Skool Daze: Routine at AEE8

AEE8: Insert message text into the message graphic buffer

Used by the routine at B371. Generates the graphic data for the text of the message and inserts it into the buffer at 5B00. Returns with the message right-aligned in the buffer, and with C holding the number of empty pixel columns remaining on the left.

Input
C	0xFE
DE	Message address

AEE8

LD A,(DE)

A=ASCII code of a character in the message

AEE9

INC DE

Point DE at the next character in the message

AEEA

AND A

Have we reached the end of the message?

AEEB

RET Z

Return if so

AEEC

LD L,A

B=width (in pixels) of the bitmap for this font character

AEED

LD H,$D9

AEEF

LD B,(HL)

AEF0

INC H

Pick up a pixel column for the font character and slide it into the graphic buffer

AEF1

LD A,(HL)

AEF2

CALL $ADE8

AEF5

DEC C

Decrease the pixel column count

AEF6

DJNZ $AEF0

Jump back until the entire font character has been done

AEF8

XOR A

Insert a blank pixel column between characters

AEF9

DEC C

AEFA

CALL $ADE8

AEFD

JR $AEE8

Continue until the message is finished