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-rw-r--r--constants/hardware_constants.asm3
1 files changed, 3 insertions, 0 deletions
diff --git a/constants/hardware_constants.asm b/constants/hardware_constants.asm
index e875622d..f9e3fe19 100644
--- a/constants/hardware_constants.asm
+++ b/constants/hardware_constants.asm
@@ -30,6 +30,9 @@ OAM_X_FLIP EQU 5
OAM_Y_FLIP EQU 6
OAM_PRIORITY EQU 7 ; 0: OBJ above BG, 1: OBJ behind BG (colors 1-3)
+; serial
+START_TRANSFER_EXTERNAL_CLOCK EQU $80
+START_TRANSFER_INTERNAL_CLOCK EQU $81
; Hardware registers
rJOYP EQU $ff00 ; Joypad (R/W)