Orange Micro RAMPAK 4GS - Manual (Page 8)

development which require large amounts of memory to
load and run. For these situations, the RamPak 4GS
provides expansion capability to 4Mb.
Your RamPak 4GS has been specifically designed for
use with 256K x 4 DRAM chips. This allows you to
expand at a rate of 2 chips (or 256K) at a time, as
opposed to the 8 chip minimum expansion required by
other available products. When purchasing your
expansion chips, specify: 256K x 4, one megabit
DRAMS, 150 nanosecond (or faster), or
purchase your RAM expansion kits directly from Orange
Micro. If it seems odd that 8 one meg’ chips are
needed to add one meg’ of RAM to the system, refer to
APPENDIX C, which offers a brief discussion of bits and
bytes. Precise specifications of the RAM chips needed
to expand the memory of your RamPak are found in
APPENDIX D.
To expand your RamPak, you must first remove it
from the Apple IIGS.
Be sure to disconnect the power from the
Apple IIGS, since removing boards with
power on can severely damage your
equipment. Be sure to touch the power
supply to discharge any accumulated static
electricity.
Next, remove the cover from the IIGS. Locate the
RamPak 4GS at the far right of the machine. Lifting
upward with a gentle rocking motion, remove the
RamPak 4GS from the Apple.
The RamPak expands in segments called BANKS.
Each bank holds up to 1 megabyte when completed, so
your first bank is already half full. If you examine the
board you will see that the individual BANKS are clearly
identified, zero through 3, along the right edge of the
socket field. Each individual ROW of sockets is
identified, A through G, along the left edge of the
sockets. Each socket is also clearly marked in ascending
order, Ul through U4, along the top of the socket field.
Memory expansion must take place in the order
specified by the markings on the board. You must first
complete BANK 0, beginning with sockets 1 & 2 and
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