Re: Orpheus II soundcard thread
Posted on 2022-07-21, 01:06
Definitely looking forward to see how this develops. I'd love a GUS card. But I can't justify the cost they go for these days.
Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?
Posted on 2020-08-21, 10:18
I've been there. It sucks. I hope you find a new job quickly.
Re: MT-32 ROM 2.00, old version?
Posted on 2020-06-27, 13:25
Never seen that before. ROM version 2 is for MT-32 "new". Which is what that circuit board is. But it is in an MT-32 "old" case and the headphone jack is not installed.
Re: MT-32 Service Notes 1st/2nd Edition
Posted on 2020-06-14, 23:33
Thank you all for the scans of MT-32 service notes 1st & 2nd edition. They are very difficult to find.
Re: 6 or 8 channel audio mixer
Posted on 2020-06-12, 12:56
Here is one with three stereo inputs. Rolls MX51S Mini I used that before I got my 8 stereo input Eurorack mixer.
Re: 6 or 8 channel audio mixer
Posted on 2020-06-06, 02:14
I use a Behringer Eurorack Pro RX1602 16-Input Line Mixer. Rackmount 1U. Eght stereo channels. Per channel mute, balance, and level. Line out and headphone out. And even some cool blinking LEDs.
Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?
Posted on 2020-05-06, 15:09
This is the most "teaser" like you'll get for a while. https://www.youtube.com/watch?v=uQwjjuAjmz8 Once the initial run is over, I might be able to deliver a few more, as I have an excess of InterWave chips and the PCB design can be replicated as many times as desired. But no definite plans there …
Re: MT-32 motherboard revisions?
Posted on 2020-05-04, 20:45
Yup, Luke at console5.com has all the best cap kits.
Re: MT-32 motherboard revisions?
Posted on 2020-05-04, 02:28
darry wrote on 2020-05-04, 01:12: If you have a tester, please post the condition of the original capacitors . I don't have an LCR meter.
Re: MT-32 motherboard revisions?
Posted on 2020-05-04, 00:49
PS: Unlike the ROMs used on 01 board which are Roland branded and soldered on. And good luck finding those masked ROMs in case it fails (not because of it's limited lifespan but for different reason - ie. ESD when you are fiddling inside of the MT-32). So 00 revision definitely has a big advantage …
Re: MT-32 motherboard revisions?
Posted on 2020-05-03, 23:24
Any way to tell whether the ROMs are OTP or MASK Roms ? EDIT: Without decapping them You can usually guess based on the part number and or company logo on the package. ie. if the chip is branded 'Roland' with a proprietary part number it is probably a Mask ROM. If it is branded AMD or NEC, etc. and …
Re: MT-32 motherboard revisions?
Posted on 2020-05-03, 22:52
OTP ROMs were just cheaper. OTP EPROMs are identical to UV erasable EPROMs, just they don't have the window to let in UV light. The data will still be corrupted over time. Also it takes a long time for UV EPROMs with exposed window in direct sunlight to be "erased" (hours if not days) and I'm not …
Re: MT-32 motherboard revisions?
Posted on 2020-05-03, 20:14
darry wrote on 2020-05-03, 19:57: The reason I want to use EEPROMs instead of EPROMs is that I would rather not have to buy a UV light source to erase them first (can you even still get new blank EPROMs?). Ahh, I understand.
Re: MT-32 motherboard revisions?
Posted on 2020-05-03, 19:33
What EEPROMs could I use to replace the EPROMS in mine ? You got me thinking of getting one of those TL866 programmers, dumping the original ROMs and writing them to EEPROMs . You wouldn't what to use EEPROMs. The MT-32 has no capability or use case to write to the firmware ICs. The correct EPROMs …
Re: MT-32 motherboard revisions?
Posted on 2020-05-03, 19:02
neither is more desireable than the other. mask roms just means you cant erase and reprogram them. I have an 00, it has 1.07. In this case, mask ROMs are definitely superior to EPROMs. The data stored in EPROMs will be corrupted over time. It takes seconds/minuets when exposed to UV light or …
Re: Roland MT-32 firmware 1.07 upgrade files & instructions?
Posted on 2020-05-03, 13:37
NewRisingSun wrote on 2020-05-03, 13:22: From MT-32 Service Information No. 100421A: […] Show full quote From MT-32 Service Information No. 100421A: "PROGRAM ROM: CM-32L: (IC6 ON MAIN BOARD) CM-64: (IC6 ON LA BOARD) Mask ROM LH53141J -- (PN.1520921401) -- THE LATEST VER.102" Outstanding!
Re: Roland MT-32 firmware 1.07 upgrade files & instructions?
Posted on 2020-05-03, 13:18
NewRisingSun wrote on 2020-05-03, 12:57: And because it was so much fun, the same procedure for the CM-32L. . . Thank you again NewRisingSun. Upgrading the firmware in my CM-32L is my next project after the MT-32. Can you confirm the CM-32L firmware just on IC6 (27c512)? As opposed to the MT-32 …
Re: Roland MT-32 firmware 1.07 upgrade files & instructions?
Posted on 2020-05-03, 12:48
darry wrote on 2020-05-03, 12:44: Are all hw versions compatible with post 1.x firmware ? I think firmware 2.xx are only compatible with the rare second version of the MT-32 -- the one with the headphone jack on the rear.
Re: Roland MT-32 firmware 1.07 upgrade files & instructions?
Posted on 2020-05-03, 12:46
Thank you NewRisingSun. It is great to get all this info in one place.
Re: MT-32 motherboard revisions?
Posted on 2020-05-03, 12:38
BloodyCactus wrote on 2020-05-03, 12:32: no, the 01 was made to reduce the cermiac PGA roland chip to a QFP chip. Roger. In that case I'd say the revision 01 is slightly more desirable (it has mask ROMs for the version 1.07 firmware).
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