[Coco] A little OT, but...

[Mark Ormond]

Parts list, schematics, etc. are here.

http://www.vintage-computer.com/vcforum/showwiki.php?title=AT2XT+keyboard+converter



-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On Behalf Of Mark Ormond
Sent: Thursday, September 01, 2011 7:50 AM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] A little OT, but...

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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