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revise notes (nw)

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David Haywood 2015-10-05 13:00:37 +01:00
parent be0d16df94
commit 431e518d20
1 changed files with 11 additions and 1 deletions
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12
src/mame/drivers/m72.c
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@ -9,12 +9,22 @@ protection information by Nao
board differences
M72 - this is the original hardware, supports an MCU
M72 - 3 board stack, 2 known variants
M72-B-D (bottom) / M72-A-C (middle) / M72-ROM-C (top)
This is the original hardware used by R-type
Z80 program uploaded to RAM rather than having a ROM
each of the 2 tile layers uses it's own set of ROMs.
Flip bits are with the tile num, so 0x3fff max tiles
per layer
M72-B-D (bottom) / M72-A-C (middle) / M72-C-A (top)
This is used by all other M72 games, adds support
for an I8751 MCU and sample playback
M81 - revised hardware, Z80 uses a ROM, no MCU, same video
system as M72 (some layer offsets - why?)