Dragon 64 fixing...

From: Dennis Smith <m1dlg_at_soulwax.co.uk>
Date: Wed Jul 21 17:54:22 2004

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
Received on Wed Jul 21 2004 - 17:54:22 BST