0022-002B ---- Intel 82355, part of chipset for 386sx

                 initialisation in POST will disable these addresses,
        only a hard reset will enable them again.

0022   r/w 82335 MCR memory configuration register
0024       82335 RC1 roll compare register
0026       82335 RC2 roll compare register
0028       82335 CC0 compare register
002A       82335 CC1 compare register

         values for CC0 and CC1:
         00F9,0000  enable range compare CC0 0-512K  CC1 disable
         00F1,0000  enable range compare CC0 0-1024K CC1 disable
         00F1,10F9  enable range compare CC0 0-1M    CC1 1M-1M5
         00E1,0000  enable range compare CC0 0-2M    CC1 disable
         00E1,0000  enable range compare CC0 0-2M    CC1 disable
         00C1,0000  enable range compare CC0 0-4M    CC1 disable
         00C1,40E1  enable range compare CC0 0-4M    CC1 4M-6M
         0081,0000  enable range compare CC0 0-8M    CC1 disable