How much memory does the HP DesignJet 500 come with, and can it be expanded?

The HP DesignJet 500 comes with 16MB of internal Random Access Memory (RAM). To add memory, you must first purchase an optional HP-GL/2 Accessory card (PN C7772A), and then you can add either 64MB (PN C2387A) or 128MB (PN C2388A) of memory for large file processing and improved printing. (Page 13)