Re: IWM Does Not Exist?

["Laine Houghton" <laine@@@intergate.com>]

Michael,
I wasn't aware of the name Allen Baum in connection with the Apple //. I did
a google search and stumbled across an interesting site.
http://tinyurl.com/sbx0


interesting story here.
 http://tinyurl.com/sbws


"Michael J. Mahon" <mjmahon@aol.com> wrote in message
20031025030428.27614.00000072@mb-m04.aol.com">news:20031025030428.27614.00000072@mb-m04.aol.com...

> Of course the slot architecture is designed to be versatile and clean.
> That's part of the genius of the Apple II.
>
> It provided:
>
> 1) a 16-byte "device select" address space for each slot (intended
>    primarily for card control),
> 2) a 256-byte "I/O select" address space for each slot except slot 0
>    (intended primarily for control firmware), and
> 3) a 2048-byte "I/O strobe" address space for all slots to share,
>    together with a protocol for sharing,
> 4) fully decoded slot-specific "device select", "I/O select", and
>    "I/O strobe" signals.
>
> This was a very insightful design that encouraged "plug and play"
> I/O cards incorporating device specific drivers, allowing bootable
> devices to be designed without changing the computer or its ROM
> (after the Autostart revision).
>
> Pretty clean and forward looking for its time, I'd say.  And we have
> Steve Wozniak and Allen Baum to thank for this beautiful piece of
> engineering.
>
> -michael
>
> Check out amazing quality sound for 8-bit Apples on my
> Home page:  http://members.aol.com/MJMahon/