Re:80286 ATX mainboard based on the IBM 5170 AT PC
by shiroiushi on Wednesday November 13, 2024 @03:01AM
(#42123832)
>Sounds like it's described as "based on" because it's heavily reverse engineered, modified to use more readily available components where possible, and then improved to 20MHz capability over the original 5170's 6/8MHz.
I wonder if he looked at any clone motherboards from that time, or a few years later? 16MHz and 20MHz 286s were quite common before the 386 took over, and they probably had to make some changes too (and came a few years after the PC AT, and so probably had a lot of improvements; the AT came out in 1984, but the clone 286s were still pretty strong in the late 80s).
Re:80286 ATX mainboard based on the IBM 5170 AT PC
by Suppafly on Wednesday November 13, 2024 @11:58AM
(#42127750)
I was thinking 286's were faster than was being mentioned, but I suppose his design was speeding up a design from the beginning of the era instead of copying a later design.
Re:80286 ATX mainboard based on the IBM 5170 AT PC
by shiroiushi on Wednesday November 13, 2024 @08:22PM
(#42132165)
286s were quite fast for DOS applications in their later days; they were actually faster than the newer 386SX systems that were competing against them, but of course they couldn't do 32-bit operations.
Re:80286 ATX mainboard based on the IBM 5170 AT PC
by userbinator on Wednesday November 13, 2024 @03:01AM
(#42123833)
There's also the somewhat odd "XT/286" 5162, which was somewhere in between the two, and closer to the AT than the XT.
https://dfarq.homeip.net/ibm-5162-pc-xt-286-the-at-in-xt-clo...
Lots of info on the 51xx series of machines is here: https://www.minuszerodegrees.net/index.htm