[Coco] A little OT, but...

[John Donaldson]

When I had my MM/1A, I used a keyboard that had a switch on the bottom to select 
either AT or XT format.

John Donaldson




________________________________
From: Bob Devries <devries.bob at gmail.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Thu, September 1, 2011 5:04:33 AM
Subject: Re: [Coco] A little OT, but...

Hello, Bruce,

Actually, there is a major difference in PROTOCOL between the XT and AT 
keyboards. The XT keyboard is a send-only device, and uses 1 start, 8 data 1 
stop bits. The AT is a two-way communication device and uses 1 start, 8 data, 1 
parity, 1 stop bits. Also, the codes produced are quite different.

Suffice it to say that if I plug an AT keyboard into my MM/1, it ignores it 
completely. I believe that the AT keyboard also needs to be sent some sort of 
initialisation code.

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- From: "Bruce W. Calkins" 
<brucewcalkins at charter.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Thursday, September 01, 2011 7:41 PM
Subject: Re: [Coco] A little OT, but...


> ----- Original Message ----- From: "Bob Devries"
> 
>> Hi all,
>> 
>> How easy is it to get IBM-XT keyboards these days?
>> 
>> If anyone in Australia has any to sell cheap or give away, please email me.
>> 
>> Regards, Bob Devries
>> Dalby, QLD, Australia
> 
> =========================
> 
> I have an AT female to XT male adapter inline for the only XT equipted computer 
>in my collection.  AFAIK the only electrical difference is the plug.
> 
> Bruce W.
> 
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco 


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