[Coco] A little OT, but...

[Mark Ormond]

You can get the bare at to xt converter pcb from lynchaj here.

http://www.vintage-computer.com/vcforum/showthread.php?15907-AT-to-XT-Keyboard-Converter/page31





-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On Behalf Of Bob Devries
Sent: Thursday, September 01, 2011 6:05 AM
To: CoCoList for Color Computer Enthusiasts
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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