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AW: Re: A patch for AT mode of the Novag Sapphire
Hi Mychess!
Similar to your Sapphire patch, I have now also made a patch for the Diamond, which shouldn't be particularly difficult because the two programs are practically identical (apart from the hardware control). The easiest task was to adjust the addresses. Only some values (registers?) were different on the Diamond than on the Sapphire, so I changed those accordingly (these values are ff62/ff65/ff67 in the Diamond but ff60/ff63/ff65 in the Sapphire). Here is an assembly list of my changes - maybe you can take a look at these changes and let me know if everything is ok? I've also attached the modified Diamond ROM with exactly these changes - I've already tried it here in MessNew and it seems to work correctly. Regards, Franz Code:
changed from: 0E9A: F928 mov.b #h'28, r1l 0E9C: 3867 mov.b r0l, @h'ff67 0E9E: 3965 mov.b r1l, @h'ff65 to: 0E9A: 5E00 7568 jsr h'7568 0E9E: 0000 nop changed from: 6090: FE00 mov.b #h'00, r6l 6092: 108D shal.b r5l 6094: 1205 rotxl.b r5h to: 6090: 0D50 mov.w r5, r0 6092: 5E00 7540 jsr h'7540 changed from: 6CA0: 4A0A bpl h'6cac 6CA2: 7902 FBF6 mov.w #h'fbf6, r2 6CA6: 6B00 FF62 mov.w @h'ff62, r0 6CAA: 2965 mov.b @h'ff65, r1l to: 6CA0: 4A04 bpl h'6ca6 6CA2: 5E00 7534 jsr h'7534 6CA6: 5E00 754E jsr h'754e 6CAA: 0000 nop added: 7534: 7902 FBF6 mov.w #h'fbf6, r2 7538: 6B00 FF62 mov.w @h'ff62, r0 753C: 2965 mov.b @h'ff65, r1l 753E: 5470 rts 7540: 5E00 754E jsr h'754e 7544: 0D05 mov.w r0, r5 7546: FE00 mov.b #h'00, r6l 7548: 108D shal.b r5l 754A: 1205 rotxl.b r5h 754C: 5470 rts 754E: 6DF5 mov.w r5, @-r7 7550: 0D05 mov.w r0, r5 7552: 1105 shlr.b r5h 7554: 130D rotxr.b r5l 7556: 1105 shlr.b r5h 7558: 130D rotxr.b r5l 755A: 1105 shlr.b r5h 755C: 130D rotxr.b r5l 755E: 1105 shlr.b r5h 7560: 130D rotxr.b r5l 7562: 1950 sub.w r5, r0 7564: 6D75 mov.w @r7+, r5 7566: 5470 rts 7568: F928 mov.b #h'28, r1l 756A: A808 cmp.b #h'08, r0l 756C: 4502 bcs h'7570 756E: F901 mov.b #h'01, r1l 7570: 3867 mov.b r0l, @h'ff67 7572: 3965 mov.b r1l, @h'ff65 7574: 5470 rts
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