Pierre32 wrote on 2021-03-13, 04:04:
yyzkevin wrote on 2021-03-13, 03:35:
I found a schematic from 1987 of a roland ISA card for interfacing the MPU-401 and it showed the interrupt connection how I thought it should be so I implemented that change and I was also able to assign my card 330h and IRQ9 on a normal laptop with regular card services and I am able to open the sierra games LSL2, LSL3 etc but I am not sure if they are okay or not because the midi music is pretty gibberish, but I assume that is because it is a ridiculous VSLI 1052 chip taking what is meant for an MT-32
I am trying to get my hands on an MT-32 to do some testing before finalizing the pcb.
If you were in Australia we could organise a loan. But I suspect you are not!
Of course not that would be too easy! I am in Canada. There is a local guy that has a couple of them, but he ended his ebay listing and is now asking what I think is a bit high.
I was wondering, if there is a way for me to run Munt on a windows machine and have it accept the midi messages over a serial port, I am reading about that as a way to maybe do a preliminary test soon as it will take some time to get the MT-32.
I have the appropriate serial cables (ftdi chips....) that I can feed in the ttl level signal from my card, and they should be able to handle 31250 (would need to verify), so it is a matter of finding some kind of driver for windows that presents the serial port as a midi interface I assume?
edit: "Hairless Midi" appears to be what I am looking for, going to try this out shortly.
so it looks like I have an issue somewhere, but I am not sure what. Nothing sounds right, and many things just sound so far off they make no sense. I see the messages come up on the MT-32 emulator, at boot it said HardMPU, when I open various sierra games some messages pop up, but nothing musical can be heard all just random, more than just wrong instruments...
need to relook at every piece now.