DISAppointment: Adding an ISA Slot to a Modern Motherboard

• dISAppointment

  2 149 5.9 C

  Adding ISA slots to modern motherboards

https://github.com/rasteri/dISAppointment

older similar project http://rayer.g6.cz/hardware/lpc_sio.htm

LPC is not without perils tho, there is trouble with DMA support as mentioned here https://flaterco.com/kb/ISA_chipsets.html

More about LPC bus https://blogs.coreboot.org/blog/2013/06/14/a-biology-laborat...

• rpi-bitbang-ethernet

  2 39 10.0 C

  📶 Send Ethernet frames straight from a Raspberry Pi 4's GPIO pins.

https://github.com/osnr/rpi-bitbang-ethernet

Might be possible, someone bitbanged (sending) ethernet frames.

This example makes me convinved that if you added a clock and some latches to a raspberry pi, it definitely should be able to do ISA bus.

Maybe even without any hardware, who knows. But it needs to level shift from 3V to 5V anyway.

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• picogus

  12 455 8.9 C

  Emulation of ISA sound cards on Raspberry Pi Pico (GUS, Adlib, MPU-401, Tandy, CMS)

• pigus

  1 54 10.0 C++

  Gravis Ultrasound emulator on an ISA card, using bare metal on a Raspberry Pi 3/4/CM4

I had some very successful experiments with bit banging ISA on a Raspberry Pi 3 and 4 a while ago: https://github.com/polpo/pigus I quickly moved over to a Raspberry Pi Pico because it's much better suited to such things. You need more than a couple I/O pins, though... to do real ISA (i.e., not LPC) right, you need more GPIOs than what the Pi gives you. But muxing the data/address lines is enough to give you back what you need.

Suggest a related project