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Tube🍂Time

my DIFDIAG program can see the drive and talk to it, but some functions don't seem to be working. this will take some troubleshooting.
2 Dec 2023 at 22:44 | Open on mastodon.social
11 comments
Tube🍂Time replied to Tube🍂Time

so there is still data corruption occurring on the Thinkpad. only this time, write operations are affected. it's more or less random but much more frequent than the read issue i fixed earlier.

an old data word is getting counted twice. logic analyzer time. 😑
16 Dec 2023 at 23:44 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

this has turned into a very challenging project!

16 Dec 2023 at 23:45 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

after connecting the logic analyzer and bringing some internal signals out to pins, it suddenly decides to start working 😅
17 Dec 2023 at 18:29 | Open on mastodon.social
Jernej Simončič � replied to Tube🍂Time
Tube🍂Time replied to Tube🍂Time

the data ready handshaking flag is getting cleared in the wrong spot. test1 is the flag, and the green M1 cursor shows that it is getting cleared even though DMA hasn't started
17 Dec 2023 at 19:05 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

i was using a version of the "dma running" signal that was latched on the falling edge of CMD, so it was possible to trigger this clear signal even when DMA wasn't actually in progress.
17 Dec 2023 at 19:08 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

after that change, it seems to be passing both the write and the read test loops. i'll run them a bit longer just to make sure.

17 Dec 2023 at 19:09 | Open on mastodon.social
Tube🍂Time replied to Tube🍂Time

i will say that it's the perfect time of year to be running this huge logic analyzer. it puts out a lot of heat!

17 Dec 2023 at 19:11 | Open on mastodon.social
Piersg replied to Tube🍂Time

@tubetime is it Geiger counter on the RAM time? (Apologies if that was the first thing you tried)

17 Dec 2023 at 6:34 | Open on postchat.io
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