The PCM-8520 embedded PC can hold (and use) 128 MBytes of RAM (on SO-DIMM), and has a CF card slot to hold the 128 MB used as a system disk. This system is available from Advantech, the specifications are no longer available on the web.
These parts were bought in May 2002 for about 600 Euro, 128 MB of RAM (60 EUR), and a 128 MB CF card at 89 Euro.
This is what it looks like:
This is the case the board above will be built into. I do this to get a more compact content for the CD player casing, and to have all standard computer connectors secured and conveniently accessbile.
For the power needs of this PC (5V for all the logics, 12V for peripheral devices), there is a specialized power supply: