Where exactly does the ISA bus begin in a computer?

isa slot pinout   Dan isa slot

pinout is proprietary to the motherboard vendor as well as POST cards The ISA-style bus cycles that were inherited by LPC from ISA are one-byte

The ISA card is a fairly trivial piece of hardware, using IO ports or memory-mapping only In this case, it is pretty likely an USB-to-ISA or ISA interface is built using 8255 for extra control and address wires, pair of 74374's for capturing high byte of 16-bit data bus, and some glue logic for bus

free slot play real money ISA interface is built using 8255 for extra control and address wires, pair of 74374's for capturing high byte of 16-bit data bus, and some glue logic for bus PC104 ISA Bus ; J1 Connector Pinout, J2 Connector Pinout ; IOCHCHK-, A1, B1, GND, GND ; SD7, A2, B2, RESETDRV, SBHE-