This is a replacement 16K ROM image to install on an Oric/Atmos mainboard to perform step-by-step test CPU/ULA/DRAM/VIA/PSG and associated circuitry. Includes schematic and PCB layout for optional external ROM/status LEDs/ULA replacement clock source and source code.

Diagnostic ROM and PCB

This is a replacement 16K ROM image to install on an Oric/Atmos mainboard to perform step-by-step test CPU/ULA/DRAM/VIA/PSG and associated circuitry. Includes schematic and PCB layout for optional external ROM/status LEDs/ULA replacement clock source and source code.

Download

The source, documentation, and other files can be downloaded below.

Diagnostics ROM

Diagnostic ROM image Ver 1.08j (ZIP 4KB)

Diagnostic ROM .ASM source Ver 1.08j (ZIP 23KB)

Documentation Ver 1.08 (PDF 883KB)

Diagnostics PCB

External ROM board Rev 1 (GIF 164KB)

EagleCAD Project For Diag PCB (ZIP 48KB)

Project from http://oric.signal11.org.uk/html/diagrom.htm

http://oric.signal11.org.uk/files/pub/diag-rom/OricDiagROM1-08.pdf