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How does RME 3.4 report Cisco1600 memory?


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?

2 Replies 2

Frequent Contributor
Frequent Contributor

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

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?

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