IO DATA PK-A486BL75 386 PGA to 486 75 mhz cpu upgrade accelerator

Description

Tested in a dos computer, works great. This is a 386 to 486 accelerator. It upgrades a 386 to a BL3 75 Mhz processor. I do have drivers in Japanese, but I don't know if they work on an English machine.
For more information: https://wiki.preterhuman.net/I-O_Data_PK-A486BL75