I dont use Basic in any form (Bascom or otherwise) but this should be okay
If I were you I'd download a Demo C compiler. Learning C will open doors for you.

xby is a xram command similar to poke (ie stuff a location with a value)
Pho mean print hex without formatting

so (ignoring Xram)

Dim x,y,z, as byte

do
x = 0
y = 1
z = 2
printhex x
printhex y
printhex z
loop