From Newsgroup: comp.sys.ibm.ps2.hardware

https://www.ebay.com/itm/126872043591

Useful in a 25 MHz 8570.

This can be useful if you have a 25 MHz -Axx/Bxx without a CPU card. You
need the 386 specific BIOS.


Model 70 386 25 MHz (-Axx, Type 3) https://www.ardent-tool.com/8570/Planar_T3-4.html#ROM_Images

33F9988 / 33F9987 - 20 Feb 1989, rev. 1, 2x AM27C512-175 (U58 / U57)
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