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DMA Bliss by Effect & Ephidrena & SMFX
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added on the 2025-07-10 14:04:18 by nerve  |
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For those not in the know. Earlier Atari STe dma chips had some different behaviour in certain cases than the later chips. For a long time these earlier chips were deemed 'bad' dma. Only recently due to decapping and analysis of the chip the community found out the subtle hardware difference between the two versions. As a result, by using the 'bad' dma chip version in an other way (in code) it turns out the chip behaves as intended. This release contains a binary patch for one of the better known hard disk drivers for the Atari, such that this hard disk driver now also works correctly with the 'bad' dma. And thus, we achieve DMA bliss!
added on the 2025-07-10 14:35:17 by spkr 
Much appreciated fix and great intro!
The only 96KB and even STEreo music !
Nice intro for some cool hackers!
Wow, this is great! THE hard drive fix, and awesome intro! :)
Bliss!
Yes! ;)
Cool concept to pair an intro with some useful fix!
powwwwwwwww
Thanks to CHZ-Soft for the Bad DMA investigation and to Nerve for doing the patch program :) Finally only badass DMA!
Oh, and nice intro too!
Oh, and nice intro too!
Appreciate the effort.
I've got an 'early' TOS 1.6 STE with that issue.
Unfortunately I discovered it in 1991 and got a friend to replace the chip.
I've got an 'early' TOS 1.6 STE with that issue.
Unfortunately I discovered it in 1991 and got a friend to replace the chip.
Really nice work! It was very exciting listening to Nerve telling me all about this at Black Valley.
Nice
ok
:)
many thanks Team, many thanks Christian 'czietz' Zietz
Cool intro, and congrats for the fix!
heh ...
i fixed one STe out of two machines only a month or so ago, and now while clearing my demo backlog i bump into this ...
I assume this doesnt work like the acsi2stm ( https://www.16-32bit.eu/acsi2stm ) where you can patch it to work with "bad" dma but you get a drive that transfers data at 10-20% of the standard speed, making it good to load games but not to run demos like bad apple or coders guide.
?
If its so i can possibly still fix up the other one although the stm has been patched already but the question to me :
does it fix the DMA sound issue ? ( :) gotta love Atari) the other machine has bad dma sound , meaning its all there, the tests detect it and all demos run fine but i need a 90s amp cranked to the max to get a faint sound
otherwise, this is a great moment in st history countering Atari's fumbling to the masses id say ... now only missing a mister fpga core for the falcon because i heard that was being decapped too (and falcons are out of reach of my wallet in 2025 and gods know i tried ...)
i fixed one STe out of two machines only a month or so ago, and now while clearing my demo backlog i bump into this ...
I assume this doesnt work like the acsi2stm ( https://www.16-32bit.eu/acsi2stm ) where you can patch it to work with "bad" dma but you get a drive that transfers data at 10-20% of the standard speed, making it good to load games but not to run demos like bad apple or coders guide.
?
If its so i can possibly still fix up the other one although the stm has been patched already but the question to me :
does it fix the DMA sound issue ? ( :) gotta love Atari) the other machine has bad dma sound , meaning its all there, the tests detect it and all demos run fine but i need a 90s amp cranked to the max to get a faint sound
otherwise, this is a great moment in st history countering Atari's fumbling to the masses id say ... now only missing a mister fpga core for the falcon because i heard that was being decapped too (and falcons are out of reach of my wallet in 2025 and gods know i tried ...)
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