RE: Zektor for the masses

>
>>Great! So tell me, what needs to be done to the CPU board? Special CPU
>>EPROM
>>for each game, or generic? What about the security chip socket, what goes
>>in
>>there now?

The CPU EPROMs for each game remain unchanged. There's nothing really
special about them, each one is just the first of n EPROMs. It's
contents
is located at 0x0000 and extends to 0x07FF. To run the 'SC-free'
version,
the security chip is removed and the eight address lines to the chip (A7
- A0)
are connected to the eight output lines (MA7 - MA0). You can either do
this
permenantly by soldering wires or temporarily by making up a DIP shunt.
My first choice is the shunt. The new patched EPROMs are installed and
away you go.

DIP Shunt 'from-to' List for location U21 (40 pin)
pin 34 to pin 40,
pin 32 to pin 39,
pin 33 to pin 38,
pin 29 to pin 37,
pin 30 to pin 36,
pin 31 to pin 35,
pin 27 to pin 28,
>pin 20 to pin 21.

Dave
Received on Wed May 21 11:22:07 1997