Upgrading Eagle 450 On-board Memory
Page 7
Eagle 450 Upgrade Instructions, Rev. A00
INSTALLING MEMORY
The Eagle 450 supports from 4MB to 256MB of main memory: either one or two memory SIMMs of
4MB, 8MB, 16MB, 32MB, 64MB, or 128MB. Use 60ns SIMMs only; 70ns SIMMs will not work.
Unlike the AM-6000, SIMMs do not have to be installed in pairs: you can use either one or two SIMMs;
if you use two, they do not have to be of equal size. For example, you can install one 32MB SIMM and
one 16MB SIMM for a total of 48MB of memory.
The memory SIMMs install in connectors J10 and J11. See Figure 4-1 for the location of these
connectors. If you’re installing only one SIMM, it goes in J10. If you’re installing two SIMMs of
unequal capacity, the larger one goes in J10.
To install memory expansion SIMMs on the AM-138 board, use this procedure:
Remember, don’t follow this procedure until you’re at the proper place in the installation process
for your upgrade.
1.
Insert one SIMM (the larger if the SIMMs aren’t of equal capacity) in connector J10. Align pin-1
at the notched end of the SIMM module with pin-1 on the connector, as in Figure 3-2.
2.
Insert the SIMM module into the connector at a slight angle.
Rotate into the upright position.
The SIMM will engage the metal retainer clips and click into position, locking the SIMM in
place.
3.
If you are using two SIMMs, repeat steps 1 and 2 for the second one, at connector J11.
Setting Memory Jumpers
After installing the SIMMs, set the jumpers at location JP7 on the AM-138 board according to the table
below. As you turn on the computer, AMOS will automatically make the memory available. See the
diagram of the AM-138 in the next chapter for the location of the JP7 jumpers.
BANK0
JP7
1
2
4
1
2
4
BANK1
Figure 3-3: JP7 Memory Jumpers
The Bank 0 jumpers apply to the SIMM in J10; the Bank1 jumpers apply to the SIMM, if any, in JP11.
The correct jumper settings for each possible memory combination are shown in the table below. X
indicates the jumper is installed; O indicates it is not.