ref: 2718c36065e7eb201a149938bcdd51987c4e56b6
dir: /engine/overworld/clear_variables.asm/
ClearVariablesOnEnterMap:: ld a, SCREEN_HEIGHT_PIXELS ld [hWY], a ld [rWY], a xor a ld [hAutoBGTransferEnabled], a ld [wStepCounter], a ld [wLoneAttackNo], a ld [hJoyPressed], a ld [hJoyReleased], a ld [hJoyHeld], a ld [wActionResultOrTookBattleTurn], a ld [wUnusedD5A3], a ld hl, wCardKeyDoorY ld [hli], a ld [hl], a ld hl, wWhichTrade ld bc, wStandingOnWarpPadOrHole - wWhichTrade call FillMemory ret