10 Feb
2008
10 Feb
'08
7:42 a.m.
From: gordonjcp at gjcp.net
---snip---
The only thing is, a simple disassembly of the ROM leads nowhere,
possibly because the contents are scrambled in some way. I suspect but
haven't been able to prove that some of the lower address bits are
flipped, possibly to avoid routing problems on the board.
Hi
It should be relatively easy to trace the board to see if
there are any swapped address lines. Most circuits at most
have an address latch to catch the multiplexed address and
then go to the 80C32. As I recall most used a 74LS373 to
latch half addresses. The other half would be directly connected
to the 80C32.
Dwight
_________________________________________________________________
Climb to the top of the charts!?Play the word scramble challenge with star power.
http://club.live.com/star_shuffle.aspx?icid=starshuffle_wlmailtextlink_jan