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ChuckyGang / DiagROM

The Amiga Diagnostic tool
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Diag 1.1 Always freezes on prelim A1200 mem chk on A4ks. #4

Open bozimmerman opened 5 years ago

bozimmerman commented 5 years ago

During the DiagROM startup, before the menu is displayed, the rom checks for both A4000 and A1200 fast memory. There is an option here to abort the tests if you are really good at playing the mouse-button timing game, which makes me think that a freeze is sometimes expected?

However, if such a freeze occurs predictably and regularly, it seems to me that it might just be an issue. I am seeing 100% reproduction of a freeze/lock-up during the A1200 mem check portion in Amiga 4000s.

So far, I have NOT seen this problem on my A4000/030 or A4000EC/030 (both of which using the A3630 cpu card). However, I have seen the problem 100% of the time on A4000s with A3640 cpu cards, on both A4000s and A4000T boards. Playing the mouse button game allows me to get past this, and all other tests come out fine. The machines are a random mix of NTSC and PAL, so I don't think that matters.

tkurbad commented 4 years ago

Hi @bozimmerman,

I'm just about to finish populating and testing a NOS A4000T Mainboard. The symptoms you describe could be seen on my board in combination with a A3640, too. However, recapping and upgrading the 3640 to 3.2 seems to have solved the problem. So basically, there seems to be nothing wrong with the DiagROM but with our ancient machines... ;-)

Best, Torsten

bozimmerman commented 4 years ago

I think I will patiently wait for those who actually know 68k assembly, the amiga architecture, and this codebase.