Register
Help
Remember Me?
What's new?
Forum
New Posts
FAQ
Calendar
Community
Groups
Albums
Member List
Forum Actions
Mark Forums Read
Quick Links
Today's Posts
View Site Leaders
Blogs
Articles
Advanced Search
Member List
Nivag Swerdna
If this is your first visit, be sure to check out the
FAQ
by clicking the link above. You may have to
register
before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.
Nivag Swerdna
Senior Member
Find latest posts
Find latest started threads
View Articles
View Blog Entries
Mini Statistics
Join Date
July 17th, 2020
Last Activity
Today
02:59 AM
Blog Entries
0
Recent Visitors
The last 6 visitor(s) to this page were:
Agent Orange
,
alejack12001
,
AndyG
,
dabone
,
lowen
,
Thekreit66
This page has had
1,018
visits
Tab Content
Nivag Swerdna's Activity
About Me
Tab Content
All
Nivag Swerdna
Friends
Photos
New Activity (
)
Please reload this page to view the 200+ new activity items that have been created.
Older Activity
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!...
see more
177 replies | 6796 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...
see more
177 replies | 6796 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...
see more
177 replies | 6796 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!
see more
173 replies | 10932 view(s)
February 18th, 2021,
06:31 AM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
16vac
see more
173 replies | 10932 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...
see more
173 replies | 10932 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...
see more
177 replies | 6796 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......
see more
177 replies | 6796 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!
see more
177 replies | 6796 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...
see more
177 replies | 6796 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
see more
177 replies | 6796 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...
see more
173 replies | 10932 view(s)
February 7th, 2021,
02:04 AM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
W65C21N or W65C21S ?
see more
173 replies | 10932 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...
see more
173 replies | 10932 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. ...
see more
173 replies | 10932 view(s)
February 4th, 2021,
03:49 PM
Nivag Swerdna
replied to a thread
PETunia's Repair Log
in
Commodore
OK so you turn your back and it all stops working... I have been running with a ROM/RAM substitution board for a while and have ignored the ROM...
see more
173 replies | 10932 view(s)
February 3rd, 2021,
04:00 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
The difference between $0000 and $0001 is addressing. But I can wait.
see more
177 replies | 6796 view(s)
February 3rd, 2021,
03:10 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
We need to see FA0..FA6 at the DRAM (and their friends nRAS and nCAS)
see more
177 replies | 6796 view(s)
February 3rd, 2021,
01:57 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
True, I fixed my post above accordingly... the first 00 is hard to see in a sea of 00s so my example dump shows the 2nd write to $0001 Well it's...
see more
177 replies | 6796 view(s)
February 3rd, 2021,
01:27 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
The code in the LISTING of Post #116 is correct. It does have an interesting effect which is not completely obvious in that it stores 00, 01, 02,...
see more
177 replies | 6796 view(s)
February 2nd, 2021,
05:36 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
Looks great! Clever I ran it through the 6502 emulator in my brain and it looks good. 01, 02, 04, 08... into 00, then... into 01, ... into FF......
see more
177 replies | 6796 view(s)
February 2nd, 2021,
01:58 AM
Nivag Swerdna
replied to a thread
Memory problem with PET 2001
in
Commodore
#112 is a beautiful plot. Really shows the data side working well. I cannot see any issues there. Probably should be archived for people to...
see more
177 replies | 6796 view(s)
More Activity
No More Results
No Recent Activity
About Nivag Swerdna
Basic Information
About Nivag Swerdna
Location:
London, UK
Occupation:
Technical Consultant - Computing - Distributed and Embedded Systems
Statistics
Total Posts
Total Posts
160
Posts Per Day
0.70
General Information
Last Activity
Today
02:59 AM
Join Date
July 17th, 2020
Referrals
0
Find latest posts
View Articles
View Blog Entries