4 Dec
2006
4 Dec
'06
3:54 p.m.
Tony Duell wrote:
I can't recall what it looks like now - I've never seen the real board, and
the only photo I knew of was on the 8bs website (which has been down for many
many months now, although it will be coming back one day we're promised!)
However, from memory, the board intercepted the signals to/from the video IC
socket, and then the Atom's displaced video IC (umm, a 6847 I think) plugged
Oh, right (and yes, the video chip is a 6847)
Gordon JC
Pearce wrote:
What does the colour board look like, and where does it fit? I still have my (almost) fully-loaded Atom
I was hoping that by 'fully loaded' you meant that it had the BBC BASIC,
Econet and Colour boards :-) (I've never seen a real example of the latter,
although I know that there's at least one in the UK) into the colour board itself. I think that the 6847
chip was colour-ready
anyway; it's just that the standard Atom doesn't include the necessary
From what I rememwebr of the 6847 datasheet, it
generates the YUV signals
for _NTSC_ colour. I guess the colour board converted
those to PAL.
circuitry to make use of it (I think the floating
point ROM actually contains
the code to make use of the board). I also have a funny feeling that the
colour board didn't provide component RGB - it'd only allow colour via the
modulator and displayed on a TV.
That is not suprising. Getting RGB froma a 6847 is a little more complicated.
-tony