From 431e518d204fa1fb5d53a804faef42a180e768ae Mon Sep 17 00:00:00 2001 From: David Haywood Date: Mon, 5 Oct 2015 13:00:37 +0100 Subject: [PATCH] revise notes (nw) --- src/mame/drivers/m72.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/src/mame/drivers/m72.c b/src/mame/drivers/m72.c index ce98df82d18..5d827c6cb45 100644 --- a/src/mame/drivers/m72.c +++ b/src/mame/drivers/m72.c @@ -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?)