For 200A, it is a standard DDR-400 512MB desktop memory, insert onto a desktop memory slot.
So I upgrade my 200A with a spare 1GB memory, it works.
For 100A, the memory module is exactly same as 200A, so I insert the memory pull out from 200A, into a 100A box.
Since there are two H/W version for 100A, the newer one (which the internal LAN ports are configurable) can detect the additional memory (ie from 256MB to 512MB), but my another 100A with old H/W version, the system still reported there are only 256MB memory, although I have inserted a 512MB memory module onto the board.
1x CPU Type Intel Xeon E3-1225 V2 (Ivy Bridge), 3.2GHz (4 cores)
RAM Size 8GB (DDR3 4Gx2)
Compact Flash Size 16GB MLC SATA BGA
CP ASIC in the unit 2 X CP8
NP ASIC in the unit 1 X NP6
Local Built-in Storage 120GB MLC
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