Z-100 serial ports

From: Glen Goodwin <acme_ent_at_bellsouth.net>
Date: Fri Jan 25 23:21:44 2002

Please see below.

> From: Don Maslin <donm_at_cts.com>
> Date: Thursday, January 24, 2002 2:55 PM
> On Thu, 24 Jan 2002, Glen Goodwin wrote:
> > Although I have (I believe) all of the manuals for the Zenith Z-100
> > Z-100 pc), I cannot find any reference to the serial ports on this box.
> >
> > What are the addresses of the DTE and DCE ports? I'd like to write
> > assembly code to access these devices (under CP/M-86) but want to
> > them at the hardware level instead of making BDOS calls.

> The overlay for MEX (CP/M-80) says that the modem port - presumably
> DTE - is 0D8H. It does not mention the DCE port. Do both processors
> share the same seriak and parallel ports?
> - don

2nd question first -- yes, the same ports are used regardless of the MPU.

1st question -- found some info in the 2nd manual under "programming data"
(I was looking for *hardware" data!):

2661 Serial A (Printer Port) 0E8-0EB
2661 Serial B (Modem Port) 0EC-0EF

Now I need to know exactly what the control and data addresses for these
ports are. Maybe the first number is data and the second control, or the
other way around? I'm not familiar with the 2661 -- any pointers?

Hey -- I'll bet Tony knows!

Thanks again,

Received on Fri Jan 25 2002 - 23:21:44 GMT

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