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Vielen Dank!

Hallo Franz!

Das wäre schön!

I also have a couple of books like the one from Rodnay Zaks on the 6809 and Mein Dragon 32 that I’ll scan when I have some time.

Vielen Dank!

I have a friend's wedding in Spain the 20th of September, so it should be just about right.

Nice!

I saw the manual of the original Rulaford MIDI interface for the CoCo and the ports were different, so the jumper is a nice touch.

Do you have the Dragon version of the manual by any chance?

I found another funny thing :mrgreen: When operating the disk drive (which is funny because you cannot have the disk cartridge and the midi cartridge together unless you have a MPI or similar device), the program tries to OPEN"I",#2,"LARGO.M10" which in the Dragon results in a ?DN ERROR Where can I ...

I also found this: https://github.com/go4retro/MIDIMaestro Which references the Rulaford MIDI Interface, could that be it? Looking at the V1 schematics, which should be closer or that of the original cartridge, turns out that address bits 5,6,8,9,10,11,12,13,14 and 15 are fed into the 74LS133 NAND g...

Heh, The code is writing to port &HFF74 as if it were a control port and &HFF75 like a data port: 440 :'PLAYBACK 450 CLS:GOSUB 90 455 T2=60000/TEMPO 460 POKE&HFF74,3:POKE&HFF74,22 :'SET MIDI 470 POKE&HFF75,207:POKE&HFF75,NS:'STYLE 480 INPUT "ENTER TO START";ST 490 FOR J= 0 TO 3:'VOICE 500 POKE&HFF75...

Maybe it controls a cartridge hosting a midi device?

The program is written in Basic, so we could take a peek...

Behold!

A fully assembled Dragon Beta board!

I need to make a video cable and probably use my trusty Meanwell PSU to power it. Fingers crossed...

This is going to come in handy, thanks a lot!