iz8dwf | Zaccaria Galaxia arcade repair #2. I decided I needed a diagnostic ROM. @iz8dwf | Uploaded November 2022 | Updated October 2024, 1 hour ago.
This is the second of four boards I've been sent for repair. This had even more faults than the previous one, unfortunately even two Signetics 2636 PVI were bad. However, I decided to start a diagnostic ROM project that will
help diagnosing these kind of arcade boards.

Zaccaria Astro Wars repair video:
youtube.com/watch?v=b4NDJMTLrw4

Zaccaria Galaxia #1 repair video:
youtube.com/watch?v=TVYFQGcRra4

Diagnostic github repo:
github.com/iz8dwf/zaccaria-2650-diag

Signetics 2650 CPU manual
datasheets.chipdb.org/Signetics/2650/2650UM.pdf

The macro assembler "AS"
http://john.ccac.rwth-aachen.de:8000/as/

DASMx disassembler
oocities.org/pclareuk/DASMx

Timeline:
00:00 - Welcome
00:32 - Physical inspection
01:03 - First power on
02:13 - Socket's nightmare
05:34 - Bad 74LS139
06:50 - First bad 2102
08:58 - Bad PVIs
10:10 - First bad 2x2114
12:48 - I need Diag ROM!
15:36 - Another bad 2x2114
17:19 - Another bad 2102
17:54 - Bad screen shifter
19:28 - Bad 2101
22:00 - Final tests