John, Don't forget that the Midway DRAM is part of the video hardware. The thoughts were a PCB that sat on top of and connected through to either all 16 DRAM sites or one that connected through to two DRAM sites (one from each bank) with flyleads to the other sites to pick up the remaining data bus bits. The latter is a smaller PCB but messier. It has been checked and it appears that both Taito and Midway convenienly used the same spacing for the DRAM layout. You need a 6264, maybe with a buffer, and a little bit of analogue stuff with a PAL to sort out the 12V chip enables. Regards, Paul. John Robertson wrote:
I was figuring with the speed of static RAM these days that my generic Z80 RAM/ROM board will do the job. I'll let you guys know in the next few days the results.
It works just fine replacing the RAM/ROM on a Game Plan MPU, cuts my service time way down on the corroded boards.
John :-#)#
At 01:50 PM 12/07/2002 -0700, Paul Swan wrote: