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6500-1-brain dumper

schlae·6500-1-brain-dumper

6500-1-brain dumper PCB layout, top view — open source AVR/Arduino board by schlae

About the 6500-1-brain dumper PCB

6500-1-brain dumper is an open source AVR/Arduino PCB design by schlae, published on GitHub. It is a 2-layer board measuring 76.2 × 76.2 mm, with 30 components from 23 distinct parts.

Its main chip is the ATmega644PA-P, from the AVR/Arduino family. By type, the board carries 11 connectors, 7 resistors, 6 capacitors, 3 transistors, 1 IC and 1 crystal.

It belongs with the usb & debug tools designs in this gallery.

From the project

6500/1 microcontroller ROM dump board

Do you have a 6500/1 microcontroller made by MOS, Rockwell, or NCR? (and possibly others) Do you want to dump the contents of the ROM? Here's a board for you!

This design is derived from work by Jim Brain documented here with design files here.

The original design was built on a breadboard. I've turned this into a simple PC board to save you the effort of wiring it up. Along the way, I ported the code to another MCU (ATmega644) mostly because that is what I had. I also edited the code to make it slightly more reliable by putting out more clock cycles while RESET# is held low. (Although it…

6500-1-brain dumper, from the project README
From the project README

Main components on the 6500-1-brain dumper

ATmega644PA-P

6500-1-brain dumper bill of materials (BOM)

30 components, 23 distinct parts.

QtyPartRefs
1
ATmega644PA-P
U1
2
2N3904
Q1, Q2
1
2N3906
Q3
1
16MHz
Y1
1
6500/1
J1
1
SERIAL
J2
1
+5V
J3
1
+10V
J4
2
GND
J5, J11
1
SCOPE
J6
1
RESET
J7
1
EN_10V
J8
1
RST_LOW
J9
1
CLOCK
J10
1
RESET
SW1
2
20pF
C1, C2
2
0.1uF
C3, C4
1
10uF
C5
1
DNI
C6
2
4.7K
R1, R3
Show 3 more
QtyPartRefs
1
1K
R2
3
10K
R4, R5, R7
1
30
R6

6500-1-brain dumper design files

The KiCad project lives in the schlae/6500-1-brain-dumper repository on GitHub; these links point at the commit this page was built from.

6500-1-brain dumper: common questions

What microcontroller does the 6500-1-brain dumper use?

The 6500-1-brain dumper is built around the ATmega644PA-P, from the AVR/Arduino family.

How big is the 6500-1-brain dumper PCB?

The 6500-1-brain dumper measures 76.2 × 76.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 6500-1-brain dumper?

30 components, from 23 distinct parts. The full bill of materials is listed on this page.

Where can I download the 6500-1-brain dumper design files?

From the schlae/6500-1-brain-dumper repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the 6500-1-brain dumper design in my own project?

The repository has no license, so all rights stay with schlae. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the 6500-1-brain dumper 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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