Editing IBM PS/2 Model 25 (section)

== References ==

* [https://en.wikipedia.org/wiki/IBM_PS/2_Model_25 IBM PS/2 Model 25 &mdash; Wikipedia]. Source for release/withdrawal dates, model line history, submodel list, MCGA/VGA video distinction.
* [https://www.dosdays.co.uk/computers/IBM%20PS2%20Model%2025/ibm_ps2_model_25.php IBM PS/2 Model 25 &mdash; DOS Days]. Source for submodel pricing, planar IC layout, PSU wattage, hard drive options, BIOS layout (two 32 KB EPROMs in U19/U20), and proprietary memory pinouts.
* [https://www.ardent-tool.com/qtechinfo/8525.html IBM Canada Ltd Quick Reference &mdash; PS/2 Model 25 (8525)]. IBM-supplied technical reference: machine type, announce date, list price ($2,095 / $2,595), microprocessor and clock, BUS, ports, memory, PSU wattage and weight (12.7 kg mono / 16.8 kg colour), dimensions (382 × 320 × 375 mm), MCGA modes, configurations and options.
* [https://www.ardent-tool.com/qtechinfo/8525-286.html IBM Canada Ltd Quick Reference &mdash; PS/2 Model 25 286]. Source for the Model 25 286 chipset (VLSI VL82C100&ndash;104), wait-state count, ISA 16-bit slot count, hard drive option, BIOS/RTC battery.
* IBM, ''IBM Personal System/2 and IBM Personal Computer Product Reference, Version 4.0'' (September 1988). Source for the submodel table.
* [https://www.ardent-tool.com/trouble/ps2error.html PS/2 Error Codes], Ardent Tool of Capitalism. Reference for the PS/2 error code organisation (Major Error / Minor Diagnostic Error, the 4 + 4 format used on the Premium Line LED panel).

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