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中国DOS联盟论坛 The time now is 2026-10-31 11:46 |
47,815 topics / 349,930 posts / today 0 new / 48,290 members |
| DOS开发编程 & 发展交流 （开发室） » How to programmatically access the 64K BIOS contents under DOS? |
| Printable Version 989 / 1 |
| Floor1 liulaotou | Posted 2004-02-16 00:00 |
| 初级用户 Posts 1 Credits 106 | |
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It seems to use ports 70 and 71, but I don't know the exact implementation method. Please advise if anyone knows.
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| Floor2 笑傲江湖 | Posted 2004-02-20 00:00 |
| 初级用户 Posts 61 Credits 271 | |
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I/O 70 and 71 are the port addresses for accessing CMOS RAM. Usually, after booting is finished, the BIOS contents are automatically mapped to the highest end of the virtual address space, such as FFFF0000h~FFFFFFFFh. You only need to switch to protected mode to access this address range!
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