i must say this is a awesome ISA Extender Project. Thumbs Up for jwt27 😀
But i have a Question about Powering the External ISA Backplane:
When you use your Ribbon Cable to provide Connection from your ISA Mainboard to the Backplane *without* adding any Power to the Back-Plane directly, the Backplane become Power from the Mainboard so we need no Aux Power to the Backplane.
When Adding external Power like a additional AT Power Supply AND plug the ISA Ribbon Cable Extender with your mainboard we have this Situation:
Power the Mainboard AND Power from the Aux Power Input from the Backplane isn't a good Idea and i think we will blow up something, isn't it ?
I didn't use passive ISA Backplanes. Have a passive AT ISA BUS Extender Board some Circuits to cut the Power from the Master Mainboard to the Slave ISA Bus Extender when external Power is giving from the Aux Power Input from the Backplane ?
I have a very nice Schneider Euro PC II XT 8 Bit ISA Bus Keyboard Computer and would like to add an external ISA Extender, but this will bang my head about the two Power-Sources, first from the ISA Bus and second with the Aux Power Supply from the passive ISA Bus Backplane to blow up the Computer or more with two Power Outputs, ...