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
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-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)