The machine IBM really didn't want you to upgrade! #CPU #BIOS #multitasking #286

I take this rare IBM computer with an identity crisis and upgrade its CPU, its RAM and give it a little bit of DOS-based multi-tasking. This video is sponsored by PCBWay, for high quality PCBs and CNC machining, visit https://www.PCBWay.com! IBM sold both the XT and the AT side-by-side, however, in September of 1986, IBM pulled a strange stunt and released the Personal Computer XT Model 286, or model 5162. This machine is odd in many ways: it had the same case as the XT, with its angled design, but inside, was an AT, using the same 80286 CPU as the original 6 Megahertz AT/5170 model. The 5162 was only in production for 10 months, making it a pretty rare machine, but also the cheapest IBM machine that was capable of running a true multitasking operating system like OS/2.

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CREDITS: Thanks so much to Jacob for helping me out. He's not a sponsor of this video but I thought I'd mention his company, Monotech PC's. If you are looking for kit to rev up your retro life, then check his cool products at https://monotech.fwscart.com. He makes the NuXT PC, a Turbo XT in an ATX form factor, the EternalCRT which is a Monochrome/CGA and EGA to VGA converter and the XT-IDE Deluxe converter, which is a bootable Compact Flash and IDE interface expansion card for your PC or XT, as well as many other great stuff for your retro computing needs!

Links to supporting materials: Ctrl-Alt-Rees video part 1: https://youtu.be/zWkYrhrdogQ Ctrl-Alt-Rees video part 2:ttps://youtu.be/9NKAlRaUxyg Ctrl-Alt-Rees Video pt 3: https://youtu.be/ViE3euxFXAo Retrocmp.de 5162 page: https://www.retrocmp.de/ibm/5162/xt286.htm Vintage Computer Federation post re using IBM XT/286 with Award BIOS, using the AMI BIOS Suitable for the 5170: https://forum.vcfed.org/index.php?threads/ibm-xt-286-with-award-bios.79296/ 5170 BIOS page: http://www.minuszerodegrees.net/bios/bios.htm 5170 BIOS used in my video: https://www.minuszerodegrees.net/bios/BIOS_5170_30APR89_AMI_D286-1277-043089-K0.zip IBM 5162 Clock Generation schematic from minuszerodegrees: https://www.minuszerodegrees.net/5162/motherboard/5162_clock_generation.jpg IBM 5162 Relationship between CPU/NPU clocks schematic: https://www.minuszerodegrees.net/5162/motherboard/5162_cpu_npu_relationship.jpg IBM 5162 for Beginners from minuszerodegrees: https://minuszerodegrees.net/5162/misc/5162_basics.htm

I also tried out this ATI VGA-Wonder 16 card for a while: ATI VGA-Wonder 16: https://forum.vcfed.org/index.php?threads%2Fati-vga-wonder-16-and-the-ibm-pc-5150.28987%2F#post-360161

00:00 - Introduction 03:03 - Sponsored Ad 04:06 - The XT that was better than the AT 06:16 - How to upgrade the 5162 07:41 - RAM Upgrade 10:19 - RAM configuration 11:38 - The DOS memory map 13:41 - Configuring the expansion RAM 15:04 - My config.sys 15:45 - Upgrading the BIOS 17:22 - CPU Upgrade 25:36 - Multitasking ... https://www.youtube.com/watch?v=EfRrvmRkHHM