Routines
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CB63: Move a line of a message upwards
Used by the routine at CB15.
CB63 PUSH AF Store all registers.
CB64 PUSH BC
CB65 PUSH DE
CB66 PUSH HL
CB67 PUSH IX
CB69 LD IX,$EB5E Point IX at the bottom of the screen (using the offset from EA60).
CB6D LD B,$7F Number of characters to scroll.
CB6F NOP
CB70 HALT Wait for interrupts, to stop flicker.
CB71 PUSH BC Preserve BC.
CB72 LD H,(IX+$01) Copy from the first line.
CB75 LD L,(IX+$00)
CB78 LD D,(IX+$03) Copy to the second line.
CB7B LD E,(IX+$02)
CB7E LD BC,$0020 Copy one line.
CB81 LDIR Do the copy.
CB83 POP BC Restore IX.
CB84 DEC IX Move up a line.
CB86 DEC IX
CB88 DJNZ $CB71 Loop back until all lines are scrolled.
CB8A POP IX Restore all registers and return.
CB8C POP HL
CB8D POP DE
CB8E POP BC
CB8F POP AF
CB90 RET
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