"ajp166" <ajp166_at_bellatlantic.net> wrote:
> From: Dwight Elvey <elvey_at_hal.com>
>
>
> > There was no standard port used for serial I/O. and even if
> >there was, the device could have been a AY-3-1015, a 8251 or
> >a 8250. All of these would have different handshake and
> >setup information. I don't know how you'd be able to have
> >anything that you'd call standard.
>
>
> Wrong. The standard devices were usually AY-3-1015/COM2502
> based and tended to use the MITS status bits and IO addresses.
> Mits never used the 8251, and the 8250 was later to the scene.
Hi
I agree, I was only including it to indicate that someone
might have used such a board, not indicating that this
was what originally came in an Altair. As you stated,
it was relatively easy to patch other device and many
upgraded their serial boards over time to newer
devices.
Dwight
Received on Tue Sep 12 2000 - 15:11:21 BST