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Re: TF330 possible issue?
Posted: 08 Mar 2019 10:38
by terriblefire
Maybe someone can measure the resistance between those pins on a working CD32.
Re: TF330 possible issue?
Posted: 08 Mar 2019 11:58
by alenppc
I can do it tonight, can someone tell me which pins those are?
Re: TF330 possible issue?
Posted: 08 Mar 2019 12:03
by supaduper
17,18 on 020
Just measured them at 1k
Re: TF330 possible issue?
Posted: 08 Mar 2019 12:24
by terriblefire
Presumably the timer tests work for everyone else?
Re: TF330 possible issue?
Posted: 08 Mar 2019 12:39
by supaduper
15 CIA consecutive tests and no problem here bud
Re: TF330 possible issue?
Posted: 08 Mar 2019 12:48
by terriblefire
I’m not able to check right now but the CIAB on the A1200 is on a diffent section of the data bus to CIAA...
However feels odd that the TF328 boots and the TF330 does not.
Does it boot with IDE removed?
Re: TF330 possible issue?
Posted: 08 Mar 2019 14:45
by anton.gale
I do not have a TF328. The unit boots with no accelerator installed. I'm going to swap Akiko out, I can't see any external pins that are dedicated to the functions that are being tested.
Re: TF330 possible issue?
Posted: 08 Mar 2019 15:17
by terriblefire
I would borrow a TF328 first. Unless you’re happy swapping Akiko.
It’s possible some games would get away with no CIAB timer. Especially CD32 games
Re: TF330 possible issue?
Posted: 08 Mar 2019 15:23
by alenppc
This is a very puzzling bug. I asked nils if he'd send me his CD32 for me to try some local debugging since I will be doing some recaps for him anyway. I can't reproduce any of these issues on my hardware.
I find it hard to believe an Akiko would just be defective, I have not seen C= chips fail this way (except for the standalone 8520 CIAs).
Re: TF330 possible issue?
Posted: 08 Mar 2019 15:26
by terriblefire
alenppc wrote: 08 Mar 2019 15:23
This is a very puzzling bug. I asked nils if he'd send me his CD32 for me to try some local debugging since I will be doing some recaps for him anyway. I can't reproduce any of these issues on my hardware.
I find it hard to believe an Akiko would just be defective, I have not seen C= chips fail this way (except for the standalone 8520 CIAs).
Agreed. But something is causing that CIA timer to fail even without the TF330 installed. I can make the TF330 break CIAB and check the behaviour is the same.
I suspect a short somewhere.
EDIT: I don’t think anton and nils have the same issue.