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                            n/SYSTEMS
                      21460 Bear Creek Road
                       Los Gatos, CA 95030
                         (408) 354-7188

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09/12/90



                               M D I S K

      A fast 1 megabyte RAM disk for your AMPRO Z80 Little Board!


With 1 megabyte of RAM chips now widely available for under $85, now is
the time for AMPRO Z80 Little Board users to contact us about our MDISK
RAM disk!  MDISK is an add-on RAM disk board for the AMPRO Z80 Little
Board that provides space for up to 1 megabyte of 256k dynamic RAM chips
that are used as a solid state disk drive.

MDISK provides a fast and responsive RAM workspace environment to speed
up disk-intensive operations like wordprocessing, database access, modem
file transfer, program development and all other file access operations
by reducing the time required for disk read/write operations.  Now you
can read or write to RAM disk files at RAM memory speeds!  Add MDISK to
an all-floppy system for especially useful improvements in speed and
productivity.

Because programs resident on MDISK are accessed at memory speeds, all
your often-used utilities on MDISK become 'memory-resident', eliminating
the need to waste TPA with extensive ZCPR3 RCP segments. The transient
versions of your Z utilities now operate as quickly as the much more
limited versions resident in your RCP!  With ARUNZ.COM (renamed to
CMDRUN.COM) and ALIAS.CMD resident on MDISK, you also can have a full
range of instant aliases at your fingertips.

If you haven't yet used a system with a RAM disk workspace, you're
really missing something.  You may think, as I did, that it's too much
trouble to load a RAM disk with all your commonly used utilities each
time you turn on your computer, but ZCPR3 aliases and the fast copy
utility ACOPY (included) make the whole process automatic.  The ZCPR3
file search path allows you to access occasionally required utilities
without copying them to MDISK.  You'll soon get so used to the new speed
and responsiveness of utilities operating on MDISK that you'll wonder
how you ever got along without it!


  o  MDISK is a 5.75" x 5.25" printed circuit board that plugs
     into your AMPRO Z80 socket.  Your Z80 chip plugs into a
     socket on the MDISK board.  Board-to-board spacing is 1/2"
     (7/8" spacing required when also using a SMARTCLOCK) with an
Š     overall total height of 1 1/4".

  o  You plug up to 32 standard Japanese 256k dynamic RAM chips
     into the sockets provided on MDISK for up to 1 megabyte of
     extended RAM.

  o  The MDISK driver software enables the extended RAM to be
     used as a solid state disk drive, complete with a system
     track for instant warm boots.  The driver software is
     supplied as a boot-time utility for use with standard AMPRO
     systems, including extended ZCPR3 systems and NZCOM (using
     the current BIOS version 3.8) that automatically installs
     the MDISK drivers into the memory image of the BIOS.  They
     do not waste TPA by loading under the CCP.  Source code for
     the BIOS driver inserts is also included for custom
     installation into your AMPRO BIOS source code.

  o  MDISK also includes an extended RAM test utility.

  o  MDISK requires 5vdc via a standard disk drive power connector.

  o  NOTE:  In order to use MDISK, your Little Board must be
     modified to replace the eight 64k RAM chips with the 16 pin
     DIP sockets we provide and to add one jumper.  If you can
     use a soldering iron, this is an easy modification and
     doesn't affect normal operation of the Little Board.
     Complete instructions are included.

     If you feel uneasy about working on your Little Board,
     n/SYSTEMS can arrange to do the modification for you at
     nominal cost.


The MDISK RAM disk board (No RAM chips are supplied), including the
manual and software disk, is now only $129 (California residents please
add sales tax).  Add $5 for shipping and handling.  Shipping is normally
via first class mail, but UPS may also be specified.  UPS COD is an
additional $5.  Orders with accompanying check or money order are
normally shipped the same day they are received.

For those of you who prefer to build things yourselves or want to build
a modified MDISK RAM disk board, perhaps for use with non-AMPRO systems,
n/SYSTEMS offers a bare MDISK printed circuit board along with all
documentation, including an MDISK manual with schematic, parts list and
software disk, for only $29, postage paid.

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