Fujiyama wrote:I've opened up my C-Lab "Export" (adds 3 MIDI OUT ports through the modem port with Notator/Creator SL) and found a single unidentified IC marked "EP210".
Foxie wrote:I'm also mystified by R7 - a 47K resistor from output Y7 to Vcc. Y7 is already at logic high, and it isn't used by anything. It appears to be a complete waste of a resistor!
czietz wrote:Notice that Fujiyama's photos show that the PCB would also accept a PDIP-20 package; thus a different IC. Maybe the resistor was needed for that one?
crashman wrote:The capacitors are 220uF 16V.
The two middle diodes are marked 48F.
The one in the side... I can read 5V6, PH and BZX
Fujiyama wrote:Could some of those hardware faults be rectified and thereby improve its performance, if only a little? Or does the software side of it (Notator/Creator) prevent any of those fixes to be recognized and taken advantage of?
Cyprian wrote:As far as I remember MIDI OUT needs exactly 31250 bps, and ST RS port has max 19200 bps. Therefore how does it work?
Cyprian wrote:In additional, I see there three MIDI OUTs, 3 x 31250 = 93750 bps. Is it possible to reach 93750 through 19200 bps pipe?
Cyprian wrote:good to know,
maybe would be possible to connect two STs with 307200 bps
Foxie wrote:You probably won't get any improvement in MIDI performance, but you could make it more reliable / less likely to die from ESD. I propose the following mods, but they're completely untested - use at your own risk!
Fujiyama wrote:You mentioned the diodes marked in green should be schottkly types, but which specific schottly diodes?
Fujiyama wrote:I have no idea who designed these PCBs but several years ago (2007) I investigated who "EES Moelln" could be (it's printed on all of those C-Lab/Emagic boards such as the Export, Unitor, Combiner etc.) and succeeded in finding Elektronik Entwicklung Service (EES) Möln in Germany. So I contacted them to ask about the possibility of releasing the schematics etc. and actually got a reply. They told me that they had stopped production of those Atari related boards, didn't have any left and didn't know who owned the copyright. I didn't pursue finding out more, but if anyone else is interested, here's their website's "about" page which indeed mentions the Atari ST. There's contact info there too.
Fujiyama wrote:Regarding high speed modifications for the ST I believe the ST_ESCC gives two additional serial ports like the Mega STe has while the RSVE only makes the existing modem port go faster. I've got both installed in my STe but never really used the ST_ESCC (the geek in me had a period I just wanted to install every modification I came across)
Fujiyama wrote:Here you go, the Unitor-2.
Foxie wrote:What I'm currently trying to figure out is how they're writing to the cartridge port. The old trick uses the address lines as data, and it could be the Unitor uses that trick too. But it looks like the Midex uses another trick I'm not aware of. Somehow, they're able to get the data to appear on the actual data lines without causing a bus error.
Foxie wrote:Do you happen to know if the Unitor 2 and older Unitor are compatible at the software level?
Fujiyama wrote:The Unitor-C has the copy-protection hardware for Creator SL built in and only works with Creator SL.
Similarly the Unitor-N intergrates the copy-protection hardware for Notator SL and only works with that software.
Other than that I believe they have the same features, but don't quote me on that. I'll see what I can find out about the Unitor-C I have.
Or maybe I misunderstood your question...
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