And if we could get extra memory too, without sacrificing software compatibility inherent to the 64k ROMs, then of course that would be nice as well (although any memory above 512k would be used as a RAM disk in conjunction with the 64k ROMs and no ROM hack).

Click to expand...

The Outbound Laptop Model 125 which uses Mac Plus or SE ROMs has four extra SIMM sockets, so eight total. The extra four are totally devoted to a RAM disk--up to 16 MB. And it's maintained even when the machine is powered off, so one can keep the OS and apps on the RAM disk to make the machine super fast.

Examining an Outbound Laptop might lead to some interesting add-on card possibilities for the pre-Plus and Plus and SE models.

Actually, I've only ever tried 4 MB SIMMs in the RAM Disk slots. One of these days I've got to try 16 MB SIMMs in there. But even a 16 MB RAM disk kills the time that the battery stays charged if the machine is unplugged. Been thinking about building some SIMMs with SRAM...