as: PDP-11-Syntax
9.33.3 PDP-11 Assembly Language Syntax
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'as' supports both DEC syntax and BSD syntax. The only difference is
that in DEC syntax, a '#' character is used to denote an immediate
constants, while in BSD syntax the character for this purpose is '$'.
general-purpose registers are named 'r0' through 'r7'. Mnemonic
alternatives for 'r6' and 'r7' are 'sp' and 'pc', respectively.
Floating-point registers are named 'ac0' through 'ac3', or
alternatively 'fr0' through 'fr3'.
Comments are started with a '#' or a '/' character, and extend to the
end of the line. (FIXME: clash with immediates?)
Multiple statements on the same line can be separated by the ';'
character.
Info Catalog
as: PDP-11-Pseudos
as: PDP-11-Dependent
as: PDP-11-Mnemonics