[Aug/18/98]

Tugboat (Enter-Tech, Ltd.)

main board

  6821 6821

                u70 u69 u68 u67
  8912
            46505      u9 u8 u7

     10Mhz

piggy-back board


          46505
                   u167 u170 u169 u168    6502

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[Nov/11/2002]

Top board:
large chips
sy6502
hd46505rp

chip label	board  	chksum  rev
4716 u-168	170	14d8	r2
2532 u-169	169	9745	r2
4716 u-170	167	7078	r2
4716 u-167	168	19de	r2

Note some top board chips were labeled with a different location from the board.  Roms are named by board pos.  All roms had a hand written checksum on the label. Checksums matched and board was working.
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Bottom board:
supposedly a desert race board.  What appeared to be a cpu socket was a passthru to the top board.  4 other smaller chip sockets also passed thru to the top.
large chips
hd46505rp
hd46821p  Xtwo
ay-3-8912

2532 u7 3e28 r4
2532 u8 7308 r4
2532 u9 2978 r4


4716 u67 c1bb r2
2532 u68 69e1 r2
2532 u69 ab37 r2
2532 u70 b540 r2

DMW&MWB

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