See cloudscatze's post for the pc9801 pinout, and be sure to remember which surface and edge of the card conector is which! You don't want to put 12v on the 5v pin or you'll blow the whole thing to kingdom come.

Also, if possible can you get some high-resolution pictures of the lapc-N card (especially of the inside if you separate the two 'halves' of the card); there don't seem to be any pictures online of what the inside looks like and what mask roms/reverb rom etc the card uses (where the labels of the chips are visible in the picture).

LN

It's a surfacemount OPL2
YM3812

Thats a very late datecode for an opl2 actually.

Thanks so much for the LAPC-N picture! I've already added the details to the page.
Do you have the serial number for that particular LAPC-N? it should be a sticker on the bottom with Z??? or something on it.

I'm also looking for pictures of the later MT-32 (the rack-mount 2.0 model with the headphone jack).

Lord Nightmare

I'm working on a project to document exactly which revisions of which chips were used in each different type of la32-based hardware.
You can see my progress so far at my wikipedia userpage:
http://en.wikipedia.org/wiki/User:Lord_Nightmare
(also I stuck the list of roland documents CloudSchatze has at the bottom so I could remember what to keep an eye out for, ignore it please)

I know that several people here own some of the less common la32-based hardware (mt-32 w/headphone jack, cm-32l, cm-64, mt-200, mt-100, cm-500, and possibly lapc-N and cm32l-n. I'm also looking for pcb pictures of the d-5, d-10, d-20, d-50 and d-70 keyboard-synthesizers and the d-110, d-220, and d-550 rack-mount versions of said synths. also the E-5, E-10, E-20 and E-30.)
I'm looking for pictures of the pcbs of any la32-utilizing hardware, which are of high enough quality to see chip numbers and silkscreen numbers.
Also, serial numbers of the boards pictured would be helpful too. I was hoping to add these to my userpage, I can credit them anonymously if preferred.

If you can't get a good picture of a particular board or if you lack a camera, you can just add the details by hand to the wikipedia userpage.
To determine rom versions: if product uses eproms, they should have a sticker on them with three red dots, each over a number. The version is top.middle.bottom where top/middle/bottom are the number with the red dot over it at the top/middle/bottom of the sticker.
If the product uses mask roms, the version can be determined (somehow) from the r1xxxxxxx number on the chip or chips.

Thank you, and have a good day!
Edit: Added CloudSchatze's LAPC-N
Edit: Added My own D-110 which arrived (though needs some repair)

Lord Nightmare

you can use "autopano pro" to automatically 'panorama' together a several image block. even the shareware version can save a panorama'd image like that, even if the author CLAIMS it cannot (it does it automatically by default!)

Lord Nightmare

Btw by the part number, I'm starting to suspect the LA32 is actually an MCU and perhaps not a real ASIC IC at all!
Why?
MB8xxxx parts are made by Fujitsu, and they're DSP/MCU chips.
The MB86232 and MB86233 are the 'TGP' DSP chips (also known as F-DSP4 or f-DSP5 iirc) used in the Sega Model 1 3D hardware from 1994ish.
This makes me think the LA32 may be an FDSP-2 or FDSP-3. The only problem is the dates don't line up. The f-dsp2 and i THINK F-dsp3 WAS made in 1987 iirc, so it IS early enough, I believe.
One of them, I forget which version, is called the MB8764
Being an MCU would also nicely explain the la32 part number change: The different la32 versions have a different internal ROM.

Another BIG question of mine is what sort of MCU the Reverb chip is. Based on the RWI documentation, its supposedly a simple dsp with 16 versions each of 4 different programs which run depending on what cycle a sound plays at on the 32.767mhz clock. This chip being a fujitsu MCU is also possible. It would be nice if someone had additional information on what architecture, etc it is.

If anyone has a dead mt-32 btw with fried guts, I'm interested in decapsulating the LA-32, the reverb chip, and possibly the gate array.

Lord Nightmare AKA Jonathan Gevaryahu

Wait... Does this mean the rev 00 and early rev 01 mt-32s are actually BETTER quality(only one bit missing) than the late rev 01s, the cm-32l, cm64, etc?

Lord Nightmare

Well, its new information to ME, and to at LEAST one other person on this board who's post I was reading earlier.

Service notes? Where do you get those?
Dammit, why does everyone here have all these mt-32 docs I've never even heard of?

Jonathan Gevaryahu AKA Lord Nightmare
moc(t0d)liamtoh(t@)uhayravegj

Curse you, powers of 2! You've betrayed me!


Jonathan Gevaryahu AKA Lord Nightmare
moc(t0d)liamtoh(t@)uhayravegj

I apologize for the 32768 vs 32000 mixup on VOGONS, I incorrectly thought a power of 2 xtal was divided down for the DAC driving.

Jonathan Gevaryahu AKA Lord Nightmare
moc(t0d)liamtoh(t@)uhayravegj

If I had a copy of 1.06, I'd do it in a second, but unfortunately I do not.
Where can I get a copy of the ROM revision guide?

Sorry, at least I tried.

Interesting, that means that what the RWI author said in his docs is bull***t, unless the code for the 2.x rackmount mt-32s really is lousy and doesn't respond as fast as the 1.x ones.

Thanks for bringing that information to my attention.


Jonathan Gevaryahu AKA Lord Nightmare
moc(t0d)liamtoh(t@)uhayravegj

Ok, I have two MT-32s, and have asked around about other mt-32 versions, and I've compiled a lot of the information on my wikipedia userpage. (PLEASE don't deface it, although feel free to add your own units.)
http://en.wikipedia.org/wiki/User:Lord_Nightmare

Here's the new info:

The MT-32 PCB-00 and MT-32 PCB-01 are IDENTICAL IN OPERATION, other than the la32 being BGA (I call it revision 0) in the 00 and QFP (revision 1) in the 01, and the 00 having the PCM-ROM split into two roms, and the 01 having one rom, and the gate array being changed.
How do I know this?
I own two MT-32s. one is a 00 and one is a 01, and BOTH OF THEM use the SAME CONTROL ROM REVISION. Contrary to what was posted in the last versions thread, the 1.07 rom has NO PCB-01 specific changes, because it runs FINE on a PCB-00.

The pcb-02/01a (or whatever it is called) on the other hand (used on any mt-32 with a version 2.x.x rom, the ones with the demo music included), IS different.
That one uses the revision 2 la32 which has the volume boosted internally instead of needing the external 'wired shifter', and it may have a larger set of control roms than the earlier versions could handle, to hold the 4 builtin musics. It also has the volume knob hooked up differently, directly to the output amplifier as opposed to the cpu. The cpu is also a 16mhz 8098 instead of a 32mhz 8092. And it DOES respond slower, according to the RWI mod manual, linked from this forum earlier.

You can also see on my page that I'm trying to get the revision numbers from the 'version screen' of all the different mt-32 revisions. I'm also looking to get all the different control and reverb rom revisions dumped so they can be properly preserved and researched. (This counts also for non mt-32 Roland LA hardware such as the D110.)

Jonathan Gevaryahu AKA Lord Nightmare
moc(t0d)liamtoh(t@)uhayravegj