The immediate character is `$' for Unix compatibility, not `#' as DEC writes it.
The indirect character is `*' for Unix compatibility, not `@' as DEC writes it.
The displacement sizing character is ``' (an accent grave) for
Unix compatibility, not `^' as DEC writes it. The letter
preceding ``' may have either case. `G' is not
understood, but all other letters (b i l s w) are understood.
Register names understood are r0 r1 r2 ... r15 ap fp sp
pc. Upper and lower case letters are equivalent.
For instance
tstb *w`$4(r5)
Any expression is permitted in an operand. Operands are comma separated.
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