I got some rare NOS TurboGrafx in 50Hz PAL Version.
What can we do with this kind of PC-Engine
a) Speedup and change it to 60Hz
-Exchange Osscilator X201 to 21.47727Mhz
-cut Pcz80 Pin 15
-Solder wire from Pad pin 15 to Pin 22
b) RGB bypass for best picture
I took the RGB Signal from C154 to C156 after removing the Kerkos. The wires leads directly to the Hu6260 RGB-Out
using the rgbbypass PCB
yellow wire to desoldered PIN 44 from HU6260 (C-SYNC)
I am using an old „french“ pinput from the 90’th. So I have to reroute some cirquits
Desolder Din and cut GND on Partsside for make standard french Version of Din8 Cable working.
Cut 5 Din Via circuits and wire as shown here
red audio 2 (right), white Audio 6 left, grey 5V
yellow desoldered Pin 44 from Hudson 6260 CSYNC
c) Jailbarfix
exchange C137 and C133 to 4,7uf/16V
d) jap/eng switch
you need to switch 8 wires (15,16,17,19,20,21,22,23). I done it with two analog switches MC14551BCP
