I tried doing this with my T102 a few years back and couldn't get the baud rate anywhere close to 31250. 🙁
On Sat, Mar 7, 2020, 20:34 Tom Wilson <wilso...@gmail.com> wrote: > Serial to MIDI adapters are around - although you'd probably have better > luck finding a design and building one yourself than finding a pre-made > one. (The serial port being the wrong gender doesn't help things.) > > The protocol itself is largely the same, but you need level conversion, > and the baud rate is 31250bps. Not all UARTs can be programmed for that > speed, so that's something TBD. > > Here's a circuit. It looks like it uses a MAX232 for level shifting and a > 6N138 on the input side to make the current loop usable by the MAX. > > If you're just looking to transmit, you can skip the 6N138 and just use > the MAX232 and associated support bits (caps and resistors.) > > Some other devices, such as certain models of Sound Canvas and a few > varieties of Yamaha XG sound models actually have a serial port interface > built right into the machine. So you could send MIDI data to one of those > without needing the level conversion. > > The only issue is that I'm not sure if or how the serial port can be set > to the correct baud rate. MIDI runs at 31250 bps. I'm not sure how the > T100's UART is programmed at the machine level, so that could be a concern. > > One way around this might be to use an Arduino as a buffer - connect the > Arduino and the computer with a simple MAX232 converter, then use the > Arduino to send the actual MIDI messages through a MIDI shield. (Or just > get the musical instrument shield with the on-board synth.) > > > > > > > > > Tom Wilson > wilso...@gmail.com > (619)940-6311 > K6ABZ > > > On Sat, Mar 7, 2020 at 4:38 PM Hiraghm <hira...@hotmail.com> wrote: > >> I vaguely recall a few months back someone talking about some kind of >> MIDI with their M100. >> >> I've got a Roland MT-32 and a couple PMA-5s, and I got to wondering how >> I could interface them to my M100, then maybe write some MIDI >> player/editor software. >> >> Just saw a video tutorial on YouTube where Bisqwit wrote a MIDI player >> program for DOS in GW-BASIC. >> >> A serial port interface, assuming one could be built, would be fast >> enough; iirc MIDI communicates at the same speed as HTerm. >> >> A parallel port interface might be more convenient, if possible... >> >> I've been reading recent threads about someone using the cassette >> interface as a secondary display interface. I suppose maybe that could >> be used, instead, too... >> >> Now I'm wondering if a MIDI keyboard could be interfaced via the bar >> code reader port? >> >> If so... PMA-5 connected via serial, parallel or cassette port, MIDI >> keyboard connected via barcode port, custom software... portable MIDI >> DAW... >> >> So is this idea crazy? Impossible? Waste of time? >> >>
