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LSP_1ST ($C004C8): Clear sprites
Warning:
- Register contents aren't preserved ! (Uses D0, D1, and A0)
- VRAM address is modified
This system ROM call performs the following operations:
- All shrinking values are set to max (all SCB2 is set to $0FFF)
- All sprite heights are set to 0 and Y positions set to 496 (all SCB3 is set to $0000)
- All sprite X positions are set to 380 (all SCB4 is set to $BE00)
- The map of sprite #0 is set to tiles # $FF (SCB1 $0000~$0040 to $00FF,$0000)