MEMORY ADAPTER OPTION FOR RAINBOW 100
=====================================
  DEC Order Code: PC1K1-AK  Memeory Adapter Option for PC100-A
	
  The memory adapter option lets you upgrade your system to
include up to 832 Kbytes of parity main memory.  This option
serves as an interface that allows you to use the 128- and
256-Kbyte memory options and add-on chip sets on your rainbow 100
(PC100-A).
	
  To install the memory adapter option, you remove the 8088
microprocessor chip from Rainbow's system board and insert the
memory adapter board into the memory option slot on the system
board.  An 8088 microprocessor on the memory adapter replaces the
one removed from the system board.  The "Memory Adapter Option
Installation and Testing Guide" takes you through the
installation process.
	
  Once the adapter option is installed, the additional memory
configurations are handled in exactly the same way as for the
Rainbow 100B, except that you are adding the base memory modules
to the adapter, rather than directly to the system board.
	
  A menu-driven utility program, included with the hardware,
patches the CP/M-86/80 or MS-DOS operating system to take
advantage of the additional memory.
	
	
128- and 256-KBYTE BASE MEMORY MODULES AND ADD-ON CHIP SETS
===========================================================
  DEC Order codes:
    PC1XX-AC  128-Kbyte Base Memory Module
              Inlcudes base memory module with
              eighteen 64-Kbit chips.
	
    PC1XX-AD  256-Kbyte Base Memory Module
              Includes base memory module with
              nine 256-Kbit. chips
	
    PC1XX-AT  64-Kbyte Add-On Memory Chip Set
              Includes nine 64-Kbit chips.
 	
    PC1XX-AZ  256-Kbyte Add-On Memory Chip Set
              Includes nine 256-Kbit chips.
	
  The 128- and 256-Kbyte base memory options and add-on memory
chip sets are designed to provide up to 768 Kbytes of additional
main memory, for a system total of up to 896 Kbytes on the
Rainbow 100B and 100+.
	
  To use these options on the Rainbow 100 (PC100-A) for a system
total of up to 832 Kbytes, you need the memory adapter option
(PC1K1-AK).
	
  According to Digital, these memory options provide a simple,
cost-effective way to expand your Rainbow's computing power, and
to keep pace with the future.  Eight different increments of
additional main memory are available so that you can select and
install the memory best suited to your needs.
	
  Here's the way this memory expansion system works on the
Rainbow 100B and 100+:  A dedicated option slot on the system
board holds one base memory expansion module.  Choose between the
128-Kbyte module or the 256-Kbyte module.  Snap one of these base
modules onto the system board for an immediate system upgrade of
128 or 256 Kbytes, respectively.  Whichever base memory option
module you choose, simply add more memory chips to it for still
greater system expansion.
	
  Two different memory chip sets (a 64-Kbyte chip set and a
256-Kbyte chip set) are available for adding more memory to your
base module.  See the chart below for the possible
configurations.
	
  No modificationsa to the set-up parameters are necessary after
installation of an upgrade.  Your Rainbow 100B or Rainbow 100+
will automatically display a message on the screen after
installation, verifying the total amount of RAM now available.
	
  All memory options include partity detection, which may be used
to ensure the integrity of your data and application programs.
	
  Note: These chips are MOS volatile RAMs and could be damaged
when they are added to the base modules.  Digital recommends that
installation be done by an Authorized Digitial Dealer or by
Dicigital Filed Service.  Customers desiring to install their own
chips should carefully follow the instructions for installation.
	
                                               SYSTEM TOTAL
          MEMORY CONFIGURATION             100B  100+     100
 =================================         ==========  ==========
	
128-Kbyte Base Memory Module
Options for PC1XX-AC:
  [] Add module "as is"                       256 K      192 K
  [] Add one 64-Kbyte chip set to module      320 K      256 K
  [] Add one 256-Kbyte chhip set to module    256 K      448 K
	
256-Kbyte Base Memory Module
Options for PC1XX-AD:
  [] Add module "ass is"                      384 K      320 K
  [] Add one 64-Kbyte chip set to module      448 K      384 K
  [] Add two 64-Kbyte chip sets to module     512 K      448 K
  [] Add one 256-Kbyte chip set to module     640 K      576 K
  [] Add one 64-Kbyte chip set and 
      one 256-Kbyte chip set to module        704 K      640 K
  [] Add two 256-Kbyte chip sets to module    896 K      832 K
	
	
	
Source: Rainbow Handbook    EB 25844-69
        (c) Digital Equipment Corporation
        Spring 1984 Edition