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STD 6502 Single Board Computer

6502 Single Board Computer

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License

TAPR Open Hardware License

License: TAPR Open Hardware License

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Update time: 2024-09-03 13:21:51
Creation time: 2024-06-06 17:42:21
Description

Description

6502 based SBC Most of the design from Grant searle original design.

 

The original circuit was produced by Pennuto73, thanks for the orignal work.

 

I have Added a jumper to allow 256k ROM giving access to two pages of ROM with a single jumper, also

re-connected the RTS line to aid with hardware connection to a PC.

 

I also had issues with getting the Xtal to work with the LS series, so I adjusted the 2k2 resistors and switched to

using HCT series. In theory this would also hel with using a 65c02 chip.

 

The circuit layout was created by me with improved silk screen markings to help make sure things like the FTDI are connected the right way!

 

 

Design Drawing

Design Drawing

schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 A14 J4 HDR-TH_3P-P2.54-V-F-4 1 C18164975
2 A15 J5 HDR-TH_3P-P2.54-V-F-4 1 C18164975
3 RESET SW1 TACTILE-PTH-EZ CZ 1
4 POWER D1 LED-TH_BD3.0-P2.54-RD 1
5 NE555 U1 PDIP-8_L9.6-W6.4-P2.54-LS7.9-BL-1 1 C2859604
6 100n C9,C3,C4,C5,C6,C7,C8 C1 7
7 10u C10,C1 CAP-D6.3-F2.5 2
8 47k R10 R3 1
9 1M R1 R3 1
10 27128/512 U4 DIP28-600 1
11 6502CPU U5 PDIP-40 1
12 10k R2,R3 R3 2
13 2K2 R5,R6,R7 R3 3
14 270P C2 C1 1
15 FTDI H1 HEADER 1X6 1
16 USB POWER J1 1X2 PIN HEADER 2.54MM 1
17 Header-Male-2.54_2x18 P1 HEADER-MALE-2.54_2X18 1 E50980
18 62256P U2 DIP28-600 1
19 6850 U3 DIP24-600 1
20 1.8432MHz X1 HC-49S 1
21 74LS00 U6 DIP14 1
22 74LS04 U7 DIP14 1

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