My C3A system has finally booted from the floppy disk!!
I used my homebrewed 6502 logic analyser to find it was stuck trying to move the head to track zero.
Then used my saleae logic analyser on the 470 disk controller find the "step" signal was toggling
on/off at the PIA but not on the 50 pin disk interface. That lead me right to the burned out 7417 hex buffer that
drives the step signal.
I just happened to have a 7407 in the junk bin and it's a pin compatible alternative for the 7417.
With that installed the system booted from floppy. Then I realized how little I remember about how
OS65D works. I'm going to have to get out the manual.
I can now go thru my pile of diskettes and find out what I have. I know a few folks were waiting for a copy of my
FORTH diskette. As soon as I figure out how OS65D works and can copy it I will share.
john
OSI C3A (finally) Booting from Floppy
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OSI C3A (finally) Booting from Floppy
C3A-8P 510CPU, 470Disk Controller, 527 memory (3x=48k), dual 8" floppy
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Re: OSI C3A (finally) Booting from Floppy
Great to see you have this booting John.
I hope you have equal success reading your floppies.
Mike
I hope you have equal success reading your floppies.
Mike
600RevB:16K,2MHz,64x32,470,CEGMON
SuperKit:502,540B,542B,CEGMON, 8" and 5" FDDs
Cards:PE IO,6522 D-A-D, AY3-8910,ProgramGraphics,Color,UK101
WIP:HexDOS,FDD Emulator
SuperKit:502,540B,542B,CEGMON, 8" and 5" FDDs
Cards:PE IO,6522 D-A-D, AY3-8910,ProgramGraphics,Color,UK101
WIP:HexDOS,FDD Emulator
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Re: OSI C3A (finally) Booting from Floppy
Great to hear!
Also, it would be awesome if you are able to make images of the Pegasus software disks, particularly FBASIC.
Also, it would be awesome if you are able to make images of the Pegasus software disks, particularly FBASIC.