a:xsub
;  Build ddtz
;
;  Assemble with Microsoft M80:
m80 =ddtz.z80/z
;  If you prefer SLR, use the following line instead:
;z80asm ddtz/M
;
;  Generate PRL file:
link ddtz[op]
;
;  Convert to COM file:
ddtz ddtz.prl
F ddtznew.com
W 200 H
G 0
;
;  If you don't have ddtz (yet), do it with ddt.
;  Adjust the end address, if file length changes:
;
;ddt ddtz.prl
;M200,28FF,100
;G0
;save 40 ddtznew.com