isastm

ISASTM

Overview

ISASTM is an ISA host using a STM32H743 CPU, 32 MiB SDRAM and USB 2.0 Full-Speed / High-Speed.
It can enable ISA cards to be used inside a VM or even emulate an x86 PC internally with an external ISA bus.

The card is designed to be used with an ISA backplane, which supplies power and connects the ISA slots.
The design is optimized for automated assembly at JLCPCB.

Errata Rev. A

• Signal integrity issues, level shifters seem to drive the bus too hard. Maybe 33R series resistance.
• Reset line is missing a pull up on the ISA bus/HV side
• USB 2.0 High speed (480 MBit/s) untested, might not work.

Additional info

Firmware
Schematic

Twitter: Project thread

Credits

Thanks to @Toble_Miner for layouting the PCB!