This article decribes, how to map the rewriteable ROMs of the SYMBiFACE II card into the ram area, so that you can change its content.
Mechanisms
Please note, that the following commands ignore all values. So it doesn't matter, what you "out". When you "inp" you won't get any senseless numbers.
| INP &FD17 | show the current ROM (selected by #df00) between #4000 and #7fff. No it can be read and rewritten. |
| OUT &FD17 | disable the previouse mentioned ROM write mode. |
| OUT &FD11 | disable all SYMBiFACE II Roms. You won't see any additional ROMS anymore, only the CPCs' inbuilt ones. |
| INP &FD11 | enable the SYMBiFACE II roms. |