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DOS开发编程 & 发展交流（开发室） » How to get the total amount of physical memory installed on the current machine

Floor1　asbai	Posted 2006-04-16 23:31
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As the title says, which expert knows ======================= Solved by myself: EAX: 0x0000E820 INT 15h [ Last edited by asbai on 2006-4-17 at 08:55 ]

Floor2　xuantian	Posted 2006-04-16 23:41
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Oh, the motherboard's power-on self-test will display it. What else do you need to get...

Floor3　asbai	Posted 2006-04-16 23:57
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Is this the programming section? Of course it's for programming, heh. Both assembly and C are okay. The interrupts I found can only check up to 64MB at most. Only the XMS Driver's Query Any Free Extended Memory (Function 88h) seems to be able to retrieve memory larger than 64MB, but it only returns free XMS, and in actual use it always doesn't work (for a machine with 1G memory, the EDX still only returns more than 60MB, don't know why) [ Last edited by asbai on 2006-4-17 at 00:02 ]

Floor4　xuantian	Posted 2006-04-17 23:22
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I remember that DOS can only manage up to 64M?

Floor5　asbai	Posted 2006-04-18 02:59
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Originally posted by xuantian at 2006-4-17 23:22: I remember that DOS can only manage 64M or so DOS 7.1's built-in HIMEM.SYS supports the XMS 3.0 specification and can manage up to 4GB. Another thing: int 15h is a BIOS interrupt, not a DOS one, heh