X-mas drawing through repetition

Author: Pararaum / The 7th Division
Category: Christmas Challenge
System:   Amstrad CPC
Language: Assembler
Len source code: 718
Len exe file:    248
Len code only:   120
Instructions:
run"xmas.bin in an Amstrad CPC emulator

Description:
This code just repeatedly prints one unit (one diamond square) and
repeats the line of the diamond squares three times.