Routines
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B74A: Print a high 7 bit terminated string
Used by the routines at AA65, B140 and B7B8.
Input
HL The screen address to print
DE Pointer to the string
B74A LD A,(DE) Get first character
B74B INC DE Increment string pointer ready for next one
B74C BIT 7,A Is bit 7 set?
B74E JR Z,$B747 If not, print and carry on
B750 AND $7F Strip off the extra bit
B752 JP $B72D Print this character then exit
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