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.
The good news is that I can lay my hands on a board I manufactured and
read back the equations from that.
Unfortunately the earliest I can do that is next week.
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.
Cheers
Malcolm
On 21/02/2011 14:03, Phill Harvey-Smith wrote:
Malcolm Lear wrote:
Hi Phill,
I produced a couple of Trump card clones in the 80's and still have
the PCB designs at hand, so drawing up a schematic will not be
difficult.
Excellent :)
If you can mail me the PLD dumps
I'll label and comment the equations for you. I did this myself, but
cannot locate the files any more.
Sure, (I'll send them off list, not sure what atachement policy is for
this list) I'm not that sure how accurate they are, my device reader
only knows about TI 16L8s, whereas the ones on my TC are national
semi. When I ran them through jed2eqn I ended up with things like
output = i1 & !i1 # vcc
Which didn't seem very helpful :( :(
Cheers.
Phill.
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