Upgrading The CPU - 1986 IBM 5162 PC XT 286 Restoration - Part 2
429Series Playlist: https://www.youtube.com/playlist?list=PLLJ-Nv_tKpJlJfdkefnnU-I8gemd9TPjO
IBM's 5162 XT-286 machine was a bit of an oddball. Released in 1986, it was comparatively low specced for its time but of course still subject to the "IBM Tax" - making it notoriously bad value for money. What's worse is that IBM built in various measures to prevent users being able to upgrade it, so as to prevent cannibalisation of PS/2 sales.
So what were these limitations? How do we work around them? Just how fast can this thing go anyway? Find out in part 2 of my ongoing upgrade and restoration series!
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Relevant Links:
IBM 5162 RAM Information: http://minuszerodegrees.net/5162/ram/5162_ram.htm
Tantalum Capacitors: http://minuszerodegrees.net/failure/failure%20-%203lt.htm
Overclocking the IBM 5162 / BIOS Information: https://www.retrocmp.de/ibm/5162/xt286.htm
Further Viewing:
Part 1: https://youtu.be/zWkYrhrdogQ
PC-SPRINT Overclock Tool For IBM 5150 XT: https://www.youtube.com/watch?v=8oWyogPZ7Bw
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Chapters:
00:00 Intro
00:25 Teardown - What's Inside The IBM 5162 XT-286?
01:15 Motherboard Overview & Tour
02:14 BIOS Clock Speed Limitation - How & Why
02:59 Motherboard Overview Continued & CPU Clock Circuitry
04:04 Socketing & Replacing The Slow 82284 & 82288
04:34 Replacing The 3-Legged Tantalum Capacitors
05:28 Benchmark - Stock 5162 XT 286 & ATX PSU Upgrade Musings
06:01Adding An 80287 Math Co-Processor
06:38 Upgrading The IBM 5162 XT 286 To 12MHz CPU
07:23 8MHz Clock Speed & AMI BIOS Swap
08:43 10MHz Clock Speed & Some Potential Issues?
09:44 Upgrading The 150ns RAM To Something Much Faster
10:26 Musings On Slow RAM & Further Upgrades
10:43 Pushing The 5162 XT-286 To 12MHz?
11:13 Further Upgrades Coming In Part 3 - The Need For Speed!
#vintagecomputing #retrogaming #restoration