Since the RAM on a standard QL was only ever intended to extend up to
$BFFFF, would the test ever go beyond that.
Cheers
Malcolm
On 21/02/2011 14:50, Phill Harvey-Smith wrote:
Malcolm Lear wrote:
Ah, that brings all the memories back. I'm sure the chips were
protected and I had to switch all combinations of input to deduce the
equations.
I did wonder about that :) :) I may have a go at hooking them up to an
AVR and getting it to scan and record for me :) :)
The good news is that I can lay my hands on a board I manufactured
and read back the equations from that.
Excellent.
Unfortunately the earliest I can do that is next week.
No probs.
I seem to remember that initially the ROM is mirrored and access to a
particular range of addresses (the jump) switches it out replacing it
with RAM.
Indeed, I have worked out this much, however I think the RAM test
takes place before this point so will hit the mirrored rom and only
see 640K :( So there must be something else afoot :)
Cheers.
Phill.
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