Thanks. I will see what I can do. B Bill Degnan twitter: billdeg vintagecomputer.net On Sep 21, 2015 11:02 PM, "Jonathan Gevaryahu" <[email protected]> wrote:
> There isn't a complete archive of these ROMs in existence currently. Pete > Turnbull's site does contain an archive, but it isn't anywhere near > complete. The drivers in MAME/MESS also act as a sort of archive as well. > > The direct prompt of this request was the desire to get one or more of the > dot matrix teleprinters running in MAME/MESS, the progress of which can be > seen at > https://github.com/mamedev/mame/blob/master/src/mess/drivers/decwritr.c , > with the LA120, but the ROMs I have right know for the LA120 fail their > built-in checksum test, so I'm stuck at a development impasse until I can > get some more roms to work with (or correctly re-dumped copies of the > existing roms). > > The end result of what I'm trying to do would hopefully look something > like this: https://www.youtube.com/watch?v=l20V7f2sM8c > > On 9/21/2015 3:19 PM, william degnan wrote: > > What are you going to do with these? Is there a ROM archive for DEC > printer ROMs? > > On 9/21/2015 3:14 PM, Jonathan Gevaryahu wrote: > >> Does anyone have an LA36, LA120 or LAS12, LA34, LA100, or LA210 >> somewhere which they could dump the ROMs from? >> >> Notes: >> The LA36 uses several proms for its discrete cpu, and 2 character >> set roms which I believe have an 'odd' pinout. >> >> The LA120, one of the roms on the '2 rom version' is an 8k 2364 24 >> pin chip which is a bit annoying to dump, since you either need a >> 2364->2764 24->28 pin adapter, or (better) a programmer which can >> dump MC68764 or MC68766 24-pin 8k eproms (which have the same >> pinout as 2364). The other rom on the 2 rom version is a 2k 2316 >> 24 pin chip. >> The oldest LA120 version uses 5 roms, all 2k 2316s. The code on >> the 5-rom version and the 2-rom version may very well be the same >> (the first 4 2k chips consolidated to one 8k chip), I'm not sure. >> Would be nice to get dumps of both versions. >> The LAS12 uses different code from the LA120 and to the best of my >> knowledge all LAS12s use 2 roms, one 8k and one 2k. >> >> LA34, theres at LEAST five firmware versions, almost certainly >> six, and possibly as many as seven. There is also a special >> firmware for a 'rom expansion' daughterboard. >> The 1978 LA34 "54-13374" motherboard has a bizarre Intel i8355 >> mask rom+io chip in it, plus a separate rom as well. (there are at >> least two versions of said i8355+rom firmware). Dumping the i8355 >> is not for the faint of heart, it would likely be easier to insert >> a 'dumping program' eprom into the single rom's socket, and use >> the LA34's cpu to spit its own rom contents out via serial. >> The 1980 LA34 "54-13747" motherboard lacks the i8355 and uses 2 or >> 3 mask roms or eproms on it instead (and 74xx logic for the i/o). >> There are at least three rom revisions for this, possibly four or >> five. >> >> LA100 (AKA LW100)... I have no idea. There's definitely at least >> one rom revision. Also to the best of my knowledge neither the >> maintenance print set nor the technical manual for the LA100 are >> scanned (they certainly don't appear at >> http://bitsavers.trailing-edge.com/pdf/dec/terminal/la100/ ), >> which makes it difficult to know. >> >> > > -- > Jonathan Gevaryahu > [email protected] > [email protected] > >
