9...
- Page 12 N102 N201 2 AMP. M5304 M5310 M5320 M5330 M5340 M5352 M5373 M5391 M5962 2SC826 N301 2SC641 3.3K NK28 N143 N144 N271 N371 NK29 NR29 Unused Gates U112 Facit 1123 Calculator U243 Section: Power Supply Page: 12 Rendition: 2020 Oct 9...
- Page 13 Digit held in display latch after ØB1p – – – registers idle one full number cycle in registers Facit 1123 Calculator Clock Rates (as measured) DISP=1 (displaying): 43KHz, 23µS Section: Timing Diagram DISP=0 (calculating): 111KHz, 9µS Page: 13 Rendition: 2020 Oct 9...
- Page 14 M5340 ♦ M5962s are reversed in their orientation on the board b 6 c relative to all other ICs. b 7 c Facit 1123 Calculator b 8 c N b 71 N b 72 Section: IC Pinouts & Physical Layout...
- Page 15 GND 71 72 DP>6 16 — 45 nØD0 • Italicised expressions are connections with no signal name in the schematic. Facit 1123 Calculator • Bold-faced expressions are signal sources. • See preceding page for connector orientation. Section: Connectors Page: 15...