Many second-hand lathes come with Macro B disabled. Check . If zero, set it to 1, and suddenly you can use #100 = #101 + 1 and WHILE [#1 LT 10] DO1 .
The Silent Architecture: An Essay on the Fanuc 0-T 900 Series Parameters fanuc ot 900 parameter list
The Fanuc OT 900 parameter list is extensive, with over 1,000 parameters. Here are some key categories and descriptions: Many second-hand lathes come with Macro B disabled