larryleffaovell Posted June 7, 2023 Share Posted June 7, 2023 (edited) I have pimped my 1200XL with an U1MB, UAV, Stereo-Pokey and Covox. The audio signals are going to a simple 3x audio mixer pcb. Everything is working fine and makes me happy to see such a rare system coming up to a new live. As the 3rd input of the audio mixer is empty I thought it'd be a wonderful idea to equip it with a MIDI-XEL device (not the MIDI-XEL II), which is already working in my 1088XEL, so I wired the device to audio, SIO and /RST of the 6502. The MIDI device is playing it's welcome sound when powering up the 1200 but is staying silent when playing MIDI files. Anyone any idea what I'm missing here? Looks like that the MIDI-XEL isn't available at mytek anymore but can be still found here. Documentation and schematics in my own archive. Edited June 7, 2023 by larryleffaovell Quote Link to comment Share on other sites More sharing options...
larryleffaovell Posted June 7, 2023 Author Share Posted June 7, 2023 One thing I've found while re-RTFM is that these SIO signals are going through a 100 Ohm resistor network on the 1088XEL before going to the SIO socket. I've seen but ignored that by ignorance. Re-wiring now... Quote Link to comment Share on other sites More sharing options...
larryleffaovell Posted June 7, 2023 Author Share Posted June 7, 2023 Solved by using the upstream resistors. Motor Control is going straight to SIO. Great! Now re-seating all loose but housed pcb's, cleaning up and let's party! Quote Link to comment Share on other sites More sharing options...
+Stephen Posted June 7, 2023 Share Posted June 7, 2023 7 hours ago, larryleffaovell said: I have pimped my 1200XL with an U1MB, UAV, Stereo-Pokey and Covox. The audio signals are going to a simple 3x audio mixer pcb. Everything is working fine and makes me happy to see such a rare system coming up to a new live. As the 3rd input of the audio mixer is empty I thought it'd be a wonderful idea to equip it with a MIDI-XEL device (not the MIDI-XEL II), which is already working in my 1088XEL, so I wired the device to audio, SIO and /RST of the 6502. The MIDI device is playing it's welcome sound when powering up the 1200 but is staying silent when playing MIDI files. Anyone any idea what I'm missing here? Looks like that the MIDI-XEL isn't available at mytek anymore but can be still found here. Documentation and schematics in my own archive. Can I get details on the audio mixer you are using? Quote Link to comment Share on other sites More sharing options...
larryleffaovell Posted June 7, 2023 Author Share Posted June 7, 2023 Of course! Glad that someone is asking and may find it useful, too. In I'm going to take a learning curve in KiCAD "soon" to revise it to (overwhelmingly) SMD, w/o phone connectors to get a minimized version of that. 1 Quote Link to comment Share on other sites More sharing options...
Mathy Posted June 7, 2023 Share Posted June 7, 2023 Hello Larry Can you show us how the 1200XL looks on the outside with the MIDI ports? Sincerely Mathy Quote Link to comment Share on other sites More sharing options...
larryleffaovell Posted June 7, 2023 Author Share Posted June 7, 2023 (edited) 18 minutes ago, Mathy said: Can you show us how the 1200XL looks on the outside with the MIDI ports? Yes, have a look at my solution. I have removed the RF out because of UAV and inserted this one for audio out instead. Thats all. It's a 6.35 mm (1⁄4 inch) "phone connector", usually used for audio devices like guitars etc. Fits great for the hole of RF and is keeping solutions for -> phone connector of 3.5mm or -> cinch. Edited June 7, 2023 by larryleffaovell phone connectors 3 Quote Link to comment Share on other sites More sharing options...
DrVenkman Posted June 7, 2023 Share Posted June 7, 2023 15 minutes ago, larryleffaovell said: Yes, have a look at my solution. I have removed the RF out because of UAV and inserted this one for audio out instead. Thats all. It's a 6.35 mm (1⁄4 inch) "phone connector", usually used for audio devices like guitars etc. Fits great for the hole of RF and is keeping solutions for -> phone connector of 3.5mm or -> cinch. So your solution provides audio-only, correct? You don’t have jacks or a breakout cable for serial MIDI IN/OUT data? 1 Quote Link to comment Share on other sites More sharing options...
larryleffaovell Posted June 8, 2023 Author Share Posted June 8, 2023 10 hours ago, DrVenkman said: So your solution provides audio-only, correct? You don’t have jacks or a breakout cable for serial MIDI IN/OUT data? Correct. I didn't want to drill any extra hole into this very rare system. MIDI sound is coming from a S2 wavetable AddOn to the MIDI-XEL, hence the audio mixer. For an "live on stage" (not really) and extraordinary appearance I'm using a mostly full blown 1088XEL and a MIDI-XEL II to a MT32 (or similar GM) synthesizer. 2 Quote Link to comment Share on other sites More sharing options...
larryleffaovell Posted June 10, 2023 Author Share Posted June 10, 2023 And if you are already satisfied but don't know how to place one of the pcb's because of possible short circuits, just print (one of) the attached "container", drop-in the pcb and place it and where you want and you are set. Audio-Mixer.zip MIDI-XEL.zip 1 Quote Link to comment Share on other sites More sharing options...
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