XYBOTS (Atari, 1987)
--------------------

Filenames of the form "xxxx.yyy" stand for part
number "136054-xxxx", located at "yyy" on the PCB.


S.A. Audio board: [is there one?]

CHIP / POSITION  CHECKSUM
---------------  --------
136054-????.??     ????


Main board:

Xybots is a single multilayer board, fairly small (about 9 1/2" x 11"),
and appears to be of roughly the same vintage as Blasteroids.  CPU is
a 68000P8, crystal is 14.31818 MHz, and TTL is very densely packed. 
A row of male .100" MTA connectors goes across the top of the board,
and power is supplied through a 15-pin Molex/AMP-style connector.

On the edge of the board (in the middle mask) is inscribed 
"+5V 044424-01 REV B", presumably the part number of the bare 
PCB.  A shamrock sits on the solder side of the board; perhaps
the board was fabricated in Ireland?


CHIP / POSITION  TYPE   CHECKSUM
---------------  -----  --------
136054-1101.c4   2764   9164 (alone)

136054-1105.de1  27512  3d19 (horizontal row of 7 (8?) ROMs)
136054-1106.e1   27512  da69
136054-1107.f1   27512  6edc
136054-1108.fj1  27512  47b5
136054-1109.j1   27512  15aa
136054-1110.k1   27512  bdfb
136054-1111.kl1  27512  9886
136054-1112.lm1  27---  ---- (empty socket)

136054-2117.l7   27512  6547 (vertical row of 3 (4?) ROMs)
136054-211-.l9   27---  ---- (empty socket)
136054-2103.l11  27512  ff76
136054-2102.l13  27256  d6fe

136054-2112.c17  27512  9ede (cluster of 4 ROMs near 68000P8 CPU)
136054-2113.c19  27512  9ede
136054-2114.b17  27256  13ff
136054-2115.b19  27256  66df


Custom parts:

137412-107 at B14 (SLAPSTIC)
137526-001 at D/E20
137418-103 at D/E/F11
137419-101 at J/K/L14
137536-001 at F/J/K7 and F/J/K9 (40-pin MB87316; I think this is a 16-bit PROM)

Hackers can browse the ASCII stashes in ROMs 2112, 2113, 2114, and 2115.