the router contains one or two 80-pin flash memory simms. you can upgrade flash memory by replacing the existing 4-mb simm with an 8- or 16-mb simm, or by adding a simm to the second flash memory socket. you can install from 4 to 32 mb of flash memory. the size of the simms in the two flash memory sockets need not be the same.
flash memory simms are not interchangeable with dram simms (used in cisco 3620 and cisco 3640 routers) or sdram dimms (used in cisco 3631 and cisco 3660 routers).
each flash memory simm socket corresponds to one bank of memory. fill banks starting with 0, and empty banks starting with 1. bank 0 must always be filled first and emptied last.
table 5-6 lists possible flash memory simm cofigurations and the resulting total flash memory.
flash memory simms have a polarization notch to ensure proper orientation and alignment holes to ensure proper positioning, similar to that shown in figure 5-7. flash memory simms are installed with the connector edge down and the polarization notch near the front of the chassis.
to avoid damaging esd-sensitive components, observe all esd precautions. to avoid damaging the underlying mainboard, do not use excessive force when you remove or replace simms.
figure 5-14, figure 5-15, and figure 5-16 show the location of the flash memory simms on your router's mainboard.
