Component side Solder side     Component side Solder side

The first revision for the PAL model 1. It is very similar to its NTSC counterpart, but has a clock divider circuit based around a 53.204 MHz crystal and discrete components. This clock divider is normally hidden underneath a small RF shield which is soldered to the board.

Most of these boards have the v1.3 BIOS, but a few have the v2.0 BIOS, which does not perform a header check.

Board Number
171-5385
CPU
NEC D780C-1 or Zilog Z0840004PSC
I/O Controller
Sega 315-5216
RAM
NEC D4168C-15 or NEC D4168C-20
VDP
Sega 315-5124
VRAM
2 x NEC D4168C-15
Video Encoder
Sony V7040
BIOS
Sony CXK3864
Known Production Dates
September 1986 to September 1987

Photos by Paul Baker, Mark Knibbs


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