SC720 v1.0 Z80 SBC

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STD SC720 v1.0 Z80 SBC

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Update time： 2023-06-23 18:23:47

Creation time： 2023-05-28 18:27:18

Description

Z80 SBC/Motherboard with 80-pin RCBus expansion sockets

www.smallcomputercentral.com

Design Drawing

schematic diagram

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SC720 v1.0.0 CPU
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SC720 v1.0.0 Memory
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SC720 v1.0.0 SIO2
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SC720 v1.0.0 Compact Flash
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PCB

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SC720 v1.0 Z80 SBC
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	100nF	C1,C11,C16,C17,C2,C3,C4,C5,C6,C7,C8,C9,C10,C15,C12,C13,C14	CAP-RAD-2.54MM	17
2	22pF	C18,C19	CAP-RAD-2.54MM	2
3	100uF	C20,C21,C22	CAP-ELEC-RAD-2.54MM	3
4	1nF	C23	CAP-RAD-2.54MM	1
5	IN4001	D1	IN4001	1
6	Jumper_3x2	JP11,JP12	HDR-2X03-S-M-2.54MM	2
7	POWER	LED9	LED-3MM/2.54	1
8	RESET	LED11	LED-3MM/2.54	1
9	HDR_1X02_S_M_pretty	P4,P5	HDR-1X02-S-M-2.54MM	2
10	1k	R1,R2,R4,R3	RES-0.3	4
11	4k7	R13,R14,R15,R16,R17,R18	RES-0.3	6
12	10k	R19,R20,R21,R22,R23	RES-0.3	5
13	100k	R30,R28,R29,R24,R25,R26,R27	RES-0.3	7
14	1M	R31	RES-0.3	1
15	POWER	S3	DC_BARREL_JACK_PTH_SLOT_HOLE	1
16	RCBus Section Socket	S4	BP80-SOCKET	1
17	RCBus Card Socket	S5,S6	RC2014-HDR-2X40-S-F-R-2.54MM	2
18	POWER	ST1	SCREW-TERMINAL-X2	1
19	5 VOLTS	ST2	SCREW-TERMINAL-X2	1
20	POWER	SW1	SPDT_TOGGLE_SWITCH	1
21	RESET	SW3	TACTILE-PTH-SW-R/A	1
22	Z80 CPU	U1	PDIP-40-0.6	1
23	7805	U17	TO220H	1
24	DS1233-5+	U18	TO92 WIDE	1
25	7.3728MHz	X1	HC-49S	1
26	74HCT125	U11	PDIP-14	1
27	74HCT02	U16	PDIP-14	1
28	Write Enable	JP1	HDR-1X03-S-M-2.54MM	1
29	ROM select	JP2	HDR-1X03-S-M-2.54MM	1
30	ROM select	SW2	SPDT_SLIDE_SWITCH	1
31	RAM 512k	U2	PDIP-32-0.6	1
32	Flash 512k	U3,U4	PDIP-32-0.6	2
33	74HCT688	U5	PDIP-20	1
34	74HCT273	U6,U10	PDIP-20	2
35	74HCT157	U8	PDIP-16	1
36	74AHCT139	U7	PDIP-16	1
37	Clock A	JP3	HDR-1X03-S-M-2.54MM	1
38	Clock B	JP4	HDR-1X03-S-M-2.54MM	1
39	TX1	JP5	HDR-1X03-S-M-2.54MM	1
40	RX1	JP6	HDR-1X03-S-M-2.54MM	1
41	TX2	JP7	HDR-1X03-S-M-2.54MM	1
42	RX2	JP8	HDR-1X03-S-M-2.54MM	1
43	PwrA	JP9	HDR-1X02-S-M-2.54MM	1
44	PwrB	JP10	HDR-1X02-S-M-2.54MM	1
45	IEO	JP13	HDR-1X02-S-M-2.54MM	1
46	LED-3MM	LED1,LED2,LED3,LED4,LED5,LED6,LED7,LED8,LED10	LED-3MM/2.54	9
47	HDR_1x06_S_M	P1,P2	HDR-1X06-S-M-2.54MM	2
48	2k2	R5,R6,R7,R8,R9,R10,R11,R12	RES-0.3	8
49	8x1k	RN1	SIL-9	1
50	Serial Port A	S1	HDR-1X06-S-M-2.54MM	1
51	Serial Port B	S2	HDR-1X06-S-M-2.54MM	1
52	Z80 SIO/2	U9	PDIP-40-0.6	1
53	74HCT138	U15,U14	PDIP-16	2
54	IDE CONNECTOR	P3	HDR-IDC-2.54-2X20P	1
55	74HCT74	U12	PDIP-14	1
56	74HCT32	U13	PDIP-14	1