ZX External ROM
This is a ZX External ROM with a W27C512 ROM loaded with 4 diagnostic tools.
Each ROM can be selected by using the DIP switch.
The W27C512 is electrically erasable so can be reprogrammed with other ROMs using a suitable programmer like the TL866
DIP Switch:
| 1 | 2 | ROM |
|---|---|---|
| OFF | OFF | Retroleum DiagROM v1.71 |
| OFF | ON | fficial Sinclair ZX 48k Spectrum Test ROM |
| ON | OFF | Official ZX Spectrum 128k and 128k +2 Test ROM |
| ON | ON | Brendan Alford Diagnostics 0.36D
|
The board features a reset button, as well as a enable/disable button.
Setting to disable will allow booting from the ZX Spectrum and disable the external ROM.
Works with the ZX Spectrum 16k / 48k / 48k + / 128k / + 2 / +2A / +2B
