So, no update on this for a while; real life has been keeping me busy. Nonetheless, I have found some time recently to get another tranche of work done on the cart design, to the point of having a couple of working prototypes now in testing.
- 24MBit (3MByte) flash ROM
- 1MBit (128KByte) Ferroelectric RAM
Instead of battery-backed SRAM, the cart uses F-RAM, which maintains its contents in the absence of power, and has a data retention span on the order of a hundred years.
- USB mass storage emulation
The cart appears similar to a thumb drive, allowing ROM and RAM contents to be copied via drag and drop. No drivers are required, and supports all USB-capable platforms.