Changes
Nova
,/* Ports */
The interface uses only one port (&FE82) to map the NVRAM in and out. It is possible to map it at any address multiple of &2000.
The four higher bits of the byte sent to port &FE82 determine the base address: 0 = &0000, 2 = &2000, 4 = &4000, ..., E = &E000.
The NVRAM, when it is enabled, masks 8K of RAM or ROM and replaces it with its own contents. Four NVRAM pages of 8K are available.
