1 Nov
2002
1 Nov
'02
12:14 p.m.
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
True, but you'd be amazed at what some people have
problems with :-)
Well, even at my advanced age I can still spot a mains connector ;>)
> Thanks for the information. I'll be poking
around this critter more
this
weekend. Any
gotchas I should know about?
If you take the case apart, you need to realise that the monitor is not
separately enclosed inside/ This means that (a) there's high voltages
around (actually, there are also high voltages on the non-encased SMPSU
boards in there too...) and (b) the CRT neck is exposed and vulnerable.
It is possible to catch the end of the neck on the CPU board chassis when putting the case together, and crack it. Then
you're looking for a new
CRT.
The monitor PCB + CRT are fixed to the top part of the case, everything
else is on the baseplate.
The service manual was helpful in opening the case. I show a lot of
respect for CRTs when handling them! I had to remove the deadly-looking
bare PSU mounted on the drive enclosure in order to work on the drives, so
it also got the kid-glove treatment . . .
What I meant by gotchas was: anything troublesome about the serial or
parallel i/o? Any known bugs in the ROM? The manual very nicely documents
the ROM routines (if the book is accurate) so this thing should be fun to
do some assembler programming on.
So far, despite all I've heard about "trash 80," this system looks pretty
friendly.
Later --
Glen
0/0
1 Nov
1 Nov
8:11 p.m.
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10:50 p.m.
On Sat, 2 Nov 2002, Tony Duell wrote:
The serial port is standard, but with rather more pins
wired than you'd
expect (I think some of the 'secondary' ones are used too).
While on this subject, does anyone remember the 300 baud pulse dial Lynx
modems? I have a couple, but I need to find another of the right angle pc
boards (I'll put up a photo as soon as I dig out the one I have) that
originally came with them so that I can connect one each to both my model
3 and model 4. I could also use another one of those modems to dedicate
for use on my model 1 if someone has one laying around that they don't
plan to use. (Yep, this thread has bitten me, and I'm planning to do
something with my TRS80s again ;P)
-Toth
2 Nov
2 Nov
11:35 a.m.
New subject: TRS80 Model 3 i/o connectors (printer support)
About printers:
The one thing to remember about the TRS line is that
the printer output is not emitting <CR><LF> pairs but
rather <CR> with implied <LF>, so most of the
DOS-centric printers will be unhappy. (<CR> is
shorthand for the carriage return character, ASCII
code 13 decimal; <LF> is linefeed, ASCII code 10
decimal)
You used to be able to tell printers that they should
interpret <CR> as <CR><LF>, but I don't know if the
newer ones will still do that.
Or, you can set up the TRSDOS O/S to add them in (at
least under LSDOS/TRSDOS on a Model 4).
It's been awhile!
-- Frank
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
=====
= M O N T V A L E S O F T W A R E S E R V I C E S P. C.=
Clayton Frank Helvey, President
Montvale Software Services, P. C.
P.O. Box 840
Blue Ridge, VA 24064-0840
Phone: 540.947.5364 Email: msspcva(a)yahoo.com
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What I meant
by gotchas was: anything troublesome
about the serial or
The parallel port is fairly sane too. The strobe/
signal is generated
automatically when you write to the data output
latch. There's an 8 bit
input too, one of which is used for Busy.
It should work with any normal parallel printer.
4:19 p.m.
New subject: TRS80 Model 3 i/o connectors (printer support)
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8092
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4 comments
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participants (4)
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acme_ent＠bellsouth.net -
ard＠p850ug1.demon.co.uk -
msspcva＠yahoo.com -
tothwolf＠concentric.net