Hi I used in a A4 and works good, the &110 is the orientation 16.67 is condensade (I'm not speak english, sorry)
I thing the 8.5 can change to A3
SET PRINT ON
SET DEVICE TO PRINT
SET MARGIN TO 10
A = CHR(27)+'&l1O'+CHR(27)+'10U'+CHR(27)+'(s0p16.67h8.5v0s0b0T'
?A
.....
.......
restore to default mode
A = CHR(27)+'&l0O'+CHR(27)+'10U'+CHR(27)+'(s0p10.00h8.5v0s0b0T'
? A
SET DEVICE TO SCREEN
SET PRINT OFF
saludos
Mnauel