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STD CPU SAP-1
CPU SAP-1
License
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Update time：
2021-01-22 23:19:14
Creation time：
2020-07-23 14:27:09
Description
Description
The SAP-1 (Simple As Possible) CPU design, as implemented by Ben Eater.
All logic components use 7400 "LS" series ICs, and combinational logic using EEPROM ICs.
v1.1 includes some modifications to Ben's reference design within:
Clock, RAM, MAR, Control, and a major variant to the BCD Output due to using a combined 4-digit 7-segment display module.
v1.2 includes only the removal of the DIP switches and other controls for manual programming, modifications to support my "SAP-1 4-Bit Programming Panel"
Design Drawing
Design Drawing
schematic diagram
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Clock
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Reg A
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Reg B
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ALU+Flags
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RAM
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MAR
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Output
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Control
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 1M | R3 | RES-ADJ-TH_3P-L9.5-W9.5-P2.50-L_3386P | 1 |
| 2 | 100nF | C5,C2 | CAP-TH_L5.0-W2.5-P5.08-D0.7 | 2 |
| 3 | 0.1uF | C4,C7 | CAP-TH_L5.0-W2.5-P5.08-D0.7 | 2 |
| 4 | 555 | U2,U3,U1,U34 | DIP8 | 4 |
| 5 | K2-3.6×6.1_SMD | KEY1,KEY2,KEY3 | KEY-SMD_2P-L6.2-W3.6-LS8.0 | 3 |
| 6 | Clock LED | LED1 | LED0603_RED | 1 |
| 7 | SW-SPDT | SW1 | SW-SPDT- | 1 |
| 8 | 1uF | C1 | CAP-TH_BD4.0-P1.50-D0.8-FD | 1 |
| 9 | 1M | R5 | RES-TH_BD2.2-L6.5-P10.50-D0.6 | 1 |
| 10 | 1K | R6,R4,R1,R2,R7,R41,R93,R54,R55,R92,R91,R94,R61,R71 | RES-TH_BD3.0-L9.5-P13.50-D0.6 | 14 |
| 11 | 0.01uF | C3,C6,C8 | CAP-TH_L12.5-W5.0-P10.00-D0.6 | 3 |
| 12 | 220 | R8,R16,R14,R13,R12,R11,R10,R9,R15,R17,R19,R20,R21,R22,R23,R24,R18,R32,R30,R29,R28,R27,R26,R25,R31,R39,R38,R37,R36,R40,R34,R88,R89,R35,R33,R43,R44,R45,R46,R47,R48,R49,R42,R53,R52,R51,R50,R56,R57,R58,R59,R86,R85,R84,R83,R82,R81,R80,R79,R78,R77,R76,R75,R87,R73,R72,R70,R69,R95,R96,R68,R63,R67,R66,R65,R64,R74 | RES-TH_BD2.2-L6.5-P10.50-D0.6 | 77 |
| 13 | 74LS08 | U5,U49 | DIP14 | 2 |
| 14 | 74LS32 | U6 | DIP14 | 1 |
| 15 | 74LS04 | U4,U29,U28,U45,U46 | DIP14 | 5 |
| 16 | 74LS245 | U7,U12,U13,U32 | DIP20 | 4 |
| 17 | LED-0603_R | LED9,LED8,LED7,LED6,LED5,LED4,LED3,LED2,LED10,LED12,LED13,LED14,LED15,LED16,LED17,LED11,LED25,LED24,LED23,LED22,LED21,LED20,LED19,LED18,LED27,LED31,LED30,LED78,LED33,LED29,LED28,LED26,LED32,LED77,LED34,LED41,LED40,LED39,LED38,LED37,LED36,LED35,LED43,LED47,LED46,LED42,LED45,LED44,LED48,LED49,LED50,LED51,LED53,LED62,LED63,LED64,LED72,LED65,LED66,LED67,LED80,LED79,LED68,LED76,LED61,LED54,LED55,LED56,LED57,LED58,LED59,LED60,LED69,LED70,LED75,LED74,LED73,LED71 | LED0603_RED | 78 |
| 18 | 74LS173 | U8,U9,U10,U11,U14,U15,U47,U31,U37,U38 | PDIP-16 | 10 |
| 19 | 74LS245N | U16,U23 | DIP20 | 2 |
| 20 | 74LS283 | U18,U17 | DIP16 A | 2 |
| 21 | 74LS86 | U19,U20 | DIP14 | 2 |
| 22 | 74LS02 | U48 | DIP14 A | 1 |
| 23 | 74LS189 | U21,U22 | 74LS189 | 2 |
| 24 | 74LS157 | U26,U25,U24,U30 | DIP16 | 4 |
| 25 | DS-08RP_C319056 | SW2 | SW-TH_DS-08XP | 1 |
| 26 | 1k | R90 | RES-TH_BD2.2-L6.5-P10.50-D0.6 | 1 |
| 27 | 74LS00 | U27,U42 | DIP14 | 2 |
| 28 | SPDT | S1,S2 | DIP | 2 |
| 29 | DS-04RP_C319060 | SW3 | SW-TH_DS-04XP | 1 |
| 30 | 74LS161 | U33,U40 | DIP16 A | 2 |
| 31 | 7-SEGMENT-4DIGIT-YOUNGSUN | LED52 | 7-SEGMENT-4DIGIT-YOUNGSUN | 1 |
| 32 | 10K | R60 | RES-TH_BD3.0-L9.5-P13.50-D0.6 | 1 |
| 33 | AT28C16 | U35,U43,U44,U50 | DIP24-600 | 4 |
| 34 | 100K | R62 | RES-TH_BD2.2-L6.5-P10.50-D0.6 | 1 |
| 35 | 74LS107 | U36 | DIP14 | 1 |
| 36 | 74LS139 | U39 | DIP16 | 1 |
| 37 | 74LS138 | U41 | DIP16 | 1 |
| 38 | 74LS32 | U52 | DIP-14_3D | 1 |
| 39 | 74LS08 | U51 | DIP-14_3D | 1 |
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