Advertisement
Quick Links
Facit 1123 Calculator
Section: Title and Contents
Page: 1
Rendition: 2014 Mar 6
Facit 1123
Calculator
Contents
Section
Title & Contents (this page)
Notes & Signal Names
Timing
Control (part 1)
Control (part 2)
Registers
Decimal Point Register & Q Flag
Display Latch & Display
Power Supply
IC Pinouts & Physical Layout
Page
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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.
Advertisement
Related Manuals for Facit 1123
Summary of Contents for Facit 1123
- Page 1 IC Pinouts & Physical Layout Connectors Facit 1123 Calculator This schematic has been derived through the reverse engineering of a Facit 1123 calculator. Section: Title and Contents This is not the manufacter’s schematic, nor is it Page: 1 Rendition: 2014 Mar 6...
-
Page 2: Facit
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: Block Diagram
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: 2014 Mar 6... - Page 4 IC162 nØD3 IC132 nØD11 n(ØD0•B2) IC151 nØD4 IC121 nØD12 IC142 IC151 nØD5 IC121 nØD13 IC141 nØD6 IC122 nØD14 N120 N219 IC141 nØD7 IC122 nØD15 N118 N217 N318 IC370 ØD15 Facit 1123 Calculator Section: Timing Page: 4 Rendition: 2014 Mar 6...
-
Page 5: Keyboard And Op Flag
NK45 NR42 N263 N365 IC256 ASUM16 ØD0•B2 n(OP•ØD0•B2p) M5962 N325 N328 NR29 2.2K Øp N246 N342 4 IC266 nØD14 IC232 9 IC257 nOP•ØD14p M5962 2.2K Facit 1123 Calculator 2.2K Section: Keyboard & OP Flag Page: 5 Rendition: 2014 Mar 6... - Page 6 IC373 n(S20•nQ) (2) IC364 n(S33•D•nQ) n(S11•N•nQ) IC341 n(S22•Q) (2) n(S22•nQ) (2) n(A•P1•nR2•nQ) IC341 3 IC382 n(S30•Q) n(S31•nQ) n(S31•Q) N340 N239 Facit 1123 Calculator IC365 CSCC n(S33•M•Q) n(S32•M•Q) Section: Control (part 1) n(S33•D•Q) Page: 6 Rendition: 2014 Mar 6 n(S23•M)
- Page 7 R Register nKRC nKZR IC322 12 IC321 12 IC324 n(C•KF) IC357 n(S20•nQ) R1+R3 IC323 n(S30•Q) R2+R3 OP•ØD0•B1p IC312 R0+R1 Facit 1123 Calculator nKCLR R0+R1 t o KB n(S12•nQ) IC386 Section: Control (part 2) nKMD Page: 7 Rendition: 2014 Mar 6...
- Page 8 2 IC221 nØD14 IC258 nDL2 IC277 ØB1 IC258 6 IC221 CYSS nDL1 IC213 IC214 IC215 IC216 IC217 IC218 IC219 Z Register ASUM10 CZS10 ØnD0•Ø IC237 CZØ Facit 1123 Calculator Section: X, Y & Z Registers Page: 8 Rendition: 2014 Mar 6...
-
Page 9: Arithmetic
IC243 IC232 n(OP•ØD0•B2p) IC378 N210 3 IC389 nDP4 IC242 ØB1 IC380 N208 CQXB1 nDP5 IC241 12 IC370 N206 ØB8 IC241 nDP6 IC358 nOP•ØD14p CQXB1 Facit 1123 Calculator Section: Decimal Point Register & Q Flag Page: 9 Rendition: 2014 Mar 6... - Page 10 ASUM10 IC254 IC245 9 IC254 6 IC276 to X, Z & DP ØB1p IC254 Registers IC256 M5962 IC254 5 IC257 2 IC257 nØB8 ØnD0•Ø IC267 IC256 CSCC M5962 nØB1 Facit 1123 Calculator Section: Arithmetic Page: 10 Rendition: 2014 Mar 6...
- Page 11 N220 N236 N135 nDP6 nDP5 nDP4 nDP3 nDP2 nDP1 nDP0 ØB8 IC111 IC261 12 IC253 DISP nDL4 nDL2 Y Register 2SC641 nDL1 ØB1 IC112 nØ nØD1 Facit 1123 Calculator Section: Display Latch & Display Page: 11 Rendition: 2014 Mar 6...
- 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 IC112 Facit 1123 Calculator IC243 Section: Power Supply Page: 12 Rendition: 2014 Mar 6...
-
Page 13: Timing Diagram
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: 2014 Mar 6... -
Page 14: Ic Pinouts & Physical Layout
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: Connectors
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...