ekarlin@csws5.ic.sunysb.edu (Erik S Karlin) (04/06/91)
I recently got the file midischem.lzh from ab20 and built the interface.
Other than not knowing whether the actual chips are bad (I doubt it) I have
checked and re-checked my work several times.
The problem is that I cannot get it to work.
I have a Casio CZ101 and tried MIDI in/out to MIDI in/out and
MIDI in/out to MIDI out/in and still nothing.
The software that I have tried is:
MED 2.3 , MED 3.0
CZEd, AlgoRhythms, MidiTools --from the fish disks
all did nothing.
Then what I did was look up in my 2000 manual the pinouts for the serial
port and noticed that pin 21 doesn't supply +5v as the schematic led me
to believe (I have a new (2 mos.) 2000 if it matters)
What I am wondering is has anyone gotten this interface to work, what
programs does it work with, are there any updates to this schematic,
am I missing something, or should I give up.
Please let me know if anyone has any suggestions.
Also- Since I did have fun building the interface
(and now that I have all of the materials)
are there any other hardware projects out there?
Like a digitizer or something????OS
ANY help would be greatly appreciated.
Erik
ekarlin@csserv1.ic.sunysb.edu
hamilton@intersil.uucp (04/09/91)
In article <1991Apr6.064405.25982@sbcs.sunysb.edu>, ekarlin@csws5.ic.sunysb.edu (Erik S Karlin) writes: > I recently got the file midischem.lzh from ab20 and built the interface. > Other than not knowing whether the actual chips are bad (I doubt it) I have > checked and re-checked my work several times. > The problem is that I cannot get it to work. > I have a Casio CZ101 and tried MIDI in/out to MIDI in/out and > MIDI in/out to MIDI out/in and still nothing. > The software that I have tried is: > MED 2.3 , MED 3.0 > CZEd, AlgoRhythms, MidiTools --from the fish disks > all did nothing. I had a similar problem with my homemade MIDI interface (actually it's a MIDI OUT only-it's all I need right now and it's just a resistor hardware- wise). It wouldn't work with any of the software I tried, but it did work whenever I'd probe it with my scope! It turns out that the schematic I had told you to connect the MIDI ground to shield ground (or something) rather than system ground (or whatever it was). When I moved the ground from one pin to the next, it started working fine. I'm sorry I don't remember exactly what I did, but it was a while ago. Anyway, it was ground-related. -- Fred Hamilton "Unlike most of you, Harris Semiconductor I am not a nut..." Santa Clara, CA -Homer Simpson
xbl21@EVAX.IASTATE.EDU (04/12/91)
In article <1991Apr6.064405.25982@sbcs.sunysb.edu>, ekarlin@csws5.ic.sunysb.edu (Erik S Karlin) writes: > > I recently got the file midischem.lzh from ab20 and built the interface. > > Other than not knowing whether the actual chips are bad (I doubt it) I have > checked and re-checked my work several times. > > The problem is that I cannot get it to work. > What I am wondering is has anyone gotten this interface to work, what > programs does it work with, are there any updates to this schematic, > am I missing something, or should I give up. I built a MIDI interface that was originally designed for the Amiga 1000 several years ago. A friend of mine adapted the power input for the 500/2000/3000. It works just fine. On mine I have two MIDI/in, two MIDI/out, and one MIDI/thru port. I will check out the one posted on ab20 and if it is not the same thing, I will see about posting my own project schematics. (IF I can find the disk ;-) Oh, and it works with everything I have tried it with... MED 2.0/3.0, Tiger Cub (gasp!), and Bars & Pipes. It has been used with a CZ-101 and a Roland MT-32. > Also- Since I did have fun building the interface > (and now that I have all of the materials) > are there any other hardware projects out there? > Like a digitizer or something????OS I have schematics for two audio digitizers. They are both basically the same. Mono, max speed only 14000 samples/sec, and the sound is not exactly commercial quality. I also have schematics for a Digi-View clone. That one looks like a real handfull so I haven't (and probably won't since I wouldn't have any software without buying the real DigiView hardware) built it. Those schematics MAY be on ab20 as well. I'll check if you are interested. > > > ANY help would be greatly appreciated. > > Erik > > ekarlin@csserv1.ic.sunysb.edu