Looks like it! Another clue: when I start the unpacked cd2.exe from Watcom 11 wd.exe debugger, and then I swap the exe for the original one before actually running the code, it seems to work fine.

Not sure it's a PKLITE thing. When I run the repacked cd2.exe (UNP then non-Pro PKLITE 1.12), it seems to run perfectly fine again despite the few different bytes. When I pack it with PKLITE 2.01, it crashes with "FATAL ERROR: Out of memory".

Proof that CD2.EXE is using PKLITE:
1. Unpack cd2.exe with UNP 4.11
2. Repack it with PKLITE 1.12 (-e option)
3. fc /b cd2.exe cd2new.exe shows that apart from the copyright header, only 5 bytes are different - min/max memory header field, and first instruction ("mov ax, 4DFFh" vs "mov ax, 4E00h")

Unfortunately, the unpacked exe crashes when started. I never looked into that. Might have to do something with handling of the overlay part of the EXE. Or perhaps the Triton guys employed some kind of protection. If you ever find out, please let me know!

Look like it, although it's been long time since I messed with MZ EXE structure. Headers in PKLITE.EXE itself use the same approach. Another interesting is the overwritten PKLITE header in CD2.EXE at offset 1E, a common scene practice. When I put the original text back, the EXE still works :-)

I have not verified that, I just used the good old UNP tool by Ben Castricum to unpack it, which detected the packer as PKLITE v1.12 with "-e" option.

The original cd2.exe is packed by PKLITE and its unpacker starts executing at file offset 0x60, which becomes CS:0x100 when loaded. But somehow, I feel this is not the answer you are looking for...

And this might actually be faster than 5fps! :-)
www.pouet.net/prod.php?whi...

With GUS+SB16 and a PCI-based S3 Trio 3D/2X, it might be a great machine for late DOS demoscene stuff, like this:
www.pouet.net/prod.php?whi...
www.pouet.net/prod.php?whi...
www.pouet.net/prod.php?whi...

That's actually a bit of a problem for me - I have more of those cases than matching boards. This is the workaround I used for my 486 at 120 MHz :-)

It looks like I have the same case! But much more yellowed.

I have both, but I don't make videos... They each have pros and cons. Orpheus II is great for my Pentium 3 PC with DOS+Win98+Win2K, while PicoGUS seems better suited for early 1990s 386/486 PCs. The only feature I miss is SB16 compatibility. GUS PnP + SB AWE 32/64 combo would be my dream card! :-)

Correction: Heaven 7 is from 2000. It's one of the last DOS 64K intros. By 2001, the scene moved to Windows.

Heaven 7 by Exceed (PC, 64KB, 1999)

Amiga just arrived! :-)