Help? Install Ricoh to Powermac 7500?



Hi all-

Hoping to find a very knowledgable user in this forum?

I have an upgraded Powermac 7500:

G3-400mhz, 384mb RAM. I have this older Ricoh mp6200s drive that I’d like to incorporate in place of the Apple CD-ROM.

Toast scans & recognizes it but my Mac says “no driver” or such.

I’m a PC person breaking into Macs for the 1st time. I’ve done all updates/upgrades myself but am lost on this one.

The Apple ROM has different pins/jumper settings than the Ricoh & I have tried many settings to no avail…