Gilderfluke&Co old MACs 8 bit Digital Audio System - Manual (Page 85)

- MX-100 / MX-200 -
- Memory Expansion Boards -
for use with DR-100, DR-300, or AB-100
Digital Audio Repeaters
A MX-100 or MX-200 Memory Expansion Board is used to increase the capacity of a Digital Audio
Repeater by 32 additional memory chips. Any number of these memory expansion cards can be used
on any Repeater card within the physical space limitations of the Repeater housing. The practical limits
are three MX-100's in an AB-100 AudioBrick case, and six MX-100 with one MX-200 on a DR-100 or DR-
300. This gives a capacity of up to 112 EPROMs on an AB-100 AudioBrick, or 240 EPROMs on a card
cage mounted DR-100 or DR-300.
The MX- expansion cards, like the Repeaters they work with, support EPROMs from 27C512 (64 KBytes
x 8) up to 27C080 (1024 KBytes x 8). A red LED on each MX- card shows when the memory chips on that
card are active. All EPROM sockets in the Repeater card with which the MX- is used with must be filled.
The EPROMs on the MX- card are installed starting with the socket marked as 'ROM 1' and extending
through the socket marked 'ROM 32'. There can be no breaks in the EPROM sequence, and the MX-
card must be completely filled if additional MX- cards are going to be used.
WHEN INSTALLING EPROMs, BE SURE TO OBSERVE THE 'PIN ONE'
MARKINGS ON THE EPROMs, SOCKETS, AND PRINTED CIRCUIT BOARDS.
PLUGGING AN EPROM IN BACKWARDS CAN DAMAGE BOTH THE EPROM
AND REPEATER!
The only difference between the MX-100 and the MX-200 are the height above the board the
EPROMs take. The MX-100 is the standard card. The EPROMs are mounted in standard-style EPROM
sockets and the cards can be used in any memory expansion card position. The MX-200 cards use
special low profile EPROM sockets. They are used when there isn't room to mount a normal MX-100 card,
as when 1, 3, 5, or 7 memory expansion cards are being used in a card cage mounted system and you
can't spare the extra slot a normal memory expansion card would extend into. MX-200 cards can only
be used as the last or only card in a stack of memory cards, as they don't have connectors on their top
to allow additional MX- cards to be stacked on their tops.
When using memory expansion cards in card cage mounted systems, Repeater fronts in special 2",
3" and 4" wide sizes are available. These can be ordered as needed under part numbers RF-200, RF-
300, and RF-400, respectively.
G ILDERFLUKE & C o . ¥ 205 S OUTH F LOWER S T . ¥ B URBANK , C ALIF . 91502-2102 ¥ 818/840-9484 ¥ FAX 818/840-9485
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