Got vertical lines on your SEGA Master System? Here's a fix for that!

WORK IN PROGRESS!!!! This is not fully working yet!!!

The SEGA Master System console in this particular revision (M4) is plagued with vertical stripes in video-output called 'jailbars' caused by interferences from the clock-line.

Install: Remove the V7040 RGB-Encoder IC. Install a SONY CXA1145P on my pcb. Cut the red, green, blue and csync connections from the VDP (315-5124) and wire the signals directly to my pcb. You can use pin-headers to install this pcb onto the mainboard where the V7040 was located.


C1, C2, C3 = 0.1uF (104Z/16V)

R1, R2, R3 = 2K2 Ohms

R4, R5, R6 = 3K3 Ohms