[Apr/19/97]

Seicross 1984 Nichibutsu

CPU: Z80
Sound: AY-3-8910

Roms 1-7 are 2732's
Rom 8 is 2716
Rom 9 looked like a masked ROM, but may have been something completely different.
Roms A-D are 2732's

The boardset looks like a take-off of Crazy Climber, but it's not identical.
SMC1             
SMC2             
SMC3             
SMC4             
SMC5             
SMC6             
SMC7             
SMC8    TURNS OUT THAT ROM(9) ON MY BOARD IS A 2K RAM AND ROM 8 IS A 2732
SMC8             
SMC9             
SMCA             
SMCB             
SMCC             
SMCD             

THIS SET IS AN ORIGINAL NICHIBUTSU BOARD
USES Z80 CPU W/AY-3-8910 SOUND
NAME   LOCATION ALL ARE 2732
--------------
SZ1      3A     CONN BD
SZ2      3C      "
SZ3      3D      "
SZ4      3E      "
SZ5      3FG     "
SZ6      3H      "
SZ7      3I      "
SZ8      3J      "
SZ9      7H     REAR BD
SZ10     7J      "
SZ11     7K      "
SZ12     7M      "
82S123   10B     "
82S123   10C     "
PAL16H2  3B      "

-


[MAME]

Seicross

Memory map (preliminary)


0000-77ff ROM
7800-7fff RAM
9000-93ff videoram
9c00-9fff colorram

Read:
A000      Joystick + Players start button
A800      player #2 controls + coin + ?
B000      test switches
B800      watchdog reset

Write:
8820-887f Sprite ram
9800-981f Scroll control
9880-989f ? (always 0?)

I/O ports:
0         8910 control
1         8910 write
4         8910 read


There is a microcontroller on the board. Nichibutsu custom part marked
NSC81050-102  8127 E37 and labeled No. 00363.  It's a 40-pin IC at location 4F
on the (Seicross-) board. Looks like it is linked to the dips (and those are
on a very small daughterboard).

-

