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Title: Nichibutsu Games Post by: channelmaniac on February 13, 2012, 01:25:27 PM Model: Moon Alien Part 2
Symptom: Graphic corruption Starfield was missing and backgrounds were solid color bars. Explosions were missing colors. Signal /LSD0 was missing on IC 3L. Replaced bad 74194 at location 2K as it's output was missing. Starfield returned and colored bars went away. Replaced incorrect chip installed as motion RAM with the correct replacement IC to fix blank explosions. Recapped audio section. Game played but the colors were wrong. Replaced an incorrect color PROM at 6L and tested. NOTE: This board uses 74S301 bipolar RAMs. An Intel 3107 is a direct replacement for these. |