battlezone

i have an uptight battlezone.
there is no sound. in fact the c012294 is cold. also the four transistor arrays are burning hot.

anyway, there are four address lines where the waveforms are not like the rest. three of the lines go to the address decoder. all the usual stuff seems to check out(voltages, traces, board interconnect, etc).
yes, the dog won't shut up. wdclr never goes low. two of the address lines run the wdclr. a6, a10, a11, a13 aren't like the rest. the rest are square waves, but the four are basically a line at ground potential with faint whispy multiple lines at the top. after the reset there is a square wave for a fraction of a second then it is as i just described. i replaced all the proms on the main board.
so i can follow your train of thought and learn, why do you suspect the ram and how do i tell
which ones are for 000-7fff?

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Received on Fri Dec 10 19:06:35 2004