Routines
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9200: Routine at 9200
Used by the routines at Demo_Mode and Start_1UP_Game.
9200 LD ($5F00),A Write A to Background_Reference.
9203 CALL Change_Background Call Change_Background.
9206 LD A,$48 Call Screen_Calc using 48. On return HL=4820.
9208 CALL Screen_Calc
920B LD B,$40 Set a counter of 40.
920D LD DE,$8000 DE=Shadow_Buffer.
9210 PUSH HL Push HL onto the stack.
9211 PUSH DE Push DE onto the stack.
This entry point is used by the routine at B2FB.
9212 PUSH BC Push BC onto the stack.
9213 LD BC,$0020 Copy 20 bytes of data from HL to DE.
9216 LDIR
9218 POP BC Restore BC, DE and HL from the stack.
9219 POP DE
921A POP HL
921B CALL $9229 Call 9229.
921E PUSH BC Stash the counter on the stack.
921F LD BC,$0020 BC=0020.
9222 EX DE,HL DE+=BC.
9223 ADD HL,BC
9224 EX DE,HL
9225 POP BC Restore the counter from the stack.
9226 DJNZ $9210 Decrease counter by one and loop back to 9210 until counter is zero.
9228 RET Return.
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