Installation manual

Installation
One of two companion expansion cards can be added to the MultiRam RGB to
increase the memory beyond 1 megabyte. The first card is the MultiRam //e
which can add 768K. When these two cards am combined there is a total of
1.75 megabytes of memory. The second card, the MultiRam Plus, can add up
to 4 megabytes for a combined total of 5 megabytes when piggybacked to the
MultiRam RGB.
Because the memory connector is on the back of the MultiRam RGB card,
neither piggybacked companion card will interfere with a card that is plugged
into slot one of the Apple //e.
RGB Video Connector
The RGB connector is a double row of male pins located near the top and front
of the card, just under the LED lights. The RGB Video Connector is used to
output ‘lit RGB video signals to an RGB monitor. Checkmate Technology
does not include an RGB cable because it is an unnecessary expense for those
not using an RGB monitor, nor do we know which RGB cable to include.
Checkmate Technology manufactures two different RGB cables for the
MultiRam RGB. For Apple type TTL RGB monitors the cable ends in a DB-
15 connector that is secured to the back of the Apple //e. For IBM type TTL
RGB monitors the cable ends in a DB-9 connector that is secured to the back
of the Apple //e. The DB-9 cable not only has a different connector, but it
must also take the Apple format RGB video signals and turn them into the
IBM format RGB video signals. Chapter 6 - Hardware and Software
Compatibility explains the differences between the Apple RGB and IBM RGB
video formats.
CPU Port and CPU Memory Port
For the MultiRam EX card to linearly address the memory on the MultiRam
RGB card a cable must be run from it to the CPU Port. The 74HC273 chip is
removed from the MultiRam RGB and the cable plugged into the socket. If
the MultiRam //e or the MultiRam Plus card are piggybacked, a cable must be
run from the MultiRam RGB CPU memory port to the piggybacked card to
allow the MultiRam EX to linearly address this memory.
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