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Sega/Gremlin 834-0069 Details

Description

Sub-logic board for Frogger. Mounted on top of the main PCB board.

Markings

834-0069

Memory Map:

Start   End R W Type Description
0 - 7FF r ROM IC32. (frogger.608)
800 - FFF r ROM IC33. (frogger.609)
1000 - 17FF r ROM IC34. (frogger.610)
4000 - 43FF r w RAM Tenative. IC30 low, IC31 high.

Board Components:

System Location Part Type Notes? Description
IC1 LM741 Chip
IC11 74LS74 Chip
IC12 74LS00 Chip
IC17 74LS90 Chip
IC18 74LS74 Chip
IC19 74LS74 Chip
IC2 M51516 Chip
IC20 74LS74 Chip
IC21 74LS32 Chip
IC22 CD4066 Chip
IC23 CD4066 Chip
IC24 CD4066 Chip
IC25 7404 Chip
IC3 7408 Chip
IC35 AY-3-8910 Chip
IC36 74LS32 Chip
IC37 74LS27 Chip
IC39 7404 Chip
IC40 8255 Chip
IC41 74LS00 Chip
IC5 74LS08 Chip
IC7 8255 Chip
IC8 74LS02 Chip
IC9 74LS27 Chip
Clock IC14 7404 Chip
Clock IC15 74LS93 Chip
Clock IC16 74LS93 Chip
Clock IC6 7493 Chip
CPU IC10 7408 Chip Acting as A buffer.
CPU IC13 74LS245 Chip Data buffer to CPU.
CPU IC26 Z80 Chip
CPU IC27 7408 Chip Acting as A buffer.
CPU IC28 7408 Chip Acting as A buffer.
CPU IC29 7408 Chip Acting as A buffer.
RAM IC30 2114 Chip Low nibble. NOTE: mislabeled on schematic as 2716!
RAM IC31 2114 Chip High nibble. NOTE: mislabeled on schematic as 2716!
ROM IC32 2716 Chip
ROM IC33 2716 Chip
ROM IC34 2716 Chip
ROM IC4 74LS42 Chip Chip select via AV11, 12, & 13 for ROM.

Games using this board:

Year Manuf. Name
1981 Sega/Gremlin Frogger


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