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Bit mapped to control paging options.
! Bit !! Effect
| 7-3 || Unused, use 0 (Printer Port Strobe b4 and Disk motor enable b3 are not implemented in core3.0)
| 2 || Normal mode: High bit of ROM selection. Together with bit 4 from $7FFD port:
00 = ROM0 = 128K editor and menu system
01 = ROM1 = 128K syntax checker
10 = ROM2 = +3DOS
11 = ROM3 = 48K BASIC
Special mode: High bit of memory configuration number (see [[Memory map]]).
| 1 || Special mode: Low bit of memory configuration number.
| 0 || Paging mode. 0=Normal, 1=Special.
Any values written to this port should also be stored in $5B67 if you intend to use any OS routines.
'''NEW in core 3.0:'''
When exiting +3 special paging mode, the banks 5 and 2 are mapped back at regular place.
This is a minor edit
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