PDA

View Full Version : What keyboards are compatible with the IBM XT



Chromedome45
August 29th, 2013, 04:23 PM
title pretty much says it all. I have an XT which has the latest BIOS which should support 101 key AT type keyboard. But the one I have (the only one) throws a 301 error at start up. I noticed it has the Windows keys which probably shouldn't make any difference. But I don't know for sure. Maybe I can try to find an older non windows AT and see if it works? Any help appreciated it. Hopefully it's not something
on the motherboard.

SpidersWeb
August 29th, 2013, 04:44 PM
It needs to support the XT protocol/signals. The latest BIOS doesn't let you use AT keyboards, just better 101 key support.
The keyboard controller chip itself changed when IBM released the AT, and as time went on "XT support" got dropped on keyboards.

Some models, like the IBM Model M, will auto-detect it's an XT and change modes, but most 101 key XT keyboards I've seen have a physical "AT / XT" switch on the bottom and are from the late 80's. I've bought entire boxes of keyboards before just to get one or two that had the switch (hopefully they're easier to find for you guys).

Al Hartman
August 29th, 2013, 04:53 PM
Some keyboards were auto-switching, but anything recent won't be. I have a box full of old keyboards that can be used on an XT, including my very first XT keyboard. I think it's always good to keep one.

Stone
August 29th, 2013, 05:12 PM
Frank, how is it that you don't have a Model M? You have everything else. And everybody else here seems to have at least one. Where were you when the Model Ms were passed out? :-)

Al Hartman
August 29th, 2013, 05:15 PM
Where were you when the Model Ms were passed out? :-)

Passed out? ;)

Chuck(G)
August 29th, 2013, 09:43 PM
One of the good old standbys for switching keyboards were the Honeywell/Keytronic 101WN models. Honeywell sold a raft of them, so there still might be a few around yet. I think I still have a couple.

modem7
August 29th, 2013, 10:04 PM
Of course, an AT2XT keyboard converter (AT2XTKB) enables an AT-class keyboard to be used on an XT.

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

Chromedome45
August 30th, 2013, 04:00 AM
Stone: I did have one but sold it! yeah stupid me.

Al: help a fellow TRS-80 lover out here think you could pass one this way? For a nominal fee?

Chuck: if Al can't help out would you part with one of them? also for a nominal fee?

Modem 7: I was looking at that and I would need to get all the parts togther. Unless there are some built ones laying around.

Compgeke
August 30th, 2013, 07:19 AM
The Model M 1390120 I can tell you for sure works on PCs and XTs as they're made for the XTs, hence their lack of LEDs. I haven't tested other Model Ms, however I have heard they will work.

Al Hartman
August 30th, 2013, 09:54 AM
Al: help a fellow TRS-80 lover out here think you could pass one this way? For a nominal fee?

I will look through my keyboards and see if there's one I can spare. I have a 5150 here I can test it on. I'll let you know.

Chromedome45
August 30th, 2013, 01:16 PM
Appreciate it. Thought you said you have a box full?

Chromedome45
August 30th, 2013, 03:54 PM
Well good news bad news. Bad news I won't be needing a keyboard after all. Good news I fixed mine. Bad cap and reheated many solder joints.
so it lives again. The Keyboard that is!

Al Hartman
August 30th, 2013, 04:28 PM
Appreciate it. Thought you said you have a box full?

I have a box full of keyboards, not every one is a switchable XT/AT keyboard, and some I will NEVER part with. I have some nice keyboards in that box...

Chromedome45
August 30th, 2013, 05:04 PM
Never part with a 83 key Model F I did and still regret it as well as a Model M