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65C02 Computer

rprouse·65C02_SBC·Schematics/65C02_Computer/65C02_Computer.kicad_pcb

65C02 Computer PCB layout, top view — open source AVR/Arduino board by rprouse

About the 65C02 Computer PCB

65C02 Computer is an open source AVR/Arduino PCB design by rprouse, published on GitHub under the MIT license. It is a 2-layer board measuring 203.2 × 149.9 mm, with 62 components from 42 distinct parts.

Its main chip is the ATtiny4313-PU, from the AVR/Arduino family. Other key parts include the 74HC21, 74HC00, 74HC02, NE555 and 65C51N. By type, the board carries 17 capacitors, 13 resistors, 12 ICs, 11 connectors, 4 diodes and 2 crystals.

It belongs with the dev boards & breakouts and retro computing designs in this gallery.

From the project

Assembly code for my 8-bit 65C02 based breadboard computer

This documentation provides all the information regarding my variant of BE6502 computer:

- Differences between the builds - Getting started with the PCB.

This section describes details of each deviation from original BE6502 design.

More of a cosmetic thing, but I liked the idea of computer running automatic reset on power-up. The added appeal was that the circuitry is actually copied from the original C64, which makes it instantly 1000x cooler :) You can read more on that here: Dirk Grappendorf's 6502 project - RESET

Main components on the 65C02 Computer

74HC2174HC0074HC02NE55565C51NFT230XS65C02S28C25662256ATtiny4313-PU65C22S

65C02 Computer bill of materials (BOM)

62 components, 42 distinct parts.

QtyPartRefs
1
74HC21
U1
1
74HC00
U2
1
74HC02
U3
1
NE555
U4
1
65C51N
U5
1
FT230XS
U6
1
65C02S
U7
1
28C256
U8
1
62256
U9
1
ATtiny4313-PU
U10
2
65C22S
U11, U12
1
1MHz
X1
1
1.8432MHz
X2
1
CLK Jumper
J1
1
Optional UART Port
J2
1
USB_B_Micro
J3
1
USB_B
J4
1
Power Connector
J5
1
Mini-DIN-6
J6
1
Expansion port
J7
Show 22 more
QtyPartRefs
1
AVR-ISP-10
J8
1
VIA2PA
J9
1
VIA2PB
J10
1
LCD Connector
J11
1
10K
RV1
1
RESET
SW1
1
PWR
D1
1
TX
D2
1
RX
D3
1
BLINK
D4
1
Ferrite_Bead_Small
FB1
12
0.1uF
C1, C2, C3, C4, C5, C7, C12, C13 +4
1
10uF
C6
1
10nF
C8
2
47pF
C9, C10
1
1000uF
C11
1
1M
R1
1
47K
R2
1
10K
R3
2
27
R4, R5
4
4K7
R6, R7, R8, R13
4
270
R9, R10, R11, R12

65C02 Computer design files

The KiCad project lives in the rprouse/65C02_SBC repository on GitHub; these links point at the commit this page was built from.

65C02 Computer: common questions

What microcontroller does the 65C02 Computer use?

The 65C02 Computer is built around the ATtiny4313-PU, from the AVR/Arduino family.

How big is the 65C02 Computer PCB?

The 65C02 Computer measures 203.2 × 149.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 65C02 Computer?

62 components, from 42 distinct parts. The full bill of materials is listed on this page.

Where can I download the 65C02 Computer design files?

From the rprouse/65C02_SBC repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the 65C02 Computer design in my own project?

Yes, under the terms of its MIT license, which rprouse chose for the repository.

Can I test firmware for the 65C02 Computer without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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