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Posted By

Crown
on 2004-05-16
08:52:45
 Re: XAA!

$ff7f and $ff80 is an identifier code, it is $2a for the revision 4 PAL ROM and $5E for the revision 5 PAL ROM. There is also a revision 3 PAL ROM the code value for that is $F1... There are some minor differences beetween the ROM versions....
Also there is two NTSC ROM version known to exist the codes are $90 for Rev 4 and $C4 for Rev5.
The second byte $ff80 is most likely can be decomposed liked this
7th bit PAL/NTSC 1 means PAL
6-4th NC
3-0th Revision number.
The actual ROM images can be found here:
http://www.nic.funet.fi/pub/cbm/firmware/computers/plus4/index.html



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