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.
The source, documentation, and other files can be downloaded below.
- Diagnostic ROM images Ver 1.08k (ZIP 7KB)
- Diagnostic ROM .ASM source Ver 1.08k (ZIP 23KB)
- Documentation Ver 1.08 (PDF 2.5M)
2023/05/10: ROM revision 1.08k corrects a small initialization bug with the VIA chip.
Also provided: Standard (50Hz) version and 60Hz screen compatible version, both within the same .ZIP file
Source, documentation and pictures © 2009-2023 Mike Brown. Visit the website at http://oric.signal11.org.uk for the latest version and contact details.