Commodore 128 System Manual page 314

SCRATCH
Delete a file from the disk directory
SCRATCH "filename" [,Ddrive number] [CON | ,>Udevice
number]
This command deletes a file from the disk directory. As a
precaution, the system asks " Are you sure," (in direct mode only)
before the Commodore 128 starts the operation. Type a Y to
perform the SCRATCH or press any other key to cancel the
operation. Use this command to erase unwanted files, and to
create more space on the disk. The filename may contain
template, or wildcards (?,*). The default drive number is 0 and
default device number is 8.
EXAMPLE:
SCRATCH "MY BACK", DO
This erases the file MY BACK from the disk in drive 0 of unit 8.
SLEEP
Delay program for a specific period of time
SLEEP N
where N is seconds 0 < n < 65535
If you select a delay which is too long for your program and you
want to halt it, the STOP key can be used to break into a delay.
SLOW
Return the Commodore 128 to 1 Mhz operation
SLOW
The Commodore 128 is capable of running the 8502
microprocessor at a speed of 1 or 2 megahertz (Mhz).
The SLOW command slows down the microprocessor to 1
Megahertz from 2 Megahertz. The FAST command sets the
Commodore at 2 Mhz. The Commodore 128 can process
commands substantially faster operating at 2 Mhz than at 1 Mhz.
Note, however, that the 40 column screen cannot be used at
2Mhz.
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