CPU SAP-1

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STD CPU SAP-1

Digital

License: Public Domain

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Update time： 2021-01-22 23:19:14

Creation time： 2020-07-23 14:27:09

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

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BOM

BOM download Purchase Parts

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