27 Jun
2005
27 Jun
'05
3:16 p.m.
Does anyone happen to have ROM dumps of from the RML 380Z CPU board?
I cna;'t help you, alas. IIRC, some RMLs used the TI 3-rail 2716s that
most programmers can't handle. I assume you've checked for this...
I've just checcked my 'Information File'. The CPU board schematic says
'2708 or TMS2716' for the EPROMs. In other words 3-rail (+5V, +12V, -5V).
There is no EPROM on the 40 col VDU, the 40/80 col one shows a 2516/2732.
That's a signle-rail type (TI were the odd-one-out here, their 2716 was a
3-rail part, their 2516 was a signle-rail one like everyone else's 2716).
I wonder if that's the problem you're having...
All three 2716's on the board in front of me seem to have gone blank.
(I've verified that the 2716 chargen ROM from the video board reads OK,
so it's not my programmer failing to read properly!)
The three ROMs in question are labelled "4.0B" (M0, M1 and M2).
My 380Z fileserver won't have the same ROMs in it, and my own 380Z
'desktop' only has a pair of ROMs in it labelled "3.4E".
I am pretty sure that my 380Z has COS 3.4 (and I assume that's what the
label is referring to
-tony