Commodore 128 - Disk Command Format

DISK COMMAND FORMAT
Optional parameters in disk commands are shown thus:
[,parameter]
The comma is not required if the parameter is the first after the
command itself. If other parameters which require commas are
omitted the commas should be ommitted too.
EXAMPLE:
DIRECTORY [Ddrive][<ON | ,>Udevice number][,wild card]
would in full produce:
DIRECTORY DO ON U8,”AB*”
To specify only the wild card, no comma is required, i.e.
DIRECTORY “AB*”
Whenever variables are used in disk commands they MUST be
enclosed in parentheses (). FOR EXAMPLE:
DIRECTORY D(DV),(A$)
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