19 Jul
2004
19 Jul
'04
6:36 a.m.
On Jul 19, 15:29, Jules Richardson wrote:
Finally found the five minutes to see if my Dragon 64 works. It
doesn't.
I have a Dragon 32,. working last time I checked. If you're coming
here this week, you can borrow it for comparison testing if you like.
--
Pete Peter Turnbull
Network Manager
University of York
19 Jul
19 Jul
7:07 a.m.
On Mon, 2004-07-19 at 18:36, Pete Turnbull wrote:
On Jul 19, 15:29, Jules Richardson wrote:
ta for the offer - I neglected to mention that I actually *have* a
Dragon 32 too, again which I'd never found the time to test!
After getting frustrated with the '64 I tried it, and it runs - but
starts with a green background and startup text in the top-left, which
seems to be different to what the '64 is trying to do...
Now, the only 18 pin IC on the '32 is an LM1889, which apparently is
some sort of TV modulator IC. If that's what's missing on this D64 it
might explain my dodgy video output :-) (although without it I'm pretty
surprised I'm seeing anything remotely stable on the display; possibly
the machine has some other fault too)
If someone can confirm that my missing chip *is* an LM1889 then I can
desolder the one from the '32 and try it in the '64...
cheers
Jules
Finally found the five minutes to see if my Dragon 64 works. It
doesn't.
I have a Dragon 32,. working last time I checked. If you're coming
here this week, you can borrow it for comparison testing if you like. 
9:46 a.m.
Sorry , now I'm getting confused . I was thinking of the 64k ramboard which
had a composite video o/p IIRC. Ignore my other post therefore.
You will need that lm1889.The text you should see will be a Dragondata
copyright line with something like 16 basic assembler-copyright Microshaft -
in top LH corner. The Dragon suffers from terrible dot-crawl interference
and most people used to stick a 0.1uF cap across the colour s/c crystal to
kill the colour - unless they were playing games.
Geoff.
----- Original Message -----
From: "Jules Richardson" <julesrichardsonuk(a)yahoo.co.uk>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Monday, July 19, 2004 8:07 PM
Subject: Re: Dragon 64 fixing...
Now, the only 18 pin IC on the '32 is an LM1889,
which apparently is
some sort of TV modulator IC. If that's what's missing on this D64 it
might explain my dodgy video output :-) (although without it I'm pretty
surprised I'm seeing anything remotely stable on the display; possibly
the machine has some other fault too)
If someone can confirm that my missing chip *is* an LM1889 then I can
desolder the one from the '32 and try it in the '64...
cheers
Jules
20 Jul
20 Jul
8:52 a.m.
Jules Richardson wrote:
If someone can confirm that my missing chip *is* an LM1889 then I can
desolder the one from the '32 and try it in the '64...
cheers
Jules
Don't know if there's a big difference between the UK and the US version
(besides power and television support of course). But these are
closeup pics of my Dragon64's motherboard (Tano version). It appears
someone stuck an eprom with COCO based stuff on it in there. Besides the
Centronics reference, anyone have any idea what it might be?
Warning - these are large (half a meg each).
http://www.classicgaming.com/gamingmuseum/dragon1.jpg
http://www.classicgaming.com/gamingmuseum/dragon2.jpg
http://www.classicgaming.com/gamingmuseum/dragon3.jpg
Marty
ClassicGaming.Com
Atari Gaming Headquarters
www.atarihq.com
7460
days inactive
7461
days old
3 comments
4 participants
participants (4)
-
geoffreythomas＠onetel.net.uk -
julesrichardsonuk＠yahoo.co.uk -
pete＠dunnington.u-net.com -
wgungfu＠csd.uwm.edu