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Thursday, October 24, 2013

This old arcade console

Got an old arcade console in the other day. Totally dead, found a bad switching power supply. Believe it or not power consumption to the CPU board is very small at about 25 watts, surprising considering all the logic is discreet 74XX series. This was a donkey con knock off. Here are some pics

 Replacement SMPS, notice the isolation transformer in the center, 
the original was totally burnt up with heat damage.

Console Front

Inside cabinet, in fact one of the RAM IC was decapped and still working

 Close up of CPU board, two large MSI chips one for sound and one main CPU, tons of ROMS and standard 74XX series logic

November 1981