[Aug/06/97]

Silkworm 1988 Tecmo

CPU: Z80
Sound: YM3812

There's also a NEC D70008AC-8 CPU?

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[Aug/31/98]
------------------------
Silkworm by TECMO (1988)
------------------------

Location   Type     File ID    Checksum
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CPU B6     27256       R1        D712
CPU J3     27256       R2        84CF
CPU J5     27256       R3        B06F
CPU S5     27512       R4        ECBB
CPU S6     27512       R5        CD48
GFX C2     27512       R6        5F8A
GFX D2     27512       R7        2007
GFX E2     27512       R8        42BE
GFX F2     27512       R9        C545
GFX P1     27512       R10       B7D5
GFX P2     27512       R11       2DF3
GFX P2/3   27512       R12       583D
GFX P3     27512       R13       908C
GFX S1     27512       R14       A9C5
GFX S2     27512       R15       D3E6
GFX S2/3   27512       R16       C0BA
GFX S3     27512       R17       81D7


Note:  CPU - CPU PCB         (A-41909, 6217A)
       GFX - Graphics PCB    (B-41909, 6217B)

           - Custom CPU No. 5783 (626 batch)

             This version uses a custom sound processor on a 
             sub-board connected to CN5, located adjacent to the
             sound processor (Z80 CPU). The Z80 is (obviously)
             not installed on this version.

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[May/07/96]

        SILKWORM   CHIP PLACEMENT

MAY BE A CLONE BD

CHIP #  POSITION  TYPE
----------------------
A        4H       27256   CONN BD
B        6H       27256    "
C        P6       27512    "
D        P8        "       "
E        1C        "      BOTTOM BD
F        1D        "       "
G        1EF       "       "
H        1G        "       "
I        1N        "       "
J        1-        "       "
K        2N4       "       "
L        3N       27256    "
M        1R       27512    "
N        1-R       "       "
O        2R        "       "
P        3R       27256    "

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[MAME]

Silkworm

Memory map (preliminary)

0000-bfff ROM
c000-c1ff Background video RAM #2
c200-c3ff Background color RAM #2
c400-c5ff Background video RAM #1
c600-c7ff Background color RAM #1
c800-cbff Video RAM
cc00-cfff Color RAM
d000-dfff RAM
e000-e7ff Sprites
e800-efff Palette RAM, groups of 2 bytes, 4 bits per gun: xB RG
          e800-e9ff sprites
          ea00-ebff characters
          ec00-edff bg #1
          ee00-efff bg #2
f000-f7ff window for banked ROM

read:
f800      IN0 (heli) bit 0-3
f801      IN0 bit 4-7
f802      IN1 (jeep) bit 0-3
f803      IN1 bit 4-7
f806      DSWA bit 0-3
f807      DSWA bit 4-7
f808      DSWB bit 0-3
f809      DSWB bit 4-7
f80f      COIN

write:
f800-f801 bg #1 x scroll
f802      bg #1 y scroll
f803-f804 bg #2 x scroll
f805      bg #2 y scroll
f806      ????
f808      ROM bank selector
f809      ????
f80b      ????

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