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RAM DISK EMULATION 5.1
Chapter 5
RAM DISK EMULATION
The MultiRam C Card can be made to look like a high capacity disk drive to DOS
3.3, ProDOS, and Apple Pascal operating systems.
After MultiRam C is setup as a RAM disk, it can be used like any disk drive
except it will work many times faster since it is RAM based and has no
mechanical parts. Depending upon the type of operating system and commands
used, disk access times can be forty times faster than normal.
To transfer a program to a RAM disk, the program must be available on disk as an
unprotected file, a file that can be cataloged using a normal, unmodified
operating system. Most copy protected programs cannot be transferred to a
MultiRam C RAM disk although some may be able to use the RAM disk as a fast data
disk.
DOS 3.3 RAM DISK
The MTULTIDRIVE.DOS program converts your MultiRam C Card’s memory and the 64K
auxiliary memory of the //c into fast electronic disk drives for the DOS 3.3
operating system. The DOS RAil disk drive is used as up to two slot 3 disk
drives.
Specifications
MultiRam C memory and the 64K auxiliary bank of the //c is allocated by the RAM
disk program to provide up to two large capacity disk drives with MultiRam C’s
full 512K of memory. With a 256K standard RAM configuration, the RAM disk
program creates one 320K RAM disk (256K MultiRam memory + 64K //c auxiliary
memory = 320K). With 256K in Bank A, 64K in Bank B, and 64K auxiliary memory on
the //c, one 384K RAM disk is created. With a 512K MultiRam C, one full 384K
RAM disk and one partial 192K RAM disk are crested.
Maximum RAM disk capacity : 384K
RAM disk sizes possible : 320K, 384K, 192K + 384K
Maximum number of drives : 2
Sectors per track : 32
Tracks per 64K : 8
Maximum tracks per drive : 48
Slot assignment : 3
Apple 5 1/4 inch floppy drives have a total usable memory of 128K (140K total
less four tracks reserved by DOS) so that MultiRam C’s full 384K disk drive is
the equivalent of three standard Apple floppy disks,