Development, round II

From: Andrew Gammuto <agammuto_at_konics.com>
Date: Thu Jan 29 21:25:22 1998

If I remember correctly, IBM released the XT 286 when the second generation
PC/AT (with a faster clock - wasn't it 8 MHz?) came out. It was my
impression then that the XT286 was an XT case with the older original AT
motherboard inside.

-----Original Message-----
From: Mike Allison <mallison_at_konnections.com>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Date: Thursday, January 29, 1998 10:04 PM
Subject: Re: Development, round II


>Tony:
>
>I just seem to remember _something_ about the XT286 that made me avoid
>it for true 286 stuff. Maybe it was the memory. Most after market AT
>boards had room for a meg or two. Maybe it was the 640...
>
>-Mike
>
>Tony Duell wrote:
>
>> I've not got the XT-286 techref to hand, so I can't look at the
>> schematics. But I seem to remember that it's _very_ similar to the PC/AT
>> - it's a lot closer to that machine than to the XT. There are 2 DMA
>> controllers, 2 interrupt controllers, the 8042 keyboard controller (so it
>> takes an AT keyboard), etc. My thoughts when I looked at the schematics
>> were that it was a repackaged AT. Of course they could have missed out
>> the extra reset logic, but I doubt it.
>>
>> It does use a non-standard motherboard, though. The memory is a little
>> odd - 128K in DIPs (4 off 64K*4, 2 off 64K*1 for the parrity) and 2 256K
>> SIMMs for a total of 640K.
>>
>> >
>> > I guess....
>> >
>> > -Mike
>>
>> -tony
>
Received on Thu Jan 29 1998 - 21:25:22 GMT