25-04-2021, 08:38 AM
Hi Someone,
I have had a look at the MW6545 and it is using the same crt controller chip that I used in my video card. As there wasn't enough space in any of the 3 monitor roms when I compiled the monitor I put a call to another block of code in another rom to initialise the registers of the controller. All other initialisation for the video is identical as it is memory based video. The block of code to initialise the registers is about 20 bytes and is easy to setup.
I Haven't come across the DG750 I/O card if you have any info I would be interested in having a look at it.
I haven't given up on repairing the 3 drives that I killed, so far I have replaced numerous caps that couldn't take the ripple I think.
I have the stepping and head loading working but the read/write still doesn't work.
If I get them going I can unlock all the treasures I have in boxes of 8" disks.
If you need help patching the roms for you system let me know.
The D000 - D7FF is identical or near identical to the original so the disassembly listing should match.
The POJ (Power On Jump) still launches the monitor at D000.
Cheers Bruce
I have had a look at the MW6545 and it is using the same crt controller chip that I used in my video card. As there wasn't enough space in any of the 3 monitor roms when I compiled the monitor I put a call to another block of code in another rom to initialise the registers of the controller. All other initialisation for the video is identical as it is memory based video. The block of code to initialise the registers is about 20 bytes and is easy to setup.
I Haven't come across the DG750 I/O card if you have any info I would be interested in having a look at it.
I haven't given up on repairing the 3 drives that I killed, so far I have replaced numerous caps that couldn't take the ripple I think.
I have the stepping and head loading working but the read/write still doesn't work.
If I get them going I can unlock all the treasures I have in boxes of 8" disks.
If you need help patching the roms for you system let me know.
The D000 - D7FF is identical or near identical to the original so the disassembly listing should match.
The POJ (Power On Jump) still launches the monitor at D000.
Cheers Bruce