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NEC TG-16/TE/TurboDuo => TG/PCE Repair/Mod Discussion => Topic started by: Charles MacDonald on June 08, 2013, 05:33:13 PM
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If somebody has the time and inclination, I need to get something checked inside the PC-FX.
On one of the two PCBs is a NEC uPD78C14 chip, near the center. It is a 64-pin rectangular QFP. Here's a link to the chip pin assignment:
http://imgur.com/Q2u8Kue
Going counter-clockwise from the pin 1 indicator, I need to know how pins 21 (MODE1) and 23 (MODE0) are connected. One is probably connected to a nearby resistor or resistor array which may in turn be connected to +5V or ground. The other pin is probably directly connected to +5V or ground.
Also if you could let me know what all of the lines of text on the 78C14 chip are in their entirety that would help a lot.
Thanks!