The use of the port-interface-IC "MAX 232" is for my meaning the better
way to connect a MIDI-device with an AMIGA serial-port.
This IC transform the signals of TTL to CMOS or CMOS to TTL in the
correct way. The input- and outpulevels are precisely of the guiding
principle. So it is not necessary in our case to put an optocoupler to
the MIDI-In. That makes it for us some easier.
If MIDI-IN will not work in your case, then connect the pin 10 and 11
of the IC. Then it should work.
There is a special thing with the DB-50XG:
After switch power on, the RESET-Pin of the Card (26) MUST be connected
to the digital ground for a time of 200 milliseconds. So it will be
In the other way the card won't work !!!!!
I have on the PCB made the possibility to bring this out of the device,
so you can make always at the begin and when you will a hardware-RESET.
It is usefull, if anywhat is wrong and the card sounds and sounds and
If you are using the Bars&Pipes-sequencer:
I've written a
Toolset for my DB-50XG.
With this Toolset you can program the DB-50XG in all possibilities
witout to now how to handle the cryptical SysEx-commands.