Schematic
IME 86S Calculator: Reverse-Engineered Schematic
A 27-page schematic of the IME 86S, the IME 84's successor: discrete germanium logic, core memory and Nixie display.
Schematic
A 27-page schematic of the IME 86S, the IME 84's successor: discrete germanium logic, core memory and Nixie display.
IME 86S Calculator Schematic Contents Section IME 86S Calculator Section: Title & Contents Page: 1 Rendition: Mar 19, 2026 Page Title & Contents (this page) 1 Notes 2 Block Diagram 3 Timing 4 Digit Timing 5 Keyboard & Execution 6 Procedure Selection 7 Program Sequence Counters 8 Programs EQ/MP/DV 9 F31 &F32, Sub MP/DV 10 Programs Raise/SR, Sub SR 11 Sign Flags 12 DP Position & Tracking Counters 13 Numeral Entry & X,Y,Z Gating 14 X,Y,Z Decade Counters & Output Selector 15 Arithmetic, Overflow & Memory Sense 16 Memory Selector 17 Memory Decoders, Drivers & Core Matrix 18 Display 19 Power Supply Timing Graph Modules - Gates Modules - Pulsers, Buffers & Inverters Modules - Flip-Flops Connectors N1::N17 Connectors N18::N34 Element & SIgnal Names 20 21 22 23 24 25 26 27 This is a re-presentation of the manufacturer’s schematic. /bhilpert Notes ♦ Gate symbols and signal names are presented in accordance with: logic 0 = 0V, GND logic 1 = –12V Nbb.pp ♦ The symbol denotes a physical connector pin. bb=board, pp=pin. Solid black end is the male side of the connector. White end is the female side of the connector. ♦ Arrows indicate direction of signal or energy flow. ♦ The symbol with no label denotes –12V. ♦ The symbol with no label denotes +6V. ♦ These drawings are a redrawing and interpretation to logic of the original IME discretecomponent schematic, with additional information from J.Ongena from examination of Unit 51409751. ♦ Assorted connections to the Remote Connector are not shown in these drawings. Revision Log ♦ 2024 Aug: Initial drawing / bhilpert. ♦ TO DO: - Enumerate gates so TOP can reference a specific gate. IME 86S Calculator Section: Notes Page: 2 Rendition: Mar 19, 2026 Timing C Counter FC 1 Master Clock FC 2 FC 4 Digit Counter FC 8 FD 1 FD 4 Subroutine Sequence Counter FQM1 FQM2 FQM4 FQM8 FQB1 FQB2 FQB4 Debounce All keys FEX QM≠0 Power Supply EXEC ØDA,B,C,D ØDa,b,c,d ØR,ØW,ØA, etc. Main Sequence Counter Control FD 8 4 to 2-of-8 Decoder Timing Decoders ØM FD 2 Numeral Entry Clear & Shift Program Selection FEEN FRS1 FPa2 FPb2 FESH FRS2 FPa1 FPb1 FECL Keyboard –12V –6V F31 Micro-Program Logic Matrix +6V logic supplies F32 Fsr FPN FOWP FOW FPPEX FGZ FKP Numeral Encoder Register Selector FAA FBB TCCLK ØDA,B,C,D ØDa,b,c,d ØDA,B,C,D ØDa,b,c,d GAA,BB,GG FGG KDL KDR FCS FSP FSQ FSM FSA G8 FSB FST FS1 FS2 Neg. Lamp Sign Selection Decoder G4 FS3 Register Selection Decoder 7 Row Drivers Register Selection Decoder 7 Row Drivers logic G1 state interface multiple signals I/O 4-bit data bus Register Selection Decoder Register Selection Decoder 7 Row Drivers 7 Row Drivers X Decade Counter Sense P4 Amp Section: Block Diagram Page: 3 Sense P2 Amp Rendition: Mar 19, 2026 DP=ØD Comparator XROLL Y Decade Counter XINC FXR ØM Arithmetic Count Countrol YROLL YINC FYC Display Digit Decoder 16 Digit Anode Drivers Selector Sense P1 Amp Numeral Decoder IME 86S Calculator DP Position Counter 4 to 2-of-8 Decoder Z Decade Counter Sense P8 Amp FS4 G2 TC=DP FDP FDP FDP FDP 1 2 4 8 Core Array Sign Flags TC=ØD Coincidence FSC3 Detector 16 Column Drivers GMA,B,C,D GMa,b 4 to 2-of-8 Decoder Comparator Register Digit Decoder 2-of-8 to1-of-16 3 to 2-of-6 Decoder Tracking Counter FTC FTC FTC FTC 1 2 4 8 KN1,2,4,8 KAA,BB,GG Overflow Lamp FUD G... Control signals Register Encoder –85V +85V display supply 10 Numeral Cathode Drivers DP Driver 16 Nixie Displays 6543210987654321. 1K 1n 1n 7.5K 7.5K 1K Q 30A-2 T30.2 T~ -b T~ -b ØM 1~ 1 N3.2 ØM 30A-2 1~ 30A-2 ØM N30.4 30.15Nv N4.9 N6.6 30A-2 2~ N30.7 30A-2 8~ 30A-4 30.18Nv 30.17Nd 4 GSRz~ ØD15 4 8~ 8 30A-4 30R-0 30A-4 30.16Nv N30.3 N5.4 4.7K 5.8Nv ØA 220p 30A-4 ØR 8~ 4 2 N25::28.8 1 N12.9 Ø1R N30.8 30A-3 8 30A-3 2~ 30A-3 30R-0 N30.21 30.1Nv N30.2 N20::23.7 N34.17 ØRL 1~ N5.18 N4.8 ØA1 ØGS N11.7 N13.5 30A-3 N33.16 ØM~ ØGD ØGS 4.2Nd ØGS~ ØGS 11.8Nd ØGS~ 4.3Nv N4.15 29.9NG 8~ BLW 4~ N29.11 8~ 30A-0 1 2 ØM~ 2~ ØM 30A-4 30.14Nv 30.13Nv N30.6 N18.10 N20::23.9 N25::28.7 30R-0 30A-4 IME 86S Calculator Rendition: Mar 19, 2026 N30.16 N29.16 30A-2 ØD 2 N30.11 4~ Section: Timing Page: 4 8 N11.8 N30.1 N25::28.5 30A-4 4A--6 4~ 4~ ØN~ QM8 Q~ 1~ 30R-0 ØD0 ØGS~ 2 2~ 30A-2 30A-2 FC8 T~ -n T30.11 10 4~ N5.10 8 Q FC4 T30.8 9 Q~ 2~ N30.20 4~ T~ -n Q~ ØM ØN Q FC2 T30.6 7 Q~ T30.3 ØM~ Q FC1 T30.4 5 30A-3 ØW ? 3K 30.12PH N30.5 N3.5 N32.19 ØPCL GSRc~ 29A-6 GSRz~ UP~ 29.10Nv DOWN~ 29A-1 TG~ -gg1 Q ØD 29A-6 T~ -n TG~ -gg1 TK~ Q FD1 T29.1 2 FD2 T29.4 3 Q~ TK~ TG~ -gg1 TK~ Q TK~ Q FD4 T29.6 5 Q~ TK~ TG~ -g1 FD8 T29.7 8 Q~ TK~ TG~ -g1 Q~ TG~ -g1 N2.21 1~ N3.9 1 2~ 2 4~ 4 8~ 8 N4.1 N5.1 2 N6.2 1 29A-6 N29.6 N8.6 ØDD ØDd ØDA ØDb 29A-4 SG~ -p 29A-4 SK~ RE~ -k 2 N16.11 SK~ Q N29.22 N30.22 1~ 1 N1.21 N3.15 8 4 29A-6 N29.2 N29.7 N1::2.7 29A-6 N29.8 N1::2.8 8 4~ 29A-6 N29.3 2~ 1~ 29A-6 N29.9 N9.15 N1::2.9 ØDD N1::2.2 ØDC N25::28.2 ØDb 8~ 4 29A-6 N29.4 N26.6 ØN~ N1::2.1 N25::28.1 ØDc N27.6 2~ N29.15 29A-6 ØN FØN T29.11 12 Q~ ØDd N28.6 N12.15 SG~ -p N1::2.6 N1::2.3 ØDB N25::28.3 ØDa 8~ 4~ 29A-6 N29.5 N25.6 N1::2.4 ØDA N25::28.4 N12.18 N30.15 N33.11 1 DP=ØD 29A-3 N29.17 4.7n N7.11 VP ØDA ØDa Major-minor Decoding 2 • (1-of-4) IME 86S Calculator Section: Digit Timing Page: 5 Rendition: Mar 19, 2026 N29.10 ØDd N5.9 N11.5 ØN~ ØDD a b c d ––––––––––– A | 0 1 2 3 B | 4 5 6 7 C | 8 9 10 11 D |12 13 14 15 29A-3 ØD0 N30.10 29A-4 N29.1 N7.4 ØD15 RC NR.? NKB.5 <• NKB.7 KRC 1 KDL~ 2 220 N9.8 N2.17 1 2 10n KDLs~ •> NKB.9 220 N9.4 N2.18 – NKB.12 KDRs~ 22K 10n x NKB.17 100 N17.17 10n ÷ NKB.16 N17.20 10n KBA-0 C NKB.8 10n NKB.6 6 KDV~ 7 KSR~ 8 N9.3 N16.16 5 6 6 1 1C 1C 1= 1= 2 2 2C 2C 2= 2= 3 3 3C 3C 3= 1 1C R5 KBA-0 R7 KBA-0 NKB.20 7 7 1 3 8 5 7 9 4 4C 4C 4= 4= KN1~ 10n 9 N6.11 N17.15 NKB.11 22K 220 N3.19 NKB.10 KNMs~ 22K 220 N3.18 KNM~ 10n SG~ -n 10n EXEC~ R7 CMT~ 1= SK~ RK~ RG~ -n Q FKP Q~ FKP~ FKP T3.8 7 2 2C KBA-0 R5 2= R6 3 3C KBA-0 NKB.21 100 N19.21 KBB~ 10n KEQ~ R7 KBA-0 R6 3= KMP~ R5 4 4C R3 R6 KBA-0 R3 KBA-0 NKB.22 KDV~ 100 N19.20 KGG~ 10n R7 KC~ N17.16 KSR~ 4= KBB~ 9A-22 N9.9 KNEG~ 4A-0 N4.19 KOP~ 1A-0 N1.15 KMEM~ 19A-0 N19.16 KDL~ KOP~ 17A-10 N1.18 KDR~ N16.15 KAA~ 3= 4 6.8K 220 N31.20 NKB.4 KBA-0 KAA~ 10n KN2~ 10n 100 N19.22 6.8K 220 N31.19 NKB.3 KBA-0 • R3 1 KN4~ 10n 0 T 6.8K 220 N31.18 NKB.2 KBA-0 KBA-0 B KN8~ 10n 2 3 6 KC~ 10n KCs~ 6.8K 220 N31.17 7 9 220 N6.22 A KMP~ 22K 100 N17.21 5 22K 100 √ KNEG~ 22K NKB.1 KBA-0 4 5 4 4 220 N4.20 3 KDR~ 10n 8 9 3 19A-2 KMEM~ KNM~ 3A-0 N3.16 CMT KGG~ 1= 2= 3= KBA-0 N18.15 4= 22K 100 NKB.19 N17.22 KEQ~ 10n KEQs~ 220 2.2K SG~ -n = 5µ 4.7K 1C SK~ 6.8K ØN~ RK~ 2.2K 2C 3C ØN KBA-0 15K 220 NKB.18 N32.20 KCM~ IME 86S Calculator Section: Keyboard & Execution Page: 6 Rendition: Mar 19, 2026 R 1 3 2 T 4 A B (GBA)~ 000 001 010 011 100 101 110 DCBA-ba 0001-01 0001-10 0010-01 0010-10 0100-01 0100-10 1000-01 L 4 5 3 6 2 7 1 15K FEX~ 3A-0 T3.13 T3.1 CK FEX Q~ 2.2K 10n 4C RG~ -j Q FEX T3.3 2 QM0 QMA QMa EXEC~ N3.17 N2.11 N16.10 N4.21 16A-2 N6.7 4.7K N9.1 N17.11 N19.19 N31.21 N32.21 EXEC~ KOP~ EXEC~ 17.1PL 10K KEQ~ E X KMP~ X D KDV~ D KSR~ R E R E X D R nop = 0 C = 1 DR = 2 DL = 3 KC~ KDL~ KDL~ KDR~ 9A-6 9A-6 SK~ QBB RE~ -p 1 Q~ 1~ FPCD1 T9.12 11 SG~ -x SK~ RE~ -p 1~ 2~ RK~ RG~ -y 1 Q 2 FPCD2 T9.14 13 Q~ 2~ 1~ 2 1 2 2~ 2~ 9A-3 QBd 9A-3 9R-0 9.9Nv a2~ GCL~ a1~ 9A-6 9.7Nv 9A-6 9.8Nv GSRz~ GSL~ 17A-22 SK~ 9A-3 QBd 9A-3 9R-0 RK~ 17A-22 RG~ -y 9A-0 Q a1 9.1Nv GAA~ SK~ 9R-0 9.5Nv RK~ Q~ a1~ RG~ -z b2~ 17A-3 S -1 KNMs~ KOP~ 17A-2 MB 17A-2 9A-4 QBd N17.7 N13.1 17A-6 PPEX 17A-2 SK~ 17R-22 SG~ -n SK~ RE~ -p a2~ 17A-6 a1 Q N Q~ N~ N17.9 N13.4 FPN T17.1 2 PEQ•N b2~ b1 17A-6 N14.4 17A-6 N17.5 N14.5 PPEQ N14.1 PEQ•(N~) N15.2 GBB~ a2 9.3Nv b1~ SG~ -p N 9R-0 Q~ SR = 0 EQ = 1 DV = 2 MP = 3 b2 QBB b1 10K a1 9A-4 Q FPb1 T17.3 4 17A-6 a2~ 9A-0 b2~ SG~ -z N 9R-0 Q~ RK~ QMC 9A-4 QBc RG~ -z FPa1 T17.6 5 N~ QBc a2~ b2 {2} SG~ -y EXEC~ 9A-0 9A-4 QBb RK~ Q~ Q FPb2 T17.10 9 SK~ QBEN~ 2 1 QBb 9A6 SG~ -z {1} a1 9A-0 a2 FPa2 T17.7 8 SK~ 17A-22 Q RG~ -p a2~ Q {4} SG~ -y QMC SG~ -x EXEC~ {3} 17A-22 b1 17A-6 N17.4 N14.7 17A-6 N17.1 PMD•N PPMP N14.2 b2 GGG~ N13.2 b1~ 17A-6 N17.8 N13.3 PPDV N14.3 N16.22 a2~ a1~ 17A-6 PSR N17.6 N15.7 b2~ b1~ 17A-6 PPSR N17.2 N16.21 N13.22 N14.22 N~ IME 86S Calculator Section: Procedure Selection Page: 7 a2 17A-6 a1 b2 Rendition: Mar 19, 2026 b1 N17.3 N15.10 PMM•(N~) 10K 220 KCs~ 10n ØN 16A-4 16.1PL KOP~ 16A-10 QMB QMc 16A-6 16.2PL F32 16.3PL 16A-0 16A-4 QMA ØN QM6 16A-2 N16.20 16.12Nv N6.8 16.13Nd 16A-2 PPDV 16A-2 PSR N16.19 16.11Nv N5.5 N7.6 N16.18 16.10Nv N6.15 N7.16 N8.2 BSR~ BDV~ N8.5 N10.11 Q 16A-0 10K 16.4PL QMa PPMP PEQ•(N~)•PPEX 16.1PP EXEC~ 16A-10 Q FQM1 T~ -p10 T16.3 2 T~ -p R~ R~ Q~ Q FQM2 T16.5 4 T~ -p Q~ R~ 1~ 1 2~ 2 4~ N7.8 2 N8.3 1 N16.3 16A-6 13.8 N10.15 2 N18.22 1~ QBEN QBEN~ QBEN~ N18.21 16A-6 N9.2 N8.15 N4.2 QBEN~ F32 2~ 8A-4 BMP~ N16.5 16A-6 13.11 8.9NG 16A-6 N16.8 N4.6 2~ QM8 16A-6 1~ BDV~ 14.9 17.10 8~ ØN QBLP~ 8A-6 T~ -n 4 QMb R~ T~ -n Q~ R~ 1 R~ 2~ 8A-2 QBd N8.10 N7.1 N9.10 N10.9 N12.6 2 1~ 8A-2 N8.11 N7.3 QBc N9.11 N10.10 2~ 1 8A-2 N8.9 N9.7 N10.4 QBb N11.4 N12.3 2~ 1~ 8A-2 N8.8 N7.9 N11.1 N12.1 N8.7 FQB4 T8.6 5 QBa N9.6 QBB N12.20 Q~ QBB 2 13.7 N16.7 14.10 15.9 Q T~ -n Q~ 1 2 Section: Program Sequence Counters Page: 8 Rendition: Mar 19, 2026 16A-6 4~ QMa FQB2 T8.4 3 N16.4 QMB 15.5 8~ Q FQB1 T8.2 1 1~ IME 86S Calculator 16A-6 8A-0 8.10NG 13.10 15.11 14.8 14.11 Q F31~ N18.18 8 QMC N16.2 QMc N16.6 1 F31~ 16A-6 4~ 15.8 QMa 8.7Nv 8~ 15.4 N11.15 QMC 8A-2 Q~ 4 8 QMd 14.6 15.6 BSR~ R~ BMP~ N12.10 BDV~ T~ -p Q~ FQM8 T16.9 8 QM0 N9.17 BMP~ Q FQM4 T16.7 6 9.15Nd QBA QMA PMD•N PPMP PPDV PEQ•N 14A-6 14A-6 PPEQ PPMP PPDV PPSR PEQ•(N~) 14A-6 PPEQ 14A-6 14A-6 14A-6 14A-6 GGG~ GGG~ GBB~ GBB~ GAA~ GAA~ PEQ•N GCL~ 14A-4 GFG~ 14A-4 GTR~ 14A-4 14R-0 14A-4 14A-4 QMb M01 14A-0 13A-3 13A-6 PPSR 14.1Nv QMA 13A-6 PPDV QMc M02 14A-0 QMC QMc M10 13A-6 PPMP 14R-0 13A-3 14.7Nv QMd QMd M03 14A-0 14A-3 14A-3 QMb N QMc 14A-3 14A-3 QMb QMC QMc 14A-3 14A-3 QMd 14A-4 NK.15 M11 QMA M02 N13.9 boxN REMOTE 14A-0 RB 14.4Nv 14A-3 14A-0 14.3Nv 14A-0 14.2Nv 14R-0 QMc IME 86S Calculator Section: Programs EQ/MP/DV Page: 9 14.5Nv RB QMC 13.2Nv +R4 QMB 13.1NG ØGS 13A-3 13.5Nv GR4INC~ M05 10n RA Rendition: Mar 19, 2026 N14.19 13.8NG ØGS 14A-0 14R-0 M10 13A-3 GAAB~ 14R-0 14A-3 14A-4 M09 22K QMb boxS 14R-0 QMC 220 RA 14R-0 M10 N13.15 14A-3 14R-0 QMC 13.4Nv PEQ•N NK.13 M09 13A-0 M09 14.6Nv S QMC M07 RA QMC RT 14A-3 13.3Nv 14A-0 14R-0 QMA 13A-0 RT QMb 14A-3 M07 13R-0 QMB 14A-3 14A-3 RB QMd 13A-3 RT 14R-0 14A-3 13A-3 GAGG~ 13R-0 QMB 14R-0 14A-4 14A-4 RB QMA 14A-4 GAOP~ 13A-6 PPEQ N19.15 GFK~ a b c d ––––––––––– A | 0 1 2 3 B | 4 5 6 7 C | 8 9 10 11 D |12 13 14 15 220 22K 10n RB 13.6Nd 13.7NG 2.2K BSR~ GGG~ SRf~ GBB~ 2.2n GAA~ GAAB~ BMP~ GSRz~ F32~ ØD15 B2+6 DP=ØD QBc S~ BSR~ SK~ F32~ BDV~ 7A-6 TC=DP BMP~ 7A-6 N7.18 SG~ -p3 N9.5 RK~ BMP~ QBc 7A-6 BDV~ SRB7~ 10A-0 10R-0 10.3NG 10A-4 F32 F31 QBd BDV~ B1+5 Q~ F31~ N7.22 RG~ -p QBb N8.22 R– GASUB~ N10.5 R– RG~ -p QBb VP 10A-3 B1+5 QBEN QBLP~ 10.10NG RT RG~ -p3 QBc RK~ SRf~ GSRc~ 10.9NG 10A-3 FCS N29.21 10.1NG B3+7 RK~ SRf~ N10.8 RA Q RK~ 22K RB B2+6 10A-4 F31~ (QBEN-D) F31 T7.2 1 22K TC=DP N8.17 SK~ TCROLL F32 SG~ -p3 SK~ X=0~ QBa QBc RT 10.2NG 10A-4 F32~ SG~ -p3 ØD15 GSL~ BMP~ 7.1PL 7A-6 10.6NG B2+6 B3+7 RG~ -p3 QBd RC~ (D-8) RB 10.5NG 10A-4 F32~ RA QBd S~ SRB7~ TC=DP ØD15 DP=ØD QBd F31 TCROLL 7A-6 7A-6 22K BDV~ 7A-2 F31~ 7A-2 BDV~ 7A-2 F31 7A-2 7R-22 RK~ RG~ -p 22K F31~ BMP~ BDV~ 10.8NG N7.21 GBB~ GAA~ N16.9 Q GZ~ F32 GAGG~ Q~ BMP~ N7.20 N10.7 QBa F32~ 11.3NG B0+4 Z=0 B1+5 11.7Nd 11A-3 RC~ (D-8) 10n N11.20 N31.22 11.2NG ØGS R– F31 Section: F31 & F32, Sub MP/DV Page: 10 Rendition: Mar 19, 2026 RB RT 11A-0 QBb IME 86S Calculator 100 11.1NG ØGS~ RK~ QBEN QBLP~ R– 11.4NG RG~ -p3 RG~ -p 11A-3 ØD0 QBb GSEL~ RA ØGS~ RG~ -p3 SRf~ GGG~ N10.6 RK~ 7A-6 10A-4 RK~ DP=ØD TCROLL N8.1 SG~ -p3 F32 T7.4 3 QBc ØD15 RA (QBEN-D) SK~ 7A-6 TC=DP F32~ SG~ -p 7R-22 10.4NG 10A-4 SG~ -p3 SK~ F31~ F32 F31~ SK~ BMP~ 10.7NG RB SG~ -p3 SK~ SRf~ 10A-4 B3+7 F32~ 7A--0 B1+5 N7.19 11A-4 11.5NG N11.3 F31•nF32 11.6NG ØGS~ ØD0 ØR 11A-3 11A-0 11A-0 P1~ P4~ ZDOWN~ GGG~ GGG~ GBB~ GBB~ GAA~ GAA~ BSR~ GCL~ GFG~ GTR~ PSR R4 QMA QMb M01 15A-4 15.2Nv QBb 9A-3 QBd 9A-3 QBc 9A-4 QBd 9A-4 15A-4 PMM•(N~) 15A-3 QMc M02 15A-4 F31 QBB QBc M03 15A-0 15A-3 RA 9.6NG B0+1+ ((2+3)•F31~) RT 9.4NG 9A-3 B6 GAA~ 15.5Nv GSL~ GASUB~ RA QMB 15A-3 9A-0 9.10Nv RT QMA QMd PEQ•(N~)•PPEX B(1+3) •(ØN~) QBA 9A-0 15.3Nv 15R-0 9.2NG ØN~ RB QMA 9A-0 9R-0 9R-0 GSL~ +R4 QBA QMb 15R-0 QMC M05 15A-4 GAAB~ 15.6Nv M09 RB 15A-0 QBB QBa PPEX QMA QBLP~ BSR~ M01 15A-4 15R-0 QBB QBb B4 12.4NG 12A-4 12A-6 QBa R– B5 Ø1R 12.10NG 12A-3 12A-4 12.3Nv ØN~ 12.2PL FCS RT 15A-0 QMb 15.7Nv R– QBB RB QMA QMc M02 15A-4 QBb 15.1Nv B5 12.7NG 12A-4 SG~ -r6 SK~ ØN RK~ Q Fsr T12.1 2 RG~ -r6 R4 QMC QMd M11 15A-3 RC~ 15.8Nv QBB PMM•(N~)•(PPEX~) QBb RA QMA 15A-3 15A-3 QMb M01 15A-3 12.9NG 12A-3 B5 15.9Nv QBB QBd 15R-0 B7 N12.7 12.6NG 12A-3 N12.2 ADDAA~ N11.2 11A-0 R4 QMB QMb M05 15A-0 15.4Nv RB RT QMB QMd QMB QMd QMC QMb M07 15A-3 ØGS GAOP~ GAGG~ 15.13Nv 15A-2 12.5NG 12A-0 12.8NG 12A-0 GR4INC~ 15R-0 M09 SRB7~ 11.9NG Ø1R M07 N7.15 15.10Nv 15A-2 PEQ•(N~) SG~ -p3 QMC IME 86S Calculator Section: Programs Raise/SR, Sub SR Page: 11 Rendition: Mar 19, 2026 PMM•(N~) SK~ RK~ 15A-6 Q FPPEX T15.12 11 RG~ -p3 Q~ 15A-6 N15.3 N16.17 N15.22 N17.18 PEQ•(N~)•PPEX PPEX 12.1PL P1~ P2~ Q~ 12A-0 ZCLK GMa N18.1 GMb N6.10 N17.19 N4.5 MB KNEG~ GMA GMD FCS EXEC~ GMB GMC N10.2 N12.21 BMP~ 18A-0 18A-6 BDV~ R 18A-2 S -4 Q QM8 18A-3 R FCS SG~ -n FSB T18.6 5 18A-2 R R -4 18A-6 18R-0 18.4Nv 4A-2 Q~ 18A-6 FYC SK~ FSP 4R-22 SG~ -n FSQ~ SK~ 18A-0 R 18A-2 S -4 Q RK~ FSA T18.8 7 18A-2 R 18A-0 R 18A-2 R -4 4R-0 4.6Nv N4.17 N10.22 FCS FSP~ 4A-3 GASUB~ N12.5 5.10Nd N5.16 GASUB GASUB~ FSQ Q~ Q~ S -4 S -4 Q 18A-3 R 4mA-2 KNEGs~ 18A-2 R R -4 Q~ R 18A-2 S -4 Q 4mA-2 4mR-22 SK~ KOP~ FSM1 T18.12 11 R -4 Q FSM T4m.3 2 RK~ 18A-3 R Unit 51409751 Board 4 Modification SG~ -n EXEC~ 18A-0 4mA-4 4m.1Nv GTR ØGS~ Q~ 4m components are on a small board labeled “Minus-Logik” wired to board 4. 4mA-2 *m: ØGS input diodes are on board 4 but are part of this modification. FSQ~ RK~ GTR 4mA-2 RG~ -n RG~ -n FSQ Q~ 18A-0 QBEN~ R 18A-2 S -4 Q 18A-3 R FCS 18A-2 R R -4 R 4A-2 S -4 Q 18A-3 R FSM3 T18.14 13 18A-2 R R -4 ØN 18R-22 Q~ 18.3BF RE~ -p R 4A-2 S -4 Q 18A-3 R FSM4 T18.18 17 18A-2 R R -4 Q~ IME 86S Calculator Rendition: Mar 19, 2026 QBEN~ R 18A-1 Q~ S -4 ND.? LM N18.20 22 FSP~ 18.2Nv 1K Q FSQ Q~ N4.4 N18.8 SETN N4.3 4R-22+ N18.9 RESETN GTR 18A-0 *m 4A-2 FSQ *m FSQ~ FSQ~ ØN 4A-2 18.20BF ØW 18A-0 FSQ T4.9 10 RE~ -p 4A-0 ØN ØGS NEG R 18A-2 4A-2 FSP ØGS~ N18.19 N4.7 SN 18A-0 FSP FSP T4.7 8 ØR S -4 Q 4R-22+ ØN ØGS Q~ 18A-0 R 18A-2 4A-2 FSP~ FSM2 T18.16 15 Section: Sign Flags Page: 12 4A-3 RG~ -p FST T18.10 9 18A-2 R Q FCS T4.12 11 ØN 18A-3 R GAOP R 4A-2 4A-3 GCL 18A-2 18R-0 18.19BF 220 2.2K 10n 220 2.2K UP~ KDL~ DOWN~ KDR~ 10n 2A-3 Q TG~ -mb6 TK~ FDP1 T2.1 2 TK~ EXEC~ TG~ -mn6 TGv~ m2m6 Q Q FDP2 T2.4 3 Q~ TK~ TK~ FDP4 T2.5 6 Q~ TK~ TG~ -m 1~ TG~ -mn6 TK~ Q~ TK~ TG~ -m 1 2~ 2 4~ 2A-4 4 ØDd 2 2A-4 4~ 2A-4 N3.3 ØDC ØN~ 2~ 8~ 1 2A-4 4 ØDb 1~ 2A-4 4~ ØDa BMP~ 7A-2 TC=ØD N8.18 N1.5 2A-4 SE~ -r3 QBEN 8A-2 8.8PP UP~ ØN DOWN~ 1.9Nd TCCL~ TG~ -mn6 Q TCCLK N3.1 N1.10 N8.4 4.7K TG~ -pn6 TK~ FTC1 T~ -m3 T1.1 2 Q TK~ Q RC~ 1~ TK~ Q~ TG~ -p TG~ -p RC~ RC~ 2 4~ 2 N7.2 N1.11 N7.7 TC=DP RE~ -r Q~ 1.1PL 1A-6 Q~ 4 TCROLL 1.2PL 8~ 8 4 1A-4 ØDD 2 1~ 8 1A-4 4~ ØDc 1A-4 ØDC 2~ 1 8~ 1A-4 ØDb 1~ 4 1R-0 2~ ØDa N2.20 8 1A-4 ØDd Section: DP Position & Tracking Counters Page: 13 Rendition: Mar 19, 2026 TK~ RC~ 2~ Q FTC8 T1.8 7 TG~ -m 1 1 TK~ FTC4 T1.5 6 Q~ Q TG~ -pn6 TK~ FTC2 T1.4 3 Q~ IME 86S Calculator DP=ØD~ FSC3 T2.13 12 10n BSR~ N6.5 N34.16 DP=ØD N1.22 DP=ØD ØDA 2.9Nv N7.17 N2.22 2.10NG 7.5NG 100 N7.5 2A-4 7A--4 BDV~ N6.5 N29.18 2.11Nd 2R-0 8~ 2A-4 29A-0 N2.10 ØDB 2R-0 2~ 7A--4 7R-0 8 8 2A-4 ØDc F32 8~ ØDD 1~ F31 4 8 1 F32~ Q~ TG~ -m 2 F31~ Q FDP8 T2.8 7 1A-4 ØDB 8~ 4~ 1A-4 N2.19 1R-0 ØN~ 1.11NG 1.12Nd 1A-4 10K 1A-4 ØDA 1.10Nv 1.13Nd N1.19 N3.21 N1.20 N3.4 TC=ØD TC=ØD~ GAGG~ GAAB~ BMP~ QBd GR4INC~ 8.3PL F31~ QBLP~ 8A-2 BDV~ QBLP~ 8A-2 ZCLK 4.7K 8A-4 FYC GAOP~ 8.4PL F31~ QBLP~ 8A-6 8.5PL 8A-0 8.2PL TCCLK GCL~ QBB QBc 8A-6 8.7PL 2.2K ØN~ RK~ FEX RG~ -p3 1n Q 3A-4 3.1PL 22K 3A-0 N5.11 N10.19 N8.20 4.1Nd N4.10 4.7K 4.4Nv GTR N15.18 GAOP GAOP~ QBLP~ N9.20 N2.5 N10.20 N3.10 N12.4 N6.4 N9.21 N29.19 GSL~ GSRz~ N6.17 N1.17 N9.22 N32.22 GCL~ GSRz~ GSRc~ GSRz~ N10.21 N29.20 29A-3 N2.16 GSR~ N3.11 3.5PL 3A-4 GSL~ Q~ TC=ØD~ 34A9 3A-2 3.11Nv 3.3PL 3A-0 GSR~ FEX 3A-47 3.4PL TCCLK ØN RG~ -p3 N15.15 EXEC~ FEEN T3.9 10 RK~ N4.11 N14.17 CMT FKP SK~ N13.16 N15.17 ØN EXEC~ 13A-0 N14.16 F32 SG~ -n 13A-0 GR4INC~ N12.19 8.6PL BSR~ KNM~ N6.19 N11.19 BSR~ QBB ØN N15.1 GSL~ ØN 8A-6 8R-22 8A-2 8A-6 BDV~ 8.1PL N13.17 GTR~ F32 ØN N12.22 GR4INC~ ØN 8R-22 N5.3 GAAB~ N13.6 BMP~ 8A-2 GAGG~ N11.21 N13.21 8A-6 BDV~ BMP~ N10.1 GZ 3.2PL 3R-0 3A-3 3A-0 3.12Nv N3.6 N31.16 N32.11 N18.16 N32.18 N33.18 N5.21 31.10 ZCL~ ØPCL DP=ØD DP=ØD~ FEX 3A-2 4.7K TC=ØD~ 3A-4 FKP DP=ØD ØM KCM~ 32A-3 SK~ EXEC~ 32A-3 SG~ -y3 GCL~ 3A-4 GZ~ SG~ -y3 32A-0 3A-4 SG~ -y3 SK~ TC=ØD FKP~ ØN 6A-2 MB 6A-2 EXEC~ ØN GCL RK~ RG~ -p3 Q~ 3A-4 RK~ ØN FKP~ RG~ -p3 GSL~ FEX~ RC~ GSR~ 6R-22 3A-4 ØA1 3R-0 RE~ -p 32.10Nv XYCL~ 3A-0 3.4Nv Q 5A-2 T~ -m 10K N5.20 N3.20 GSH RC~ ØN FGZ T5.3 2 Q~ RK~ RG~ -m2 SG~ -p SK~ 32R-0 Q FESH T3.6 5 RC~ KNMs~ 32.11Nv 32A-2 ØPCL SK~ FKP~ 10K 32R-0 SK~ FKP 10K TC=ØD~ SG~ -y3 Q FECL T6.2 1 Q~ 6A-0 6A-0 6A-0 GFG~ DP=ØD SE~ -p FUD T6.4 5 ØR 6A-4 RE~ -a3 6.3NG Q Q~ ØR 13A-0 13A-0 GCL~ IME 86S Calculator Section: Numeral Entry & X,Y,Z Gating Page: 14 Rendition: Mar 19, 2026 13.9NG ØGS 6A-4 6A-0 GBB~ 5A-0 N5.15 5.1Nd 31.15 32.15 11.11 GZ~ GXY GR4INC~ GAA~ 3.8 ØGS 33A-2 GZ GZ~ GY 2.2K GAA~ 220 P1~ 33.9Nd GZ~ GY~ GYa~ N33.17 N32.17 32A-2 GY~ GX KN1~ KN2~ KN4~ KN8~ P1~ P2~ P4~ P8~ LOAD from KEYBOARD ~ EXEC~ 220 GZ~ ZDOWN~ ENABLE LOAD from CORE ~ GX UP~ GY 31.9Nd DOWN~ GZ SG~ -m SG~ -m SG~ -m SG~ -m SK~ SK~ SK~ SK~ SG~ -b SG~ -b SG~ -b SG~ -b SK~ SK~ SK~ SK~ TG~ -mm6 TG~ -mm6 TK~ ZCLK N8.19 Q N31.9 T~ -b4 N10.16 RC~ FZ1 T31.1 2 TK~ Q~ RC~ Q TK~ Q~ RC~ Q TG~ -m FZ4 T31.5 6 TK~ Q~ RC~ Q Z8 FZ8 T31.7 8 Q~ X4 ZCL~ Z1 Z2 Z4 N31.11 N6.21 Y4 6.8K N11.6 P2~ P4~ P8~ X2 GYa~ SG~ -b SG~ -b SK~ YINC T~ -k3 RC~ Q SG~ -b SK~ FY1 T33.1 2 33A-3 Q~ T~ -k RC~ Q SG~ -b SK~ FY2 T33.3 4 T~ -k Q~ RC~ N33.1 33R-0 31A-2 N31.1 31R-22+ 32A-2 Q SK~ FY4 T33.5 6 SE~ -b RE~ -c Q~ RC~ Y2 Q FY8 T33.7 8 33A-3 N33.10 N5.22 N33.2 33R-0 31A-2 N31.2 31R-22+ YROLL Z2 Q~ 32A-2 33.10BF N33.22 N23.8 N34.22 G8 32R-0 N32.2 33A-2 Z=0 Z4 32R-0 N32.1 33A-2 Z8 31A-0 P1~ 32A-2 TK~ TG~ -m FZ2 T31.3 4 Y8 TG~ -mm6 TK~ TG~ -m X8 33.11BF N33.21 N22.8 N34.21 G4 32R-0 N32.3 33A-2 N33.3 33R-0 31A-2 N31.3 31R-22+ 33.12BF N33.20 N21.8 N34.20 G2 XYCL~ Y1 Y2 Y4 Y8 X1 32A-2 2.2K 220 GX P1~ P2~ P8~ Y1 33A-2 N33.4 33R-0 31A-2 N31.4 31R-22+ 32.12Nd SG~ -b SG~ -b SK~ XINC P4~ 32R-0 N32.4 T~ -k3 RC~ Q SG~ -b SK~ FX1 T32.2 3 32A-3 Q~ T~ -a RC~ Q SG~ -b SK~ FX2 T32.4 5 T~ -a Q~ RC~ Q Z1 SK~ FX4 T32.6 7 Q FX8 T32.8 RE~ -c 9 SE~ -b Q~ RC~ 32A-3 N32.10 N5.19 N33.16 N7.10 XROLL Q~ XYCL~ X1 X2 X4 X8 32A-4 IME 86S Calculator Section: X,Y,Z Decade Counters & Output Selector Page: 15 Rendition: Mar 19, 2026 32.1Nv X=0~ 33.13BF N33.19 N20.8 N34.19 G1 ØN~ 33A-0 5.12Nv N33.15 N5.7 5A-2 GAGG~ 5A-3 GASUB~ GXY GAOP~ ØA 5A-2 N5.6 N32.9 XINC Z=0 ØM GSL~ 6.12Nd ØN GASUB~ XROLL SE~ -p FXR T5.5 4 RC~ ØA 5A-2 Q 10K EXEC~ ØA 6A-2 5.11Nd ØD0 YROLL 10K FYC T5.7 6 RK~ RG~ -n2 ØA1 RK~ ØN RG~ -r YINC 5R-22 5A-0 N5.8 N33.9 N6.9 ØM Q~ SK~ 220 SETOW N5.2 N6.3 N5.17 N4.18 N8.21 33K T23.2 6.8K 47 10K 1K ØGS T23.3 N20.10 T23.5 4.7K 2.2K 100 10n N31.5 N32.5 6.8K 470n 10K 3.3K P8~ N33.5 10K 680 220p Unit 51409751: ** = 33K 2.2K 22K 1n T4.14 220p Q~ RC~ 2.2K T23.4 T23.1 V–6 MS8 15K RG~ -n FOW T6.9 8 FYC 10n GTR 6A-10 Q BSR~ 4.7K ØR RK~ 10n 5A-2 22 SG~ -n EXEC~ 10K KCs~ ØN ** 6.10Nd YINC BDV~ GASUB~ OVERFLOW ND.? SK~ BMP~ 5A-2 ØA1 S -6 SG~ -a 5A-2 Q 10n 6R-22 6A-2 ØA1 5.9PH Q~ 5A-2 Q~ S -4 Q FOWP T6.6 7 RE~ -p GASUB 5A-0 SK~ GASUB ØA1 ØA SG~ -w3 6A-4 N4.22 T4.13 2.2K 2.2K N20.11 SENSE AMP 8 10K STR MS4 N21.11 4A-6 SENSE AMP 4 P4~ MS2 N22.11 SENSE AMP 2 P2~ SENSE AMP 1 P1~ MS1 IME 86S Calculator Section: Arithmetic, Overflow & Memory Sense Page: 16 Rendition: Mar 19, 2026 N23.11 N21.10 N31.6 N11.22 N32.6 P4~ N33.6 N22.10 N31.7 N12.11 N32.7 P2~ N33.7 N23.10 N31.8 N6.20 N32.8 N11.9 N33.8 N12.8 P1~ N6.1 6.11Nd 1K EXEC~ 18.1Nd KEQs~ N19.17 19A-2 FEX N3.7 3A-0 6.8K N19.18 6.8K 19A-4 N6.18 N19.11 19A-6 N14.15 19.13PH ØGS~ GTR ØGS load current from GM 68K N15.16 GAOP load current from keyboard 19.2PL SS GFK~ GFG~ N20.6 19R-22 KMEM~ ØN clear current register 19.1PL N18.17 19A-3 4R-0 N19.10 N4.16 4.5Nv 4A--4 GSL~ 2A-0 N2.15 GCL~ 1A-0 N1.16 GAGG~ 11A-0 GSR~ GSEL~ N20.2 N20.4 GMA N21.2 N21.4 N22.6 N22.2 N22.4 N23.6 N23.2 N23.4 N18.7 N18.3 N18.5 N20.1 N20.3 GMb N20.5 GMB N21.1 N21.3 N21.5 N22.1 N22.3 N22.5 N23.1 N23.3 N23.5 N18.2 N18.4 N18.6 GMC GMD send G selection to GM 19.15Nv 4A--4 GMa N21.6 19.14Nd send current to GM N6.16 N9.16 N10.16 N11.10 KAA~ N11.16 SG~ -m N12.17 SK~ 19A-4 19A-4 S -6 FAA T19.5 6 R -6 N13.18 Q GAA~ N14.18 N19.7 19A-2 19R-0 N15.19 Q~ N19.6 19.8Nv 19A-2 N19.1 19.7Nd GMa GMb R~ N9.19 KBB~ N10.18 SG~ -m N11.18 SK~ 19A-4 19A-4 S -6 FBB T19.3 4 R -6 N13.19 Q GBB~ N14.20 N19.8 19A-2 19R-0 N15.20 19.10Nv 19.9Nd 19A-2 Q~ bb bb bb~ gg bb~ R~ gg bb gg~ bb~ ? check DCBA vs ABCD !! R B A M4 T M2 M3 M1 GBA 001 010 011 100 101 110 111 DCBA-ba 1000-01 0100-10 0100-01 0010-10 0010-01 0001-10 0001-01 L 1 7 2 6 3 5 4 IME 86S Calculator Section: Memory Selector Page: 17 Rendition: Mar 19, 2026 gg~ N9.18 KGG~ N10.17 SG~ -m N11.17 SK~ 19A-4 19A-4 S -6 FGG T19.1 2 R -6 R~ N13.20 Q Q~ GGG~ N14.21 N19.9 19A-2 19R-0 N15.21 19A-2 19.12Nv gg 19.11Nd gg~ 19A-0 19A-0 19A-0 19A-0 N19.2 N19.3 N19.4 N19.5 GMA GMB GMC GMD V–12 V–12 V–12 V–12 GM GM GM GM D C B A GM GM b a V–6 G8 75 75 75 75 V–12R1 V–12R2 V–12R4 V–12R8 MR1.8 MR3.8 MR2.8 Gb ROW DRIVERS MRT.8 V–12Rb MR4.8 GMM MRA.8 GMm 20A-3 MRB.8 ØRL N20.19 L5 N20.21 L3 N20.18 L6 N20.22 L2 N20.16 L7 N20.20 L1 N20.17 N21.19 MR1.4 68 N21.18 MR2.4 1.5K ØW N21.22 MRT.4 4.7K N21.20 MRA.4 N21.17 MRB.4 MS4 G2 N22.19 MR1.2 N22.18 MR2.2 N22.22 MRT.2 N22.16 MR4.2 N22.20 MRA.2 N22.17 MRB.2 MS2 G1 N23.19 MR1.1 V–12 MR2.1 68 MRT.1 bn N23.21 MR3.1 N23.18 N23.22 N23.16 MR4.1 N23.20 MRA.1 N23.17 MRB.1 V–12C gn N22.21 MR3.2 N25::28.18 • Bit arrays include an 8th row. (Spare, not shown.) N21.16 MR4.4 MSb yl N21.21 MR3.4 20A-1.5 bu MS8 G4 R L4 MS1 COLUMN DRIVERS MC15 V–12C MC14 ØDM MC13 ØDm 25A-3 MC12 ØR MC11 68 25A-2 ØW MC10 MC9 2.2K MC8 MC7 4.7K MC6 MC5 MC4 MC3 MC2 MC1 IME 86S Calculator Section: Memory Decoders, Drivers & Core Matrix Page: 18 Rendition: Mar 19, 2026 MC0 ØD ØD ØD ØD D C B A ØD ØD ØD ØD d c b a N28.22 N27.22 N26.22 N25.22 N28.21 N27.21 N26.21 N25.21 N28.20 N27.20 N26.20 N25.20 N28.19 N27.19 N26.19 N25.19 rd V–85 330 5µ 68K 1N751 5.1V (0) V–d 1K 100n 1K 2 4.7K T34.8 34A-4 R 3.3K 8~ 2 V–d 1 GCF G1 N34.18 GCF NPa.5 PA-0 REMOTE~ NR.14 NPa.3 P.10Nd NPa.4 NK.14 REMOTE T34.18 N34.3 2~ 4.7K 1~ 8 V+6 G2 8A-0 N8.16 N34.2 4~ 8 G4 QBEN~ N34.11 T34.19 8 T34.9 2.2n 68K 100 K 8~ V+6 6.8K GCF 6.8K N34.1 4 15K GCF T34.10 V+6 4.7K 6.8K 22K 100n 4.7K 10K 1~ G8 4.7K DP=ØD~ T34.20 4 V–d GCF 22K 8~ 47 T34.17 N34.4 4~ 34A-4 R T34.4 5 4~ 2~ 4 1 34A-4 R T34.3 2 2~ 8 2 4~ 34A-4 R T34.6 7 1~ 2 1 1~ T34.16 N34.5 8 T34.15 N34.6 4~ 2 1 8 D.P. lamp not present on 1015 T34.14 N34.7 4 0 2 4 6 8 1 3 5 7 9 2~ 1~ Mullard ZM1080 8 ND.** DA15 N25::28.** T34.13 N34.8 4 2~ 1 V–d N34.9 4 T34.1 T28.4 10K ØDd ØGD 1~ (0) T27.4 T26.4 T25.4 T28.3 T27.3 T26.3 T25.3 T28.2 T27.2 T26.2 T25.2 T28.1 T27.1 T26.1 T25.1 ØDD ØDD ØDD ØDC ØDC ØDC ØDC ØDB ØDB ØDB ØDB ØDA ØDA ØDA ØDA ØDc ØDb ØDa ØDd ØDc ØDb ØDa ØDd ØDc ØDb ØDa ØDd ØDc ØDb ØDa 1014 1013 1012 1011 1010 109 108 107 106 105 104 103 102 101 100 V+85A V+85 1015 T34.11 8 100n ØDD T34.12 2 4.7K ØGD 4.7K 8 100K N34.10 V+85A V+85A V+85A V+85A 4 2 1 IME 86S Calculator Section: Display Page: 19 Rendition: Mar 19, 2026 4• 47K 4• 1K V+85 N28.17 V+85 N27.17 N26.17 V+85 V+85 N25.17 V–85 N34.15 NPb.6 NPa.2 100µ 100V 75VAC 100µ 100V NPa.1 N25::28.17 V+85 2• 8.2 / 10W 19VAC NPb.3,4 4• 1000µ 25V NPb.9,10 TP.11 NPb.5 0.4A 4.7K 100µ 12V ** TP.4 POWER 6.8K 1K 47 10n NPa.14,15 470n 5 25V TH (on core board) NPa.13 TP.3 220VAC 50Hz N1::34.12 –12V 1000µ 12V 1K 4.7K black 1K 3.3K TP.1 3.3K TP.2 NPb.1,2 NPa.8,9,10 N1::34.13 NPa.11,12 N1::34.14 3.3K red 1K TP.9 NPb.7 10VAC 1000µ 12V 10n 100µ 12V 4.7K NPb.8 1.5K 1000µ 10V +6V TP.8 47 / 1W 680 680 680 TP.5 TP.6 680 N20::23.15 220 2.2K TP.7 2.2K IME 86S Calculator Rendition: Mar 19, 2026 to Core common V–6 V–6 100 680 Section: Power Supply Page: 20 470n 1000µ 12V NPa.6,7 470n 5µ 25V logic 1,T (–12V) (~ 90 KHz) ØM logic 0,F (0V, GND) 4 5 6 7 8 9 10 11 12 13 14 15 0 1 2 3 ØCn ØPCL No core read during ØN ØR ØRL ØA ØA1 ØW ØGS ØGD (~ 5.6KHz) ØD (~ 331 Hz) ØN ØDn Up: 14 Down: 2 Up: 15 Down: 1 DPC=0 Up: 0 Down: 0 Inter-number phase One digit phase Ø1R Procedure State Transition Unit 51409751: ØM = 89.3 KHz (11.2 µS) IME 86S Calculator Section: Timing Graph Page: 21 Rendition: Mar 19, 2026 Up: 1 Down: 15 Up: 2 Down: 14 AND-Form Gates OR-Form Gates +logic AND +logic OR bb A- t bb R- t –logic OR Wired Inputs (AND-form example) –logic AND bb A- t Distributed Gates (OR-form example) bb R- t bb A- t bb R- t Distributed Gate Separated on Pages (–logic OR example) bb A- t G~ G~ G~ bb R- t bb A-0 G~ R bb A-0 G~ R t R t 0 - 0 - 1 1K 22 22K 1.5 1.5K 22+ 22K V+6 2 2.2K 3 3.3K 4 4.7K 6 6.8K 47 47K R R This gate has 7 inputs in total. The perpendicular output line on a gate symbol indicates this is part of a distributed gate. One of the contributors provides the load R while the others are (typically) type-0 (no load R). AND-form with pull-up as input. R bbA-t Gate Identification R Gates are identified with a label of the form: or or bb gg - t bb . nn gg - t bb . tt gg - t where: bb nn tt gg t • Logic 0, F = 0V, GND Logic 1, T = –12V IME 86S Calculator Section: Modules - Gates Page: 22 Rendition: Mar 19, 2026 gg = A R Nv Nd NG BF PL PH PP = board [1::34] = enumeration = transistor number in IME schematic = gate type = optional type variation AND OR NOT NOT with diode & Rh NAND with 1 inverted input (gated NOT) buffer pulse 0 on 0-edge pulse 1 on 0-edge pulse 0 on 1-edge The black tab symbol indicates this circuit electrically has multiple sources. Pulsers Buffers bb.nn PL bb.tt BF bb.tt PH G RL Rb Cp 1 0 1 0 Rg G=1 G=0 G 1 0 Cp Ci Rg bb.tt Nd bb.tt NG Rh Ri Ci RL Rh tt diode not present if no Rh Ri tt Rg Cp bb.tt Rg Cp Rb RL 1.1 10 4.7n 5.9 - 2.2n 10 1.5 bb.tt RE 1.2 10 2.2n 19.13 - 10n 10 4.7 18.3 2.2 3.1 15 2.2n 30.12 - 2.2n 10 2.2 18.19 2.2 3.2 2.2g 1n 18.20 2.2 3.3 3.3 10n 10 3.4 3.3g 10n 10 3.5 3.3 10n 7.1 10 2.2n 8.1 6.8 2.2n 8.2 6.8 2.2n 8.3 6.8 1n 8.4 6.8 2.2n 8.5 6.8 2.2n 8.6 15 1n 8.7 15 1n 12.1 2.2 1n 12.2 10 1n 16.1 10 10n 16.2 22 4.7n 16.3 10g 4.7n 16.4 10 4.7n 17.1 6.8 10n 19.1 10 10n 19.2 4.7 10n Rb RL Rc RL 1 0 Rg Rh Ri Rb RL Ri Rb RL 6.8 15 2.2 15.1 6.8 15 4.7 bb.tt Ri Rb RL 6.8 15 10 15.2 6.8 15 4.7 1.11 6.8 15 4.7 1.10 tt Rb bb.tt Rg Cp Rb RL 8.8 - 4.7n 15 2.2 16.1 10 47n 22 4.7 bb.tt Rc 33.10 100Ω 33.11 100Ω 33.12 100Ω 33.13 100Ω • x = no RL, load R is external to module. • xx = no RL, load R is on other board. • xL = lamp driver. Ci Rh 6.8 4.7 15 4.7 15.3 6.8 15 4.7 2.10 6.8 15 4.7 4.7 6.8 15 2.2 15.4 4.7 10 4.7 6.3 4.7 15 2.2 470p 6.8 15 10 15.5 4.7 10 4.7 7.5 6.8 15 2.2 4.7 15 4.7 15.6 6.8 15 4.7 8.9 4.7 15 2.2 6.8 15 4.7 15.7 6.8 15 4.7 8.10 4.7 15 2.2 3.3 15.8 6.8 15 4.7 9.2 6.8 10 3.3 3.3 3.4 3.11 4.7 6.8 15 4.7 15.9 6.8 10 4.7 9.4 6.8 15 3.3 4.7 15 3.3 6.8 15 3.3 4.1 4.7 6.8 15 3.3 15.10 6.8 10 xx 9.6 4.2 4.7 6.8 15 2.2 15.11 6.8 10 4.7 10.1 4.3 6.8 15 xx 16.10 3.3 6.8 4.7 10.2 6.8 15 3.3 4.4 4.7 15 2.2 16.11 3.3 6.8 4.7 10.3 6.8 15 3.3 4.5 6.8 15 xx 16.12 3.3 6.8 4.7 10.4 6.8 15 3.3 4.6 6.8 15 2.2 16.13 4.7 6.8 10 x2.2 10.5 6.8 15 3.3 6.8 15 2.2 470p 18.1 3.3 6.8 15 4.7 10.6 6.8 15 3.3 6.8 15 2.2 18.2 2.2 6.8 xL 10.7 6.8 15 3.3 6.8 15 2.2 10.8 6.8 15 3.3 4.7 15 2.2 470p 10.9 6.8 15 3.3 4.7 10 2.2 470p 10.10 6.8 15 2.2 4.7 15 2.2 470p 11.1 6.8 6.8 15 3.3 4.7 10 2.2 470p 11.2 6.8 6.8 15 3.3 4.7 15 2.2 470p 11.3 6.8 15 3.3 4.7 10 2.2 470p 11.4 6.8 15 3.3 4.7 10 2.2 470p 11.5 6.8 15 3.3 6.8 15 3.3 470p 6.8 15 3.3 6.8 15 3.3 6.8 10 3.3 470p 5.1 3.3 5.8 5.10 4.7 6.8 15 2.2 18.4 5.11 4.7 6.8 15 2.2 19.7 4.7 10 4.7 19.8 3.3 3.3 3.3 4.7 6.10 6.8 6.8 15 2.2 19.9 6.11 2.2 3.3 10 xL 19.10 6.12 4.7 10 15 4.7 ** 19.11 8.7 6.8 15 3.3 19.12 9.1 6.8 10 xx 19.14 9.2 6.8 10 xx 19.15 6.8 10 2.2 470p 11.6 9.3 6.8 10 xx 29.10 4.7 15 2.2 11.9 9.7 6.8 15 6.8 30.1 4.7 15 2.2 9.8 6.8 15 6.8 30.13 1.5 6.8 2.2 12.5 9.9 6.8 15 6.8 30.14 4.7 15 2.2 12.6 6.8 15 xx 9.10 6.8 10 3.3 30.15 2.2 4.7 xx 12.7 6.8 15 3.3 6.8 15 xx 12.8 6.8 10 3.3 470p 3.3 10 2.2 12.9 6.8 15 3.3 4.7 15 3.3 12.10 6.8 15 3.3 6.8 15 2.2 13.1 4.7 6.8 15 3.3 3.3 4.7 ** 6.8 12.4 3.3 9.15 4.7 6.8 15 4.7 30.16 11.8 4.7 6.8 15 2.2 30.17 11.7 6.8 6.8 15 x3.3 30.18 12.3 6.8 15 1.5 470p 31.9 13.2 6.8 10 4.7 32.1 6.8 15 xx 13.7 4.7 6.8 15 3.3 13.3 4.7 10 4.7 32.10 4.7 15 2.2 13.8 4.7 6.8 15 3.3 13.4 4.7 10 4.7 32.11 6.8 10 2.2 13.9 4.7 4.7 15 3.3 13.5 6.8 10 4.7 32.12 4.7 6.8 15 x ** 29.9 4.7 10 15 xx 4.7 15 2.2 33.9 4.7 6.8 15 x ** 14.1 6.8 15 3.3 14.2 6.8 15 xx P.10 1.5 3.3 6.8 1 ** 14.3 6.8 10 3.3 IME 86S Calculator 14.4 4.7 10 3.3 6.8 10 3.3 Section: Modules - Pulsers, Buffers & Inverters Page: 23 Rendition: Mar 19, 2026 14.5 4.7 10 3.3 14.6 6.8 15 3.3 14.7 4.7 10 3.3 Capacitor Color Code wh yl og rd gn bu 220p 470p 1n 2.2n 4.7n 10n ** Special: • 6.12Nd: • 30.1Nv: • 30.18Nv: • 32.12Nd: • 33.9Nd: • P.10Nd: additional trim R parallel to Ri. 470p C from base to GND. 1n C from base to GND. external 220+2.2K load R. external 220+2.2K load R. 10n C from base to GND. Ci 1.13 5.12 • R in KΩ. Rh 1.12 3.12 tt tt Rb 4.7 Ci bb.tt Ri 1.9 2.11 33 Rb Ci bb.tt 2.9 bb.tt PP Cp bb.tt Nv RL bb.nn 1 0 bb.tt Nd tt tt RE Rb bb.tt Nv 1 0 Rb Active Gates Inverters 13.6 4.7 4m.1 3.3 4.7 ** 3.3 Flip-Flops Flip-Flop Base in Q Name Tbb.q q~ in RL Q in are input options. q & q~ are transistor numbers in IME schematic. Q~ Cf Cf RL Q~ Rf Rf Tbb.q Base Component Values 2• Rb Tbb.q~ Types S~ and R~ Cf Rb 2.2 10 470 22 2142 FC2 2.2 6.8 470 22 2642 FDP2,8 2.2 10 470 22 2142 FC4,8 2.2 6.8 470 22 2642 FDP4 2.2 10 470 22 2142 FTC1 2.2 10 220 15 2125 FD1 1 4.7 1 22 1412 FTC2 2.2 10 470 22 2142 FD2,4,8 1 4.7 1 22 1412 FTC4,8 2.2 10 470 22 2142 FØN 2.2 4.7 470 15 2445 FSC3 3.3 10 470 22 3142 FKP 3.3 10 - 22 3102 FSA,B * 6.8 - 10 FEX 2.2 6.8 1 22 2612 FST * 6.8 - 10 * 6.8 - 10 2.2 6.8 - 10 2601 FESH 3.3 10 470 15 3145 FSM 2.2 6.8 - 10 2601 FECL 2.2 6.8 470 22 2642 FCS 2.2 6.8 470 22 2642 Input Options Edge-Triggered F25,26 2.2 10 - 22 2102 FX1,Y1 2.2 10 470 22 2142 FX2,4 2.2 10 470 22 2142 Q FPa1 2.2 6.8 470 22 2642 FY2,4 2.2 10 470 22 2142 FPa2 2.2 6.8 470 22 2642 FX8,Y8 2.2 10 470 22 2142 FPb1,b2 2.2 6.8 470 22 2642 FPN 2.2 6.8 - 22 2602 FZ1 2.2 10 220 22 2122 2.2 10 470 22 2142 Q~ Rg Ck Edge-triggered Set & Reset. Ck SE~ Q goes 1 on 1-to-0 edge of SE~. Q goes 0 on 1-to-0 edge of RE~. RE~ Types SG~ and RG~ Rv Set & Reset, assert 1. Rg S Rv Ck Ck SG~ SK~ Gated Edge-triggered Set & Reset. Rg Q goes 1 if SG~=0 on 1-to-0 edge of SK~. Q goes 0 if RG~=0 on 1-to-0 edge of RK~. RK~ RG~ Q Q~ FZ2,4,8 FQM1,2,4,8 2.2 6.8 470 22 2642 FQB1,2,4 6.8 470 15 2645 FXR 2.2 6.8 470 22 2642 FYC 2.2 6.8 - 10 2601 2.2 F31 2.2 6.8 470 15 2645 F32 2.2 6.8 470 15 2645 FPPEX 2.2 6.8 470 22 2642 Fsr 2.2 10 470 22 2142 FGZ 2.2 6.8 470 22 2642 Special: FUD 2.2 6.8 470 22 2642 FSA,B,T,1,2,3,4 RL(Q)=1.5K, RL(Q~)=2.2K FOWP 2.2 10 470 22 2142 FX8,Y8 No Cf from Q~.C to Q.B FOW 2.2 10 - 15 2105 Type T Rv Collector Set & Reset. Rt Q goes 1 if SC~ = 0. Q goes 0 if RC~ = 0. Rv Ct SC~ Toggle Q on 1-to-0 edge of T~. T~ Q~ Type TG Rt Rv Rg TG~ IME 86S Calculator Rendition: Mar 19, 2026 Ct Input Component Value Codes Toggle. Rt Ct Q Section: Modules - Flip-Flops Page: 24 Flip-Flop 3142 FSP,Q Types SC~ and RC~ RC~ Rf 2622 FDP1 22 R~ Q~ RL 22 470 Rg Q goes 1 if S = 1. Q goes 0 if R = 1. Q Rb 220 10 Types S and R R Cf 6.8 3.3 Q goes 1 if SS~ = 0. Q goes 0 if RG~ = 0. Rs Rf 2.2 FEEN Types SE~ and RE~ Set & Reset, assert 0. Rs RL FC1 FS1,2,3,4 Input Options Immediate S~ Flip-Flop Ct Rd Ck TK~ Rt Gated Toggle. additional toggle gates Toggle Q if TG~=0 on 1-to-0 edge of TK~. SG,RG,SE,RE : T : TG : S, R : cRC a b c j k m n p r w x y z g R 3.3K 4.7K 6.8K 0 3.3K 4.7K 6.8K 10K 15K 4.7K 6.8K 10K 15K 6.8K C 470p 470p 470p 1n 1n 1n 1n 1n 1n 2.2n 2.2n 2.2n 2.2n 4.7n - cRC cRv - cRC cRv - gcRC cRv tcRC cRd - cRs cRv Rv 3 33K 4 47K 10 100K cRC –> Ck,Rg cRC –> Ct,Rt gcRC –> Ck,Rg; tcRC –> Ct,Rt cRd 4 6 1 Rd 4.7K 6.8K 10K cRs 4 6 1 Rs 4.7K 6.8K 10K N17 N16 1 PPMP 2 PPSR 3 PMM•(N~) 4 PMD•N 5 PEQ•(N~) 6 PSR 7 PPEQ 8 PPDV 9 PEQ•N 10 QMC 11 EXEC~ 12 V–12 13 GND 14 V+6 15 KNMs~ 16 KOP~ 17 KMPs~ 18 PPEX 19 MB 20 KDVs~ 21 KSRs~ 22 KEQs~ 1 PPMP 1 GR4INC~ 1 PPEQ 2 QMC 2 PEQ•(N~) 2 PPMP 3 QMd 3 PEQ•(N~)•PPEX 3 PPDV 4 QMB 4 QMd 4 PEQ•N 5 QMb 5 QMB 5 PEQ•(N~) 6 QMc 6 QMb 6 QMd 7 QMA 7 PSR 7 PMD•N 8 QM8 8 QMc 8 QMc 9 F32 9 QMA 9 QMC 10 EXEC~ 10 PMM•(N~) 10 QMA 11 ØN 11 QMC 11 QMb 12 V–12 12 V–12 12 V–12 13 GND 13 GND 13 GND 14 V+6 14 V+6 14 V+6 15 KOP~ 15 GAOP~ 15 GFG~ 16 KCs~ 16 GFG~ 16 GCL~ 17 PEQ•(N~)•PPEX 17 GCL~ 17 GTR~ 18 BSR~ 18 GTR~ 18 GAA~ 19 BDV~ 19 GAA~ 19 GFK~ 20 BMP~ 20 GBB~ 20 GBB~ 21 PSR 21 GGG~ 21 GGG~ 22 PPDV 22 PPEX 22 PPSR N15 N14 N13 N12 N11 NK NPa NPb 1 PPEQ 2 PPMP 3 PPDV 4 PEQ•N 5 ØGS 6 GR4INC~ 7 QMB 8 QMd 9 boxn 10 QMC 11 QMb 12 V–12 13 GND 14 V+6 15 boxS 16 GAOP~ 17 GAGG~ 18 GAA~ 19 GBB~ 20 GGG~ 21 GAAB~ 22 PPSR 1 QBa 2 ADDAA~ 3 QBb 4 GSL~ 5 GASUB~ 6 QBd 7 SRB7~ 8 P1~ 9 Ø1R 10 BSR~ 11 P2~ 12 V–12 13 GND 14 V+6 15 ØN 16 ZCLK 17 GAA~ 18 ØN~ 19 QBLP~ 20 QBB 21 FCS 22 GAAB~ 1 QBa 2 ADDAA~ 3 F31•nF32 4 QBb 5 ØD0 6 Z=0 7 ØGS 8 ØR 9 P1~ 10 GSEL~ 11 GZ~ 12 V–12 13 GND 14 V+6 15 BMP~ 16 GAA~ 17 GGG~ 18 GBB~ 19 QBLP~ 20 ZDOWN~ 21 GAGG~ 22 P4~ 1 K8s~ 2 K4s~ 3 K2s~ 4 K1s~ 5 TRC 6 KCs~ 7 KDLs~ 8 KSRs~ 9 KDRs~ 10 KNMs~ 11 KDPs~ 12 KNEGs~ 13 S 14 REMOTE 15 N 16 KDVs~ 17 KMPs~ 18 TCM 19 KEQs~ 20 KAAs~ 21 KBBs~ 22 KGGs~ 1 V+85 2 V–85 3 REMOTE~ 4 REMOTE 5 GCF 6 V–6 7 V–6 8 GND 9 GND 10 GND 11 V+6 12 V+6 13 thermistor 14 V–12 15 V–12 1 GND 2 GND 3 C 4 C 5 B 6 75VAC 7 10VAC 8 10VAC 9 V–12 10 V–12 N10 N09 N08 N07 N06 N05 N04 N03 N02 N01 1 GAAB~ 2 FCS 3 4 QBb 5 F31~ 6 F32 7 F32~ 8 GSRc~ 9 QBd 10 QBc 11 BDV~ 12 V–12 13 GND 14 V+6 15 BMP~ 16 GAA~ 17 GGG~ 18 GBB~ 19 QBLP~ 20 GSL~ 21 GSRz~ 22 GASUB~ 1 EXEC~ 2 QBEN~ 3 KCs~ 4 KDRs~ 5 F31 6 QBB 7 QBb 8 KDLs~ 9 CMT 10 QBd 11 QBc 12 V–12 13 GND 14 V+6 15 ØN~ 16 GAA~ 17 BSR~ 18 GGG~ 19 GBB~ 20 GSL~ 21 GSRz~ 22 GCL~ 1 F32 2 BSR~ 3 BMP~ 4 TCCLK 5 BDV~ 6 ØN 7 QBB 8 QBa 9 QBb 10 QBd 11 QBc 12 V–12 13 GND 14 V+6 15 QBEN~ 16 GCF 17 F31 18 TCCL~ 19 ZCLK 20 QBLP~ 21 FYC 22 F31~ 1 QBd 2 TC=DP 3 QBc 4 ØD15 5 DP=ØD 6 BDV~ 7 TCROLL 8 BMP~ 9 QBa 10 X=0~ 11 VP 12 V–12 13 GND 14 V+6 15 SRB7~ 16 BSR~ 17 REVCND 18 F31 19 F31•nF32 20 F32~ 21 F32 22 F31~ 1 LOW 2 ØN 3 SETOW 4 GSL~ 5 DP=ØD 6 ØR 7 EXEC~ 8 BMP~ 9 YINC 10 MB 11 KNMs~ 12 V–12 13 GND 14 V+6 15 BSR~ 16 GAA~ 17 GCL~ 18 GFG~ 19 GR4INC~ 20 P1~ 21 Z=0 22 KCs~ 1 ØN 2 SETOW 3 GAGG~ 4 ØA~ 5 BDV~ 6 XINC 7 GXY 8 YINC 9 ØD0 10 ØM 11 GAOP~ 12 V–12 13 GND 14 V+6 15 GZ~ 16 GASUB~ 17 FYC 18 ØA1 19 XROLL 20 GSH 21 GZ 22 YROLL 1 ØN 2 QBEN~ 3 RESETN 4 SETN 5 FCS 6 QM8 7 SN 8 ØGS 9 ØR 10 GTR~ 11 GAOP~ 12 V–12 13 GND 14 V+6 15 BLW 16 GSEL~ 17 GASUB~ 18 FYC 19 CMT 20 KNEGs~ 21 EXEC~ 22 STR 1 TCCLK 2 ØM 3 DP=ØD 4 TC=ØD~ 5 ØPCL 6 ZCL~ 7 SS 8 GZ 9 ØN 10 GSL~ 11 GSR~ 12 V–12 13 GND 14 V+6 15 ØN~ 16 CMT 17 EXEC~ 18 TV 19 KNMs~ 20 GSH 21 TC=ØD 22 DP=ØD~ 1 ØDD 2 ØDC 3 ØDB 4 ØDA 5 GSL~ 6 ØDd 7 ØDc 8 ØDb 9 ØDa 10 DP=ØD 11 EXEC~ 12 V–12 13 GND 14 V+6 15 GSEL~ 16 GSR~ 17 KDL