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STACKER NOTE Stac Electronics Technical Note
Subject: Stacking the HP 95LX Palmtop Computer
Tech029 - 3/06/92
2 Pages
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The HP 95LX is palmtop computer that runs under MS-DOS 3.2. It has 1mb of
on-board RAM that is configurable between RAM and disk drive. An example
would be configuring 256k of this on-board RAM as system RAM and the
Remaining 768k as the C: drive. There are RAM cards available which vary in
size from 512k to 1.5mb. These have their own battery to maintain the data
and are treated just like floppies. There is a slot on the left side of the
HP 95LX which accepts the cards and is referenced as drive A:. This Note
presents a procedure for "Stacking" this A: RAM card.
The 95LX Filer/File Transfer Utility allows file copies, deletes etc.
It allows you to run applications, gives a shell to the DOS prompt, and
allows connection between the HP 95LX and serial port on a desktop machine
which runs a package called the Connectivity Pack. The Connectivity Pack
allows you to copy files between the two machines. This procedure involves
the use of the Filer and Connectivity Pack, but does not give detailed
instruction on their use. Please refer to the 95LX documentation.
Note:
There is an external drive made by PAMCO that can connect to a desktop
machine via the parallel port that allows a desktop machine to directly
access the RAM cards for the HP 95LX. The current device driver for
these drives is NOT compatible with Stacker. PAMCO is currently looking
into this situation.
PROCEDURE:
Due to the lack of RAM on the HP 95LX the Stacker Install will not run.
Therefore, a desktop machine is required for part of this procedure.
1. On the desktop machine, run Stacker's Install program to personalize
the files and copy them to the hard drive. After this is done, escape
out of Install without creating a drive.
2. Use the following command to build an empty Stacker drive on the desktop
machine.
SCREATE C:\STACVOL.DSK /S=1.5 /R=4.0
This will create a 1.5mb Stacvol file with an anticipated compression ratio
of 4.0 to 1 to accomodate the high compression ratio of Lotus 1-2-3 files.
(The /S= specifies the size of the RAM card in MBytes. The size may vary
depending on the size of the RAM card.
3. Use Sattrib to remove the hidden, system and read-only attributes of
the Stacvol file with the following command:
SATTRIB -R -H -S C:\STACVOL.DSK
4. On the HP 95LX, while in the Filer utility, choose SYSTEM to get
to a DOS prompt.
5. Make certain there is no data on the RAM card which should be in drive A:
6. At the root directory of drive C: on the HP 95LX add the following
line to the CONFIG.SYS file: (If a Config.sys does not exist, create
one by typing: Copy con Config.sys <Enter>...then add the device
line <Enter>...then press <ctrl z> to save the file)
DEVICE=C:\STACKER.COM @
9. Using the Connectivity Pack on the desktop machine and the Filer/File
transfer utility on the 95 LX, transfer STACKER.COM and SCHECK.EXE to
the Root directory of the 95LX.
10. Transfer STACVOL.DSK from the desktop machine to the RAM card in drive A:
11. Re-boot the HP 95LX to load the Stacker device driver.
12. Mount the A: Stacker drive by typing STACKER A at the
DOS prompt. Conversely, you may unmount by typing STACKER -A .
You may want to create batch files including these commands so the
Stacker drives may be mounted and unmounted directly from the Filer.
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1992 STAC ELECTRONICS