I had a weird thing happen today. I tried to nickname an address "R01", but DMD refused and gave me an error about the name not being allowed. OK, so I'm thinking maybe it's too close to R0 or R1 and will confuse either the BRX or DMD, OK. So then I tried "Ry01" but got the same error. Can't imagine why DMD and BRX wouldn't allow that. Anyone know?