HardLabs

6502atty

bendooks·6502atty·kicad/6502atty.kicad_pcb

6502atty PCB layout, top view — open source AVR/Arduino board by bendooks

About the 6502atty PCB

6502atty is an open source AVR/Arduino PCB design by bendooks, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 112.5 × 124.5 mm, with 98 components from 32 distinct parts.

Its main chip is the ATMEGA164P-20P, from the AVR/Arduino family. Other key parts include the 74LS112, W65C02SXP, 74LS573, 74HC245 and 27C128. By type, the board carries 43 resistors, 24 capacitors, 12 ICs, 11 connectors, 5 diodes and 1 crystal.

It belongs with the retro computing designs in this gallery.

From the project

6502 SBC with ATMega controller

A 6502 SBC with an ATMega as a contoller and monitor for the 6502.

This is an initial commit as PCBs are off for manufacture and not been tested. This includes the prototype firmware and the first cut of the firmware code.

The firmware is currently in development. To build, you will need at-least avr-gcc and the relevant libraries and is currently only being tested on Linux (Debian). Once built, download to the ATMega using something like avrdude.

6502atty, from the project README
From the project README

Main components on the 6502atty

ATMEGA164P-20P74LS112W65C02SXP74LS57374HC24527C128KM62256CLP74LS0074LS0874LS138

6502atty bill of materials (BOM)

98 components, 32 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA164P-20P
ATmega164P-20P
U1
1
74LS112
U2
1
W65C02SXP
W65C02SxP
U3
2
74LS573
U4, U12
1
74HC245
U5
1
27C128
U6
1
KM62256CLP
U7
2
74LS00
U8, U9
1
74LS08
U10
1
74LS138
U11
1
18.341MHZ
18.341MHz
Y1
2
CONN_01X04_PIN
Conn_01x04_Pin
J1, J10
1
CONN_01X02_PIN
Conn_01x02_Pin
J2
1
CONN_02X03_ODD_EVEN
Conn_02x03_Odd_Even
J3
3
CONN_01X03_PIN
Conn_01x03_Pin
J4, J8, J11
1
CONN_01X06_PIN
Conn_01x06_Pin
J5
1
CONN_01X04_PIN
Conn_01x04_Pin
J6
2
CONN_01X10_PIN
Conn_01x10_Pin
J7, J9
1
HDSP-4850
BAR1
1
SW_Push
SW1
Show 12 more
QtyPartRefs
1
LED_Small_Filled
D1
4
RED
D2, D3, D4, D5
2
12PF
12pF
C1, C2
2
~
C3, C10
16
100NF
100nF
C4, C5, C6, C7, C9, C12, C13, C14 +8
4
100UF/16V
100uF/16V
C8, C11, C22, C23
6
1K
R1, R2, R3, R4, R5, R37
13
R
R6, R7, R8, R19, R20, R21, R22, R23 +5
2
4K7
R9, R18
17
330R
R10, R11, R12, R13, R14, R15, R16, R17 +9
3
1K
R39, R40, R41
2
R_NETWORK08
R_Network08
RN1, RN2

6502atty design files

The KiCad project lives in the bendooks/6502atty repository on GitHub; these links point at the commit this page was built from.

6502atty: common questions

What microcontroller does the 6502atty use?

The 6502atty is built around the ATMEGA164P-20P, from the AVR/Arduino family.

How big is the 6502atty PCB?

The 6502atty measures 112.5 × 124.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 6502atty?

98 components, from 32 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the 6502atty design files?

From the bendooks/6502atty repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the 6502atty design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which bendooks chose for the repository.

Can I test firmware for the 6502atty 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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