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-rw-r--r--src/mame/drivers/pgm2.cpp19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/mame/drivers/pgm2.cpp b/src/mame/drivers/pgm2.cpp
index 785b6953a2c..2d4756ce59e 100644
--- a/src/mame/drivers/pgm2.cpp
+++ b/src/mame/drivers/pgm2.cpp
@@ -68,6 +68,25 @@
Oriental Legend 2 (Oversea) - V21
Oriental Legend 2 (China) - A8
+ GPU registers, located at 301200xx, 16bit access.
+ 00 - bg scroll x
+ 02 - bg scroll y
+ 04 - zoom something, 0F-7F, default 1F
+ 06 - zoom something, 0F-7F, default 1F
+ 08 - fg? scroll x
+ 0a - fg? scroll y
+ 0e - sprite related, set to 1 at sprite hw init
+ 10 - sprite related, orleg2 - 0x13, kov2nl - 0x14
+ 14 - sprite enable ? set to 0 before spriteram update, to 1 after
+ 16 - enable access to vrams/palettes/etc ? (bitmask)
+ 18 - vblank ack
+ 1a - ? 0 at init
+ 1c - sprite related, orleg2 - 5, kov2nl - 7
+ 1e - sprite related, set to 2 at sprite hw init
+ 32 - shared RAM bank
+ 34, 36 - sprite related, set to 0 at sprite hw init, some unused xor feature ?
+ 38, 3a - sprite mask xor key
+
*/
#include "includes/pgm2.h"