Re: Looking for ALF AM ][ disks images

[Ralph <rwhyre@gmail.com>]

On May 2, 5:32 pm, David Schmidt <schmi...@my-deja.com> wrote:
> On 5/2/2012 4:52 PM, Antony Mauget wrote:
>
> > Hi to All,
>
> > I'm looking for the software provided with the Apple Music ][ card from ALF
> > products Inc., a.k.a. Music Card MC1. There is also the reference 10-5-1 on
> > the card.
>
> Are the ALF-songs.*.shk files on asimov under images/sound any use?
> There seem to be a couple of executables on there (play.system,
> squirt.system).

On May 2, 5:32 pm, David Schmidt <schmi...@my-deja.com> wrote:
> On 5/2/2012 4:52 PM, Antony Mauget wrote:
>
> > Hi to All,
>
> > I'm looking for the software provided with the Apple Music ][ card from ALF
> > products Inc., a.k.a. Music Card MC1. There is also the reference 10-5-1 on
> > the card.
>
> Are the ALF-songs.*.shk files on asimov under images/sound any use?
> There seem to be a couple of executables on there (play.system,
> squirt.system).

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.)