ZX Spectrum Diagnostic Card (4 x ROM)

Diagnostic ROM card for ZX Spectrum computers, featuring a 64 kB 27C512 EPROM. It enables running four different ROMs instead of the original built-in one.

I include a free EPROM with the card, pre-loaded with these programs:

1. Gosh Wonderful ROM – an alternative, improved ZX ROM.
2. ZX Diagnostics – diagnostic ROM
3. Retroleum DiagROM – diagnostic ROM
4. Ian Logan ZX Spectrum Test ROM

This ROM card is used for service diagnostics of ZX Spectrum computers: memory, ULA, keyboard, EAR/MIC, video, and sound. It also enables modern, alternative ZX BASIC ROMs, improved over the original 1982 version.

The card supports 27C512 (64 kB – 4 banks), 27C256 (32 kB – 2 banks), and 27C128 (16 kB – 1 bank) EPROM chips.
Compatible with:

• ZX Spectrum 48/+/128
• ZX Spectrum +2 (grey model)
• Timex 2048
• Harlequin 48/128
• Sizif-512

DOCUMENTATION:
https://mumio.dev/wp-content/uploads/2023/04/A1_ExtROM_PL.pdf

ROM DESCRIPTION AND MORE:
https://mumio.dev/?p=256