21 Jul
2004
21 Jul
'04
10:54 a.m.
Tony Duell wrote:
The Dragon is based round 3 chips. The 6809E processor,
the 6883 SAM,
which handles address decoding, DRAM control, video address generation,
etc, and the 6847 VDG which contains the character generator, video shift
registers, etc. Since you're getting stable video, I guess the SAM and
VDG are doing something (maybe not the right things, but let's assume
they're OK for the moment). It sounds like the SAM and RAM are not being
initialised properly, which sounds like a CPU, ROM, or RAM fault. Or PSU,
reset circuit, or...
-tony
i hear this is what made the old encryption / decryption method work for
analogue SKY boxes....... one chip was in the card and the other 2 was
in the box - apparently the same 3 chips as in the dragon (don't ask me
how though - i don't know- i've never understood)
DJ