[WireCPU] Couple smaller memory models (8k/32k)

Some smaller memory models since previous options were only 128k, 64k, and 128b - or 1mb, 512k, 1k effective; 

128 is too small to implement things like buffers or the interrupt table, but
64k is too big for smaller applications (eg, BIOS/ACPI chip)

This adds 8k and 32k models.

Also fixed a small typo (iteraction -> interaction)