https://i.ebayimg.com/images/g/PlwAAOSwNSxVDIjA/s-l1600.jpg

Maybe it depends on an internal oscillator in the 53C90?

On 6/8/2022 10:25, Louis Ohland wrote:

http://ps-2.kev009.com/ohland/SCSI/Iomega.html

Went to the deep end of the digital swimming pool. Foundt WinNT
3.51/4.0, Win9x, Win3.1/DOS, OS/2 drivers.

Added images of PC4, PC4B/50.

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