Provide your IBM PS/1 2011 or 2121 with a low profile ISA riser card that attaches to the propietary expansion port (ACU port)
Designed by TrilobytESRetro in Spain
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IBM PS/1, though beloved by fans, was not famous for providing ISA upgrade ports out of the box (specially the 2011). This was solved at the time by incorporating an ACU expansion unit that attached …
Read More…IBM PS/1, though beloved by fans, was not famous for providing ISA upgrade ports out of the box (specially the 2011). This was solved at the time by incorporating an ACU expansion unit that attached to a proprietary port and made the PC much bulkier.
This ISA card comes from reverse engineering IBM's proprietary expansion port in the PS/1 and exposes 1 ISA 8 bit port and 1 ISA 16 bit port while keeping a low profile (you can close the case while this is plugged in!). Now you can install a Sound Card or other Expansion Card in your PS/1!!
The riser also has a -5V voltage regulator for expansion cards that need it, like the Sound Blaster 2.0 (up to 100mA supported by installed LM7805 TO-92, if you need more current on the -5V line please replace with an LM7805 TO-220 package)
Important: Full size ISA cards installed in this riser may interfere with the floppy drive, please check the pictures for reference.
WARNING: Not tested with high current draw boards (eg. IDE/Floppy controllers) and XT-IDE seems to have issues with it. Recommended for use with sound cards, networks cards, etc (no problem here). For more info see the author's comments here: https://forum.vcfed.org/index.php?threads/ps-1-2011-acu-project.80370/
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