maximum ram upgrade for iqon pc?

Hi Guys.

I have a IQON PC heres the spec


Maximum Memory Capacity: 2097152 MB
Currently Installed Memory: 1024 MB
Available Memory Slots: 1
Total Memory Slots: 2
Dual Channel Support: N.A.
CPU Manufacturer: GenuineIntel
CPU Family: Genuine Intel(R) CPU 2140 {at} 1.60GHz Model 15, Stepping 2
CPU Speed: 1600 MHz

What would be the maximum size ram I could install??