I strongly suggest a pico-PSU and a +12V laptop battery. The battery must source 5A at minimum for operate a A600.
It transform the +12V in +5 and -12V (among other not-required tensions). Prefer a 60W pico-PSU for use with your A600.
The +12V line accepts the 10.3~12.3V range for normal operation (remember: the pico unit don't regulate the +12V rail, that is simply bypassed).
