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RT/CMOS | Address | and | NMI | Mask | Register | (Hex | 0070) |
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The | NMI | mask register is used with the | RT/CMOS | data | register (hex | ||||||||||||||||||
0071) | to | read from and write to the RT/CMOS | RAM | bytes. |
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| Attention |
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The | operation | following | a | write to |
| hex | 0070 | should |
| access | hex | ||||||||||||
0071; | otherwise, | intermittent | failures | of | the RT/CMOS | RAM | can |
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occur. |
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| Function |
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| 7 |
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| NMI | mask |
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| RT/CMOS | RAM | address |
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Figure | Address and NMI Mask Register | (Hex | 0070) |
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Bit 7 |
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| (disabled). This bit is set | to | 1 by a | |||||||||||||||||
Bits | These | bits | are | used | to | select | RT/CMOS | RAM |
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| addresses. |
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RT/CMOS | Data | Register | (Hex | 0071) |
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The | RT/CMOS | data | register is used with the | RT/CMOS | address | and | |||||||||||||||||
NMI | mask | register | (hex | 0070) | to | read | from | and | write | to | the | ||||||||||||
RT/CMOS | RAM |
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| Bit |
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| Function |
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| RT/CMOS | data |
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Figure | Data Register | (Hex | 0071) |
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ThinkPad 560/560E System Board