First post, by pand
I have GUS PnP clone card with AMD AM78C201AKC chip. The original (red) GUSes PnP were built with AM78C201KC and I owned one of them years ago. If I remember correctly it had some compatibility issues in GF1 emulation mode, but after decades I don't remember exactly what was wrong. Nevertheless, I would like to ask somebody having GUS PnP running in MSDOS to verify one thing and post the results here. Can somebody please run the demo 'the fulcrum' (by matrix)
and check if the sound plays correctly at ~3:45 and on, or gets corrupted.
Please listen to the attached mp3s. The fulcrum_gpnp_dos_issue.mp3 was recorded from msdos/gus pnp clone and shows the issue at around 3:45 where the sound becomes messed up and noisy.
For a reference the correctly sounding track (recorded from windows version of fulcrum on linux/wine and x-fi sound card) - the file fulcrum_xfi_wine_correct.mp3.
The sound plays correctly with GUS classic/max (GF1) in MSDOS. Also I tried many configurations (irq, dma, card ram configuration etc.) and the issue occurs always (with GUS PnP clone). The same issue with messed/noisy sound occurs with other MSDOS demos/intros on GUS PnP clone if they are played one by one. The first time it always plays correctly, but sometimes the following productions sound noisy. In such cases PC restart or even iwinit.exe rerun fixes the issue. At this stage I'm trying to verify if the issue is unique to my card or common to other AM78C201 based cards.