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- CRAM.COM
- VERSION 1.0 written 6/1/86
-
- This version of CRAM is a preliminary version, released as a test
- for some of the features in CRAM. Please be aware that although I
- have tested cram, I have only tested it on my system and have not
- been able to assure that it will work at 100% on all systems.
-
- CRAM is a Compressed RAM disk. It takes an existing diskette and
- compresses it down into a dos file and then this compressed disk can
- be loaded into memory as a ram disk. Many times a ram disk is used to
- hold utilities and applications, but is never written to. CRAM is a
- a read only ram disk.
-
- The procedure for using CRAM is:
- 1: Prepare a diskette that you would like to have as a ram disk.
- CRAM will allow the ram disk to be drive A: and therefore, if you like,
- you can boot off of the CRAM disk. If the disk is a word processing
- disk or other application you may not want to boot off of the CRAM disk
- and will not have to put a system on it. Use a freshly formatted
- diskette, and put all files directly onto the diskette. Avoid erasing
- files from the diskette as erasing leaves the data on the diskette,
- which makes your CRAM disk larger.
- 2: CRAM the diskette. Enter the CRAM command and choose the option
- for cramming the diskette into a dos file (option 1). Then answer
- the questions about where the disk to be crammed is located and where
- the dos file is located. DO NOT PUT THE DOS FILE ON THE DISKETTE BEING
- CRAMMED. When you are done you will have a dos file with the crammed
- diskette in it. It will be anywhere from 10% to 30% smaller than than
- a whole diskette. Make sure your target diskette will have enough room.
- 3: Diskettes can be uncrammed onto another diskette. CRAM will
- even format the diskette for you, but remember CRAM is like DISKCOPY
- and will destroy any old data on the diskette that you are using
- to uncram the file to.
- 4: Load the CRAM disk into a RAM disk. This is option 3 on the
- options menu. You can also load the CRAM disk from a batch file
- by entering CRAM FILENAME N
- where filename is the disk,path and filename of the crammed disk file
- and n is the disk that the CRAM disk is to identified as.
- If you load a CRAM disk into memory the CRAM file goes into high memory
- and the system will reboot. This is not a complete reboot, so if you use
- any other memory resident programs, like Side Kick in memory then
- the system will hang. CRAM should only be used to install ram disk
- on a virgin system, one with no memory resident programs.
- If you select A as the disk for CRAM then the system will reboot off
- of the CRAM disk. This has certain advantages such as COMMAND.COM
- reloading at ramdisk speed and the AUTOEXEC executing like lightning.
- You can also load any disk that copies with DISKCOPY into memory as
- the boot disk. This includes "fixed" infocom games and some versions
- of flight simulator.
-
- This is version 1.0 of CRAM disk which means other versions are
- coming down the pike. I have used only a run-length compression
- scheme for now so the compression is not too good. Preliminary
- observations show that I will be able to get up to 60% compression
- on the next release. I have the specs for loading CRAM into JRAM
- extended memory as well as EMS and protected memory, but have no way
- to test these until venture capital comes up with the boards or an
- AT.
- If you have questions concerning CRAM please address them to
- me at:
- PC-ROCKLAND BBS
- (914) 353-2176
-
- Thanks,
- Keith P. Graham