How does RME 3.4 report Cisco1600 memory?

[ed.tarento]

RME 3.4 reports

RAM Size(MB) 6.00

NVRAM Size(KB) 7.33

NVRAM Used(KB) 1.48

"sho ver" for the device reports

IOS (tm) 1600 Software (C1600-Y-M), Version 12.0(11), RELEASE SOFTWARE (fc1)

cisco 1603 (68360) processor (revision C) with 6144K/2048K bytes of memory.

8192K bytes of DRAM onboard

7K bytes of non-volatile configuration memory.

4096K bytes of processor board PCMCIA flash (Read/Write)

Configuration register is 0x2102

Is 6MB really the memory or in this case is it 8MB?

[thomas.chen]

Both the 'sh version' command and the RME 3.4 displays the correct information of the memory. The architecture of the router 1600 series is such that, phyisically, DRAM is a combination of 2 MB on-board non-parity chips, and one Single In-line Memory Module - SIMM (72-pin, 60 ns, with or without parity). Hence, If SIMM is non-parity, total DRAM is 8 MB (2+6) in your case, it can be upto 18MB. If SIMM is with parity, total DRAM is 6 MB (on-board 2 MB will be disabled) in your case, whereas it can be upto 16MB in other cases.

For detailed information in this regard, please refer to ,

Cisco 1600 Series Router Architecture

http://www.cisco.com/kobayashi/technotes/arch_1600_5406.shtml#memory

[etarento]

Thomas, thanks for the input, yes I saw that URL and it wasn't really clear.

So where RME 3.4 reports

RAM Size(MB) 6.00

and "sho ver" reports

cisco 1603 (68360) processor (revision C) with 6144K/2048K bytes of memory.

8192K bytes of DRAM onboard

The router has 8MB of DRAM, calculated by adding the on board 2MB and the 6MB SIMM? I guess the bit that surprised me was the existence of a 6MB SIMM. I thought it was a case 1,2,4,8,16 etc?

So to upgrade a 1600, take out the old SIMM (6MB in this case) and put a new one in?