> >> >>> Mar 20, 2021 7:29:45 PM Adam Nielsen via Freedos-user >>> <freedos-user@lists.sourceforge.net>: >>>> >>>> >>>> At any rate, the bit I'm stuck on is trying to find out how to get so >>>> many I/O pins from the ISA bus into the Pi. I am thinking it might >>>> have to be done with an FPGA as many of them have enough I/O pins to do >>>> it, then the question is how to get the relatively high bandwidth >>>> result across to the Pi, since GPIO probably won't cut it. I'm >>>> guessing you'd have to use either USB3 or the Pi's camera input, with >>>> USB3 probably being better documented and also more flexible since it >>>> could then allow you to connect the board to a normal PC and run all >>>> the software there if you didn't want to have a Pi sitting inside the >>>> DOS PC. >>>>
There's a project called the "Unibone" that does this for the PDP-11 Unibus with a BeagleBone Black. http://www.retrocmp.com/projects/unibone The BBB has two real time coprocessors that handle high speed GPIO, which are used for interaction with the bus, and then Linux on the main processor does the user interaction and less time-critical heavy lifting. It can even drive the real bus with an emulated CPU running on the BBB. ISABone, anyone? _______________________________________________ Freedos-user mailing list Freedos-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-user
