I-O Data PK-A486BL75
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This is an 80486 CPU upgrade kit for PC-98 80386 based systems though should work in other PC compatibles. The module contains a 75MHz IBM 486BL3 processor and a 33MHz rated Cyrix math co-processor.
- http://www.cpu-world.com/forum/viewtopic.php?t=33542 - DIP switch settings, other info