Skool Daze: Routine at 45937

45937: Prepare a message in the message graphic buffer (2)

Continues from 45682. Generates the graphic data for the text of the message and centres it in the buffer at 23296.

Input
C	254
DE	Message address

45937

CALL 44776

Slide the message text into the graphic buffer

45940

SRL C

Halve the number of remaining pixel columns and add one

45942

INC C

45943

XOR A

Insert this number of blank pixel columns, thus centring the message

45944

CALL 44520

45947

DEC C

45948

JR NZ,45943

45950

RET