From 17cd4fb4a836d4d24a2e9973617f6d5389079a85 Mon Sep 17 00:00:00 2001 From: Vas Crabb Date: Tue, 29 Dec 2015 15:53:42 +1100 Subject: [PATCH] notes (nw) --- src/mame/drivers/laserbat.cpp | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/src/mame/drivers/laserbat.cpp b/src/mame/drivers/laserbat.cpp index 589c94c39f4..f6b6d8c159e 100644 --- a/src/mame/drivers/laserbat.cpp +++ b/src/mame/drivers/laserbat.cpp @@ -9,9 +9,13 @@ The two games have identical game/video boards hardware, but completely different sound boards. Laser Battle/Lazarian have a dumb sound board with TMS organ and CSG chips driven directly by the - game program. Cat'N'Mouse - very different and they don't use the collision detection provided - by the s2636 chips. + game program. Cat and Mouse uses an intelligent sound board with + its own CPU that plays melodies on a pair of AY-3-8910 PSGs. + + The video hardware uses a PLA to mix TTL-generated background, + effect and sprite layers with the S2636 PVI outputs. The collision + detection and interrupt generation capabilities of the S2636 PVIs + are not used. Game board supports two different sound board interfaces: 16-bit unidirectional bus on J3 and 8-bit bidirectional bus on J7.