Posted By
MCes
on 2021-04-07
11:31:01
 |  Drive 1551: 28-pin MOS6523T replacement tentative
@crock asked to me if I developed a replacement for the TRIport used into the 1551 cartridge, a 28pin MOS6523T (MOS6523A-28).
The consequence is a tentative to do it!
 
Now I have to develop the CPLD internal structure, and for testing it I need to know if (and which) speed loaders for 1551 exist.
Does anyone know them?
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Posted By
crock
on 2021-04-07
13:27:10
 | Re: Drive 1551: 28-pin MOS6523T replacement tentative
Ooh, so excited! Happy to support any testing required as I think I have at least two 1551's with a failed 6523.
I also think I have a test program for the paddle that checks the ports of the 6523 fo the correct responses.
I'll dig it out if it's useful.
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Posted By
MCes
on 2021-04-08
09:25:24
| Re: Drive 1551: 28-pin MOS6523T replacement tentative
The CPLD has some limitation, so I have to make some simplification.
The correctness of this simplifications has to be tested on the ground, obviously with the standard load/save
but lso with the 1551 speed loaders (if they exist) that could use in a different way the HW protocol.
So the question is: are there any speed loaders for the 1551 drive? Which?
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Posted By
MCes
on 2021-04-09
06:51:12
| Re: Drive 1551: 28-pin MOS6523T replacement tentative
@Retroshire
Thanks a lot!
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