Hi,

  KA630-A.V1.3, 8/16MB Memory, RDQX3: RD54, RX50, DEQNA, TQK50: TK50
  Console Terminal: DEC-VT220

All I can suggest is try different terminal setups or a different console
terminal (I use an old vt100 set up as 8bit no parity). I suspect that
the parity bit is getting set on some of the characters and confusing the
console code. However, it seems weird that the console commands like
"b/3 mua0" work, since they screw up on my uvaxII if the terminal isn't
set to no parity.

If you get it to work, let us know what the trick is, rick