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6E00: Print a message
Used by the routines at 6E1A and 6EC5.
Input
DE Display file address
HL Message address
6E00 LD A,(HL) Pick up the ASCII code of the next character to print
6E01 ADD A,A Have we reached the end of the message?
6E02 RET Z Return if so
6E03 NOP
6E04 NOP
6E05 INC HL Point HL at the next character in the message
6E06 PUSH HL Save this pointer for now
6E07 PUSH DE Save the display file address
6E08 LD H,$0F Point HL at the base address of the graphic data for the font character (in the ROM)
6E0A LD L,A
6E0B ADD HL,HL
6E0C ADD HL,HL
6E0D LD B,$08 Print the character on the screen
6E0F LD A,(HL)
6E10 LD (DE),A
6E11 INC L
6E12 INC D
6E13 DJNZ $6E0F
6E15 POP DE Restore the display file address to DE
6E16 POP HL Restore the pointer to the next character in the message
6E17 INC E Point DE at the next display file location
6E18 JR $6E00 Jump back to print the next character
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