Amiga A4000 - Fast Memory; Fast RAM Banks and SIMM Size

4-2
Adding Memory
memory types, Fast memory and Chip (graphics) memory, can be
increased this way.
See Appendix A for detailed information
on the required parameters
of acceptable SIMM modules.
Note
Fast memory can also be added using Amiga bus and
CPU slot boards; however, using the motherboard
sockets leaves expansion slots free for other options.
The following sections explain memory options
and considerations,
including:
•
•
•
•
•
•
Fast versus Chip memory
SIMM
memory size
Fast RAM bank locations
Page mode versus static-column mode
Installing SIMM units
Testing memory installation
Fast Memory
Fast memory (also called Fast RAM) is general purpose non-Chip
memory
that the microprocessor can access at full speed. The
A4000 has four SIMM sockets for Fast RAM expansion. These are
the four sockets nearest the edge of the motherboard. The fifth
socket is for
Chip RAM expansion, covered in a later section.
Fast RAM Banks and SIMM Size
The four Fast RAM sockets are labeled on the motherboard as
Banks 0,1,2, and 3, and they must be filled in that order. If your
Amiga already has one or more banks occupied, place additional
SIMMs
in the next higher numbered banks.
The
Fast RAM SIMMs can be one of two memory sizes: one
megabyte (1 MB)
or four megabyte (4 MB). By filling the indicated
banks with the appropriate size SIMMs, the following Fast RAM
configurations
are possible.