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Nivag Swerdna
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Nivag Swerdna
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March 5th, 2021,
05:45 AM
Nivag Swerdna
replied to a thread
PET 2001 Keyboard Issue
in
Commodore
Hello The testers often employ simple checksums... e.g. Adding up every byte and showing the remainder; such a scheme will fail to detect errors...
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8 replies | 77 view(s)
February 21st, 2021,
02:34 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
Wow! Well I wasn't expecting that! 74..74 devices are notorious in their failure like ...161s etc but I was NOT looking in that part of the circuit!...
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177 replies | 6883 view(s)
February 19th, 2021,
04:33 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
Always. :D The only other thing I wondered about is... if the row/col address muxing is the problem... then maybe we need to see MUXA in the...
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177 replies | 6883 view(s)
February 18th, 2021,
04:40 PM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
Likewise welcome! Don't let the initial moderation posting delay put you off, it wears off after a bit. In the super slow PET the timing is much...
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177 replies | 6883 view(s)
February 18th, 2021,
09:08 AM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
Back to normal; that gave me the jitters... need to prepare myself for the day I have real monitor issues!
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173 replies | 10970 view(s)
February 18th, 2021,
06:31 AM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
16vac
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173 replies | 10970 view(s)
February 18th, 2021,
05:28 AM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
OK so you look away for a second and it stops working... this time I have total monitor failure... and my thoughts turned to Horizontal Output...
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173 replies | 10970 view(s)
February 18th, 2021,
02:38 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
MUXA looks like it is ON too early? Row gets latched on nRAS -ve transition; Col on nCAS -ve transition so the two 'halves' of the address which...
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177 replies | 6883 view(s)
February 17th, 2021,
05:24 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
I hadn't spotted that! Quite interesting... The logic for RA1..RA6 is from the counters H6 and H9 but RA7 is derived differently... I lose track......
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177 replies | 6883 view(s)
February 17th, 2021,
01:30 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
The refresh seems to be counting in 2s.... I don't think I would have expected that!
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177 replies | 6883 view(s)
February 11th, 2021,
04:43 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
I'm looking forward to seeing FA0..FA6, nRAS, nCAS,MUXA,CLK1,... BTW Greg, I admire your efforts I have a selection of Logic Analysers but rarely...
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177 replies | 6883 view(s)
February 9th, 2021,
04:17 PM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
Funny. I seem to remember doing that myself... in 1987
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177 replies | 6883 view(s)
February 7th, 2021,
09:22 AM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
Thanks. I ordered some just in case. Interestingly I changed the 74LS244s at G5 and G6 for modern ones and the driven signals in the $E8xx region...
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173 replies | 10970 view(s)
February 7th, 2021,
02:04 AM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
W65C21N or W65C21S ?
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173 replies | 10970 view(s)
February 6th, 2021,
12:34 PM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
>>>Was this replacement PIA in place with the machine working? Yes and No. It did work but with the H3 (Editor) ROM removed as I was using my...
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173 replies | 10970 view(s)
February 6th, 2021,
11:48 AM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
OK... so I have some problem in the $E000-$EFFF region and I cannot really understand it. I removed ALL RAM and ALL ROM and enabled the NOPulator. ...
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173 replies | 10970 view(s)
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About Nivag Swerdna
Basic Information
About Nivag Swerdna
Location:
London, UK
Occupation:
Technical Consultant - Computing - Distributed and Embedded Systems
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Total Posts
161
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0.69
General Information
Last Activity
Yesterday
05:05 PM
Join Date
July 17th, 2020
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