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Bitfields for AMD-640 Shadow RAM Control Register 1

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Bit Description

7 - 6

 segment CC00h-CFFFh shadow RAM control
00 - shadowing disabled
01 - write enabled
10 - read enabled
11 - both read and write enabled

5 - 4

 segment C800h-CBFFh shadow RAM control
00 - shadowing disabled
01 - write enabled
10 - read enabled
11 - both read and write enabled

3 - 2

 segment C400h-C7FFh shadow RAM control
00 - shadowing disabled
01 - write enabled
10 - read enabled
11 - both read and write enabled

1 - 0

 segment C000h-C3FFh shadow RAM control
00 - shadowing disabled
01 - write enabled
10 - read enabled
11 - both read and write enabled

See Also:

#00983,#00993,#00994