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STD 6502 Single Board Computer
6502 Single Board Computer
License
TAPR Open Hardware License
License: TAPR Open Hardware LicenseMode:
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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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