Monroe Diagnostic ROM
Monroe OC8820 · VRAM · DRAM
Memory diagnostic boot ROM for Monroe OC8820 (128K or 256K). Same march-test lineage as the ABC80 diagnostic.
A boot ROM for the Monroe OC8820 that tests VRAM (about 4K at $3000) then DRAM banks, detecting 128K vs 256K. It is adapted from the TRS-80 Diagnostic ROM (Dave Giller, Frank IZ8DWF, Adrian Black): march RAM test, stackless execution.
Burn monroeoc8800diag.bin or .hex. The on-screen banner is Monroe OC8820 TEST ROM. Source lives under the monroe git tree. ABC80 version: ABC80 Diagnostic ROM.