ENTRY and PLAY are the old (DOS 3.2 or 3.3) programs that apparently
were used with the initial
ALF 3-voice cards - I'd expect these to be very different than the
ProDOS PLAY.SYSTEM.
There are two different ALF music synthesis cards, one is a three-
voice based on discrete logic plus
a 74LS624 VCO, an 8253 timer chip, four CD4723 chips, and 3 8227DP
chips
(I actually don't have a datasheet for the 8227DP- does anyone know
what function it performs?)
The nine-voice card uses the SN76489, a programmable sound generator
and a kind of a cousin to the AY-3-8910.
It would be an extreme coincidence if both synthesizers could use the
same software, since latches and registers
and a programmable time wouldn't present the same bus interface as the
SN76489
(I remember seeing an demo of the ALF card running on an Apple II at
"The Future Now", a computer store in Cincinnati.)