27 Jun
2005
27 Jun
'05
11:54 a.m.
Does anyone happen to have ROM dumps of from the RML 380Z CPU board?
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".
ps. are 2716's known for failure in this way?
cheers
Jules
27 Jun
27 Jun
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
28 Jun
28 Jun
6:53 a.m.
On Mon, 2005-06-27 at 23:16 +0100, Tony Duell wrote:
Aha no I hadn't - and you were spot on! :) I didn't realise that TI's
2716 was a three rail device and their 2516 was equivalent to everyone
else's 2716. You learn something new every day and all that :-)
The CPU board ROMs in both this 380Z and my own one are TMS2716's as it
happens (yet the 80 col board character ROM in the one machine uses a
TMS2516)
I wonder if I can modify my programmer to at least read three-rail
devices (it'd be handy to be able to read 2708's on it anyway). Maybe
via a little carrier that supplied the other two rails to the chip. I'll
have to grab the relevant datasheets...
cheers
Jules
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...
10:48 a.m.
On Mon, 2005-06-27 at 23:16 +0100, Tony Duell wrote:
Aha no I hadn't - and you were spot on! :) I didn't realise that TI's
2716 was a three rail device and their 2516 was equivalent to everyone
else's 2716. You learn something new every day and all that :-)
Don't worry, that caught me out <mumble> years ago. And I am still making
equally stupid mistakes...
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...
The CPU board ROMs in both this 380Z and my own one are TMS2716's as it
happens (yet the 80 col board character ROM in the one machine uses a
TMS2516)
As I mentioned, that's what hte infomration file (which is what RML
called the technical manual) shows.
I wonder if I can modify my programmer to at least read three-rail
devices (it'd be handy to be able to read 2708's on it anyway). Maybe
via a little carrier that supplied the other two rails to the chip. I'll
have to grab the relevant datasheets...
It will deepnd on your programmer. If it does something clever (like
tries to read at non-standard Vcc levels to check the data is reliably
programmed, or if it chacks the device's Vcc current), it may not work.
Otherwise it should be fine.
-tony
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