Either designation should work for all current chips. For the 40X2, this lists the numbers:
sertxd(cr,lf)
for b1 = b.0 to b.7
sertxd(#b1," ")
next
sertxd(cr,lf)
for b1 = c.0 to c.7
sertxd(#b1," ")
next
sertxd(cr,lf)
for b1 = a.0 to a.7
sertxd(#b1," ")
next
sertxd(cr,lf)
for b1 = d.0 to...