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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
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