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Thread: Tascam Midiizer MTS-1000 Manual & Cables

  1. #101
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    I have a source for old e-proms as i get them in for my day job, usually fixing up old control equipment, the trouble is getting them programmed. If you could find a tech company with a e-prom reader they would be able to suck the program out of a good e-prom and load up a new one. LINK to e-prom

    Alan.

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  3. #102
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    Awesome post!
    Experience and knowledge are totally different skill sets

  4. #103
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    Yes. Whenever I get a new piece of equipment from the 80s or 90s, I tend to back up the EPROM and run the system off a copy to make sure it worked. So I could easily do this - assuming I had access to a working MTS-1000 :-/

  5. #104
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    Never got any reply from Tascam Germany.

    As I recently wanted to update my Kurzweil K2000 sampler keyboard firmware version I looked around for some EPROM replacements. Kurz OS 3.87C costs around 40 with postage for a pair of EPROM's on EBay, WTF?

    Anyway I found an online source with the BIN files for many old '90's keys & FX's firmware /EPROM's DBWBP.com - Synthesizer ROM archive

    So the cheaper option is I bought the EPROM reader / writer for 28 & then buy a pair of OTP EPROM's for 3-4 instead, plus I get to back up the Midiizer EPROM's afterwards.

    The Midiizer EPROM datasheet
    Hitachi Semiconductor - datasheet pdf

    I'm assuming this OTP will do the job in replacing the Midiizer EPROM?
    AT27C256R-70PU MICROCHIP, EPROM, One Time Programmable, 70 ns, 32K x 8bit, 256 Kbit, 4.5 V to 5.5 V, DIP-28 | Farnell element14
    Last edited by trancedental; 06-02-2017 at 12:15.

  6. #105
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    Earlier in the thread someone was saying that their Midiizer had two EPROMs, a 27C256 and a 27C512. If that's true, you'll need one of each type, since the 512 is twice the capacity. I've not tried using OTP EPROMs personally, I prefer the UV ones with the window because I can wipe them and try again if something went wrong.

  7. #106
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    I've managed to read the two pairs of Tascam Midiizer MTS-1000 EPROM data & saved them as BIN files.

    WORKING

    C 1.22 (control PCB top) HN27512G DIP28
    M 1.21 (main PCB bottom) HN27C256G DIP28

    FAULTY UNIT

    C 2.00 (control PCB top) HN27512G DIP28
    M 2.00 (main PCB bottom) HN27C256G DIP28 (This might be faulty as it doesn't appear on the LCD screen but it's code seems similar to the M 1.21 version?

    I've ordered the cheap OTP eproms just to see if I can get them working on the Midiizer but will buy an UV eraser to wipe & reuse the 10 erasable EPROMs that I already have.
    Last edited by trancedental; 06-16-2017 at 12:48.

  8. #107
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    Cool! Any chance you can send me the data?

  9. #108
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    Thanks. I can't see anything blatantly wrong with the V2 files, I can see text strings in the C chip files so it's not like the entire thing is garbled. The M chip doesn't really have anything human-readable in it but structurally they look similar. Good luck with the programming!

  10. #109
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    Burned a new pair of C 1.22 / M 1.21 files but my non working Midiizer only recognises the C 1.22 chip, also tried the old working M 1.21 chip with no luck.

    Then I fitted the non working chip pair C / M 2.00 & they are recognised in my working Midiizer which originally had the earlier software version chips.

    Looks like there's a problem somewhere with the non working lower Main PCB, that means swapping the boards out completely!

  11. #110
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    I should point out I have never seen a circuit board of a Midiizer, but if this makes sense, have a very close look at the soldering on the e-prom socket, use a magnifying glass and check that the solder has not got a hairline crack from removing the e-proms, I would touch the solder with a soldering iron anyway just to check it's not a small crack or a dry joint.

    Alan.

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