Where exactly does the ISA bus begin in a computer?

Try to ensure that the wiring at the connector that gets into the ISA slot is checked every part of the device(every IC,all those jumper wires

I compared ISA nad PCMCIA pinouts and there a lot of ISA slot and connect wires to PCMCIA pins) would work? Or would some

isa expansion slot In this image, you can see, from the right, a 16-bit ISA slot , an 8-bit ISA slot, four more 16-bit ISA slots,

isa slot adapter ISA Connector Pinouts ; B6 DRQ2 ; B7 -12V ; B8 SRDY_L ; B9 +12V