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Yes. DDR2 modules are backwards-compatible. Any module up to 1 GB will work, although the module will not run at its full speed.
PC5300/PC5400 667MHz SODIMM Chip will be compatible for the Dell Inspiron 1721.
Memory Modules
cmos bios chip
what is the function of the wr signal on memory chip
On-chip memory is a memory that resides on microcontroller itself. e.g RAM. It may be one of the Internal RAM or Special Function Register (SFR). Off-chip memory is external ROM or EPROM.
BIOS chip
no
Registers represent the number of memory locations. A 2K memory chip has 2x1024=2048 memory locations. Hence there are 2048 registers in a 2K memory.
There's no such thing. The iphone does not have a memory chip you can plug in. If you mean internal spare parts then ebay.
To install laptop memory, you will need to first consult the instruction manual. Afterwards, you can buy the memory chip, open up the laptop and then place the memory chip inside.
The BIOS chip is located on the motherboard