Installation manual

Installation
Jumper Block
Near the bottom edge of the card, about 1/3 of the length of the card from the
left end, is a small plastic block mounted on two pins. This jumper block
must be removed if you have an early model of the Apple //e (Revision A
motherboard) in order for the RGB card to operate properly. Owners of more
recent models should leave the block on the card, since this jumper block
allows double hi-ms on these later motherboards. The Revision A
motherboards are not able to produce double hi-res displays. The Preparation
section of this chapter describes how to find out which motherboard Revision
you have.
LED’s
At the extreme top left end of the MultiRam is a row of five small, red Light
Emitting Diodes (LED). The group of four identified as Bank LED’s in Figure
2.1 are labeled 1,2,4, and 8. These LED’s provide a visual indication of the
exact 64K memory bank on the RGB card currently read from or written to.
Provided primarily for programmers’ use, the LED’s allow anyone to
determine if a program is using the card’s memory beyond the ordinary first
64K auxiliary bank. The Card LED, when on, indicates that the RGB card’s.
memory is being used; when off, it means that the piggyback memory card
attached to it is being used.
ADDING MEMORY
Your MultiRam RGB Card has four groups of eight sockets labeled “A”, ‘B”,
“C”, and “D.” Either a 64K or a 256K dynamic RAM set of eight chips may
be installed in each group. The four groups are clearly defined on the card (see
Figure 2.1).
With the four groups, there are fourteen RAM combinations possible as Table
2.1 shows.
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