What are you going to do with these? Is there a ROM archive for DEC printer ROMs?
On Mon, Sep 21, 2015 at 3:14 PM, Jonathan Gevaryahu <[email protected]> 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] > > -- Bill vintagecomputer.net
