Re: Need Passport Soundchaser interface card schematics (or close-up photos)

[Ralph <ralphw@gmail.com>]

Antoine, Thanks!  I'm doing the same with each Soundchaser interface
card I see.

AlphaSyntauri:

The AlphaSyntauri and Passport Soundchaser have different styles of
interface cards.

The chips I see on the AlphaSyntauri card from ebay are:
   2 x 74ls368 (hex bus driver)
   1 x 74ls00 (quad NAND gate)

Soundchaser:
The chips on the Passport Soundchaser card are still undetermined:

Since the documentation calls for the Soundchaser card to go in slot
7,
I assume there is a need for the timing signal that was only provided
to that slot.
Slot 7 would also be the easiest slot to route the ribbon cable
through

I'm speculating, but I believe one chip would be a counter or divider,
like a 74160.
and one other chip could be responding to the IOSelect signal on the
Apple 2 bus.
(perhaps a 7405).

On Aug 15, 9:22 pm, Toinet <antoine.vig...@laposte.net> wrote:
> BTW, I've just sent an email to the purchaser of the alphaSyntauri's
> recent auction and ask for close-up photos of the two sides of the
> interface card,
>
> antoine