ranix wrote:you know what would really float my boat is DIN Sync
ranix wrote:The difference between MIDI clock and DIN sync is that there's no other traffic on the DIN Sync cable that could shunt the timecode messages. Pin 4 for reset is important but pin 5 for Fill-in would be useless outside a drum machine and I don't think I'd try to support it. DIN Sync would be best on its own connector.
Miguel wrote:Unlike the old Roland MIDI cables that I have most MIDI cables sold these days tend to have all 5 pins wired up which is not recommended for use with the Atari's non standard MIDI out/thru connector so anyone rocking an Atari should be using a MIDI cable with just the 3 pins wired unless of course they have a splitter to separate the Atari's MIDI out and thru ports.
Miguel wrote:Ideally Sync24 should have it's own socket rather than use up a MIDI socket
Miguel wrote:Perhaps you should contemplate using panel mounted sockets rather than ones soldered to the PCB if space is an issue Foxie...after all PCB mounted sockets are rubbish anyway.
Miguel wrote:I read somewhere that there is a Sync24 cable for use with Maxymiser which plugs into the printer port, but then that's a waste of a perfectly good printer port which could otherwise be used for printing off dot matrix pictures of Samantha Fox.
ranix wrote:Pin 4 for reset is important but pin 5 for Fill-in would be useless outside a drum machine and I don't think I'd try to support it
ranix wrote:I was getting pins 1 and 4 confused in my last post, I'm also not clear on the function of pin 4. Start/stop as described above is pin 1. The cool stuff I like is just start/stop and clock (pins 1 and 3)
ranix wrote:oh the normal behavior is that a pause would just stop clocking pin 3 where it is (either high or low, whatever, you can transition it low if you want) and when you resume it just starts clocking again. So rather than a "stop and continue", it just ceases to get clocks and pauses right where it is indefinitely not advancing its internal clock. When the clock resumes it happily continues like nothing ever happened (because really nothing did from its point of view).
Foxie wrote:Although I'm not against including a separate DIN sync socket, it appears there is a way to safely combine DIN sync and MIDI on one socket. The MIDI output would drive pin 4 high instead of pin 5 low. Providing you don't send any MIDI data at all to the MIDI out, it will function like a normal DIN sync output. I would only do this for a couple of the MIDI outs. That way, you can still use non-compliant MIDI devices which need power on pin 4 on the remaining MIDI outs.
Foxie wrote:Korg gear is a little trickier to support with its 48ppqn. I could have a special Korg version of the driver that sends MIDI clocks in pairs to simulate 48ppqn. The clocks will be bunched together, degrading the perceived resolution to 24ppqn. But because of the need to meet Roland-compatible timings (4ms high/low time for pin 3), it will limit the maximum BPM to about 150 on Korg gear. I could add a special mode triggered by the driver which reduces the timings to 2ms. I'm not sure if it's necessary. Weren't there only about 3 Korg models that ever supported DIN sync?
ranix wrote:I think the DIN Sync bit wouldn't worry about pins 4 or 5 and would leave those unused.
I'd tie pin 5 to ground in hardware if I were you.
I'd only support DIN Sync on one of the MIDI ports.
There's a conflict on pin 2 - you might need to provide a hardware jumper to switch pin 2 from being +5V to ground.
ranix wrote:MIDI power is hairy, I might actually consider not supporting MIDI power if I were you and leaving pins 2 and 4 floating in MIDI mode. I would slightly prefer to have it but it's added complexity for very little gain. The only device I have ever seen that uses MIDI power is the Yamaha MD-BT01. Which I do happen to have, but I'm probably the only one around here who does
ranix wrote:There is also something that happens on my MIDI devices when I use cubase where when I press STOP twice in cubase the sequence resets to position 1. Cubase goes back to the first beat, and so do all my MIDI sequencers. When that happens, pin 1 should also go low/high/low
Miguel wrote:The Kenton Pro Solo II has a MIDI out port which can be switched over to Sync24 or to provide additional outputs although I think these are just 2 trigger outputs rather than gate and CV, oh yeah and speaking of CV have you seen the plans for an Atari CV interface in RA Penfold's book Musical Applications of the Atari ST?
ranix wrote:ah ok, you're right. I was looking at the incorrectly labeled colored midi pinout on a google image search. Pin 2 is indeed ground for both systems. Sure, I will test the MD-BT01
ranix wrote:I don't think it will send a song position pointer over MIDI - at least I have never used that functionality. Doesn't LTC need to track song position though? I also have never used my LTC in my Unitor
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