SYMBiFACE II:Rewriteable roms
From CPCWiki - THE Amstrad CPC encyclopedia!
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.
The re-writeable ROMs are stored on a static RAM. The static RAM is powered by a CR2032 battery to remember it's contents when the symbiface 2 is powered down.
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 meaningful numbers.
| INP &FD17 | show the current ROM (selected by #df00) between #4000 and #7fff. Now 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. |
