19 Jul
2004
19 Jul
'04
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