Dos Support Program - Commodore 1541 User Manual

VERIFY
The VERIFY command works to check the program currently in memory against
the program on disk. You must include a device# with the VERIFY command. The
computer does a byte-by-byte comparison of the program, including line links —
which may be different for different memory configurations. For instance, if a pro
gram was SAVEd to disk from a 5K VIC 20, and re-LOADed on an 8K machine, it
wouldn't VERIFY properly because the links point to different memory locations.
FORMAT FOR VERIFY COMMAND:
VERIFY namcS, device*
DOS SUPPORT PROGRAM
On your demonstration disk, there may be a program called DOS SUPPORT.
This program, also called a wedge, allows you to use many disk commands more easily
(different wedges are used for the VIC 20 and the Commodore 64). Just LOAD the
program and RUN it. It automatically sets itseif up and erases itself when it's finished.
You'll have a few hundred less bytes to work with when this program is running, but
you'll also have a handy way to send the disk commands.
As a result of the DOS Support, the "/" key now takes the place of the LOAD
command. Just hit the slash followed by the program name, and the program is
LOADed. When you use this method, you don't need to use the LOAD command or
the comma 8.
The "@" and " > " keys are used to send commands to the disk drive. If you
type @$ (or > $), the directory- of the disk is displayed on the screen, without
LOADing into your memory! These keys also take the place of the PRINTS (see
chapter 4) to send commands listed in the next chapter.
To read the error channel of the disk (when the red error light is blinking), just hit
either the <£ or the > and hit RETURN Key. Trie complete error message is dis
played to you: message number, text, and track and block numbers.
13