Routines
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08B0: clear_screen: Clear display bitmap and attributes.
Used by the routines at clear_page_buffer, save_routine and warm_start_routine.
clear_screen 08B0 PUSH BC Preserve registers.
08B1 PUSH DE
08B2 PUSH HL
08B3 LD HL,$4000 Clear bitmap and attributes to zero.
08B6 LD DE,$4001
08B9 LD BC,$1AFF
08BC LD (HL),$00
08BE LDIR
08C0 POP HL Restore registers and return.
08C1 POP DE
08C2 POP BC
08C3 RET
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