YES! That's the one I was thinking about too. I remember making some simple games in this as a kid and I learned a lot of assembly using this at the time also because, if I recall, you actually referenced registers and such right in with your other code - or something strange like that.
Thank you, thank you, thank you!
Wow - I used this one too (vividly remember the "fire" effect demo) and have looked for it a few times to no avail. Nice find :-)