When I was making mine, I put a frequency counter
on A12. I know its not the most accurate, but it
registered around 1MHz. Which was enough for me
to figure out the the microcontroller I was using
couldnt possibly get the job done. I would
recommend using the Xilix XC9500 CLPDs. They are
easy to use, the software is free. I dont know
Verilog or VHDL, I use the schematics editor.
I had never used anything like a CLPD before this,
and if I can figure it out, anyone can.
Check out http://www.al-williams.com/pbx84.htm.
They have a nice tutorial and I ended up buying
their board and programmer.
Good Luck, its not too hard.
PS An early tip, long wires off VCS, very bad.
My last concern is timing. How long do I have to get valid data on
the bus once the 2600 has set up the address lines?
The FAQ lists the bus speed as 1.19 MHz. Does that mean I have
less than 840 nS to get the data lines valid?
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