RGB Master System II: IC BD M4Jr. VA1 837-7275

Shown above is a French RGB Master System II, which was introduced in 1991. It uses the same board revision and clock crystal as the NTSC Master System II. The only differences are that the CXA1145 video encoder has been removed and the RF modulator has been swapped out with the 8-pin DIN connector seen on the model 1. Like the French model 1, it only outputs unamplified RGB and requires the "Adapteur R.V.B." cable for connection to a display. Contrary to other (non-RGB) PAL Master System II boards, this board has a 315-5216 I/O controller.

Also, jumper JP1 (VDP video frequency select) is set differently than the NTSC model. This particular example has a region switch installed though it was originally set to 50 Hz. Note that even though this model runs at 50 Hz, it will actually run slightly faster than other PAL models which use a 53.203424 MHz oscillator (divided by five to produce the VDP clock).

Board Number

171-5926-A

Manufacture Date

20 JUL 1992

Clock crystal frequency

10.7386 MHz

CPU

Zilog Z0840004PSC Z80

I/O Controller

Sega 315-5216

Main RAM

Sanyo LC3664AL-10

VDP

Sega 315-5246

VRAM

2 x NEC D4168C-15-SG

Video Encoder

None

BIOS

Sega MPR-12808 (US/European BIOS with Alex Kidd in Miracle World)

Photos by Eke

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