Used by the routines at 27406 (to print the Skool Daze logo and the score box), 30464 (to print a lines bubble), 31040 (to print the lesson box) and 63829 (to print a safe combination letter in a bubble).
Input
DE
Attribute file address
HL
Graphic buffer address
29977
PUSH DE
Save the attribute file address
29978
LD BC,8
Copy the first row of attribute bytes from the graphic buffer to the screen
29981
LDIR
29983
LD C,24
Copy the second row of attribute bytes from the graphic buffer to the screen
29985
EX DE,HL
29986
ADD HL,BC
29987
EX DE,HL
29988
LD C,8
29990
LDIR
29992
LD C,24
Copy the third row of attribute bytes from the graphic buffer to the screen
29994
EX DE,HL
29995
ADD HL,BC
29996
EX DE,HL
29997
LD C,8
29999
LDIR
The attribute bytes have been copied to the screen. Now for the graphic bytes. This entry point is used by the routine at 30156.
30001
POP DE
Restore the attribute file address to DE
30002
LD A,D
Set DE to the corresponding display file address
30003
SUB 80
30005
ADD A,A
30006
ADD A,A
30007
ADD A,A
30008
LD D,A
30009
LD C,3
There are three rows of UDGs to copy to the screen
30011
LD A,8
There are 8 pixel lines per row of UDGs
30013
PUSH BC
Save C (the row counter)
30014
PUSH DE
Copy a row of 8 UDGs from the graphic buffer to the screen
30015
LD C,8
30017
LDIR
30019
POP DE
30020
INC D
30021
DEC A
30022
JR NZ,30014
30024
LD A,E
Set DE to the display file address for the next row
30025
ADD A,32
30027
LD E,A
30028
JR C,30034
30030
LD A,D
30031
SUB 8
30033
LD D,A
30034
POP BC
Restore the row counter to C
30035
DEC C
Next row
30036
JR NZ,30011
Jump back until all three rows of UDGs have been copied
