Kategorie: RGB Bypass

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