Port Number: 1002
Function: Memory-mapped flash chip size. This port is only applicable to older devices which feature a parallel flash chip.
Sets the flash chip size. 06 is the default (4 MB). 07 will map 8 MB, which will cause the 4 MB to be mirrored twice. Smaller values map less flash, possibly down to 64 K.
When this bit is set, the flash mapping is forced to 64KB (the equivalent of a 0 in bits 0-2).
Writes have no apparent effect, value does not latch.