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Mega ST video output oddity

Problems with your machine in general.
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exxos
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Posts: 28217
Joined: 16 Aug 2017 23:19
Location: UK

Re: Mega ST video output oddity

Post by exxos »

You not simply got some bad ROMs or bad RAM have you ? What ROM's exactly do you have ? Some brands like Texas cause odd issues, nobody knows why.
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Atarian Computing
Posts: 581
Joined: 22 Aug 2017 04:27

Re: Mega ST video output oddity

Post by Atarian Computing »

I know the roms are fine as they are my test roms. But could be that they might not work properly on this particular unit. I believe I've tried different ones but since I have so many projects I'll double check. I'll test the RAM too. Thanks.
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czietz
Posts: 583
Joined: 14 Jan 2018 13:02

Re: Mega ST video output oddity

Post by czietz »

RAM can be tested with the diagnostic cartridge. ROM checksums can also be tested with the diagnostic cartridge.

I assume your test ROMs are of the two chip variety. Is the Mega ST mainboard in question properly set to two chip ROMs, then?
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Atarian Computing
Posts: 581
Joined: 22 Aug 2017 04:27

Re: Mega ST video output oddity

Post by Atarian Computing »

czietz wrote: 26 May 2018 10:47 RAM can be tested with the diagnostic cartridge. ROM checksums can also be tested with the diagnostic cartridge.

I assume your test ROMs are of the two chip variety. Is the Mega ST mainboard in question properly set to two chip ROMs, then?
Whale oil beef hooked! That was it. Ran checksum test and it gave errors. That was a 32 pin rom on an adapter that works on every other ST here. Put in a mask rom set and it works. Weird. Will need to investigate further. Thanks!
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