Divisible

Author: issalig
Category: Christmas Challenge
System:   Amstrad CPC
Language: Z80 assembly
Len source code: 
Len exe file:    85
Len code only:   85
Instructions:
Install RetroVirtualMachine or WinAPE
Insert disk vc3.dsk
Then in BASIC type: 
MEMORY &8000
LOAD "vc3.bin", &8000
CALL &8000
Description:
It draws a gift box. It uses a function to get the character from a set
of 4 "+-! ". a=2*(row divby 9) + (col divby 9)
Comments:
I tried to make it small but readable. Enjoy it!