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/* Technical */
ROM version has a size of 256K. It is split into 16K pages. 2 Pages are standard CPC roms, one of which is a "extension rom".
Part of the Brunword word processor is copied into RAM. This is done by it's "extension rom". The ROM Select port (&DF00) is decoded and has 2 roles. First is to select which ROM page appears in the range &C000-&FFFF of the Z80's address space.(It seems bit 7,6,5,4 must be 0).Bits 3..0 are decoded as the page number. Page 1 and 2 only seem to be visible at this time.
The second role (when bit 5,4 are used), makes a page visible in the range &4000-&FFFF of the Z80's address space.
Bit 5 seems to be rom enable/disable, bit 4 is set for the second role (0 for other), and bits 3..0 are the page number.
The exact decoding of the ROM select port is unknown.
