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RAM DISK EMULATION 5.9
First, boot the other disk you would like to run using the
Control+[Open—Apple]+Reset key combination. DO NOT turn off the Apple and then
turn it on again to boot the desired disk aa all files on the RAM disk will be
lost. Run the desired programs from the disk you booted.
Second, when you are ready to return to use the ProDOS RAM disk, remove the disk
you have been working with from your disk drive. Insert a ProDOS disk,
preferably one with the file MULTIDRIVE.RAM on it. Press the
Control+[Open—Apple]+Reset key combination to exit the program you have been
working with and boot the ProDOS disk. If you were using a ProDOS program, DO
NOT use that program’s “Quit” routine instead of the Control+[Open~Apple]+Reset
key combination; using the ProDOS ‘Quit” routine will destroy the RAM disk
files.
Third, run the MULTIDRIVE.PRO program. This will restore the ProDOS RAM disk and
all files on it will reappear as you last left them.
Programming Tips
The ProDOS RAM disk can be used like a normal disk from within Applesoft
programs. All Applesoft disk related commands function correctly and no special
steps are required to use “IRAN.”
From within assembly language programs, you may directly manipulate files on the
“IRAN” disk using a ProDOS MLI (Machine Language Interface) callable subroutine
in the ProDOS Kernal or by passing commands using the Basic Interpreter’s
command handler. Avoid using direct calls to the device driver for block access
as unpredictable results may sometimes occur.
ProDOS Updates
The ProDOS RAM disk program may be modified in the future. Allowing the ProDOS
generated “/RAM” file to co—exist with the MultiRam C’s RAM disk is now planned.
Registered owners will be notified of updated software.
OTHER RAM DISK SOFTWARE
Apple Pascal RAM disk emulation software will soon be available at a nominal
charge. Contact your dealer for more information if you are interested in a
Pascal RAM disk emulator.