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
|OFF||OFF||Retroleum DiagROM v1.56|
|OFF||ON||Sinclair ZX Spectrum Test ROM|
|ON||OFF||Brendan Alford Diagnostics 0.36D|
|ON||ON||128 RAM Tester|
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