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中国DOS联盟论坛 » DOS启动盘 & LOGO技术 （启动盘室） » How did the Super MS-DOS 7.10 boot disk manage to get more than 800K of upper memory? View 595　Replies 8
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Original Poster Posted 2004-02-21 00:00　·　 中国 四川 成都 电信
bhore
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I've been making boot disks myself. After loading with EMM386 /NOMES and UMBPCI, I can only get a bit over 80K of upper memory.
I don't know what else was added in the Super MS-DOS 7.10 boot disk, so I'd appreciate it if an expert could let me in on it.
When I manually choose not to load IFSHIP.SYS, I still get only a bit over 80K, but if I put this file onto my own disk and boot from it, it's still only a bit over 80K, and I also didn't see any loading option for it in the Super MS710 config...... I really want to know
Floor 2 Posted 2004-02-21 00:00　·　 美国
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IFSHLP.SYS uses very little memory, so actually there's no need to worry about it.
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Floor 3 Posted 2004-02-21 00:00　·　 中国 四川 成都 电信
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You still haven't said how to reach more than 800K of upper momoery.
It's not a typo on my part, it really is more than 800K, not 80K.
Floor 4 Posted 2004-02-21 00:00　·　 美国
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More than 800KB of upper memory, really? Don't kid around, it's completely impossible. And at present no DOS boot disk can do that. If you say it wasn't a typo, then you must have gotten it wrong.
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Floor 5 Posted 2004-02-21 00:00　·　 中国 河南 安阳 联通
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At most only 360K
Floor 6 Posted 2004-02-21 00:00　·　 中国 广东 佛山 三水区 电信
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The UMB area is located in DOS's reserved area, and that reserved area is only 384K in size, so how could you possibly get 800K out of it?
When IBM PCs first came out, they could only access 1024K of memory. Of that, 640K was left for DOS, while 384K was reserved for other uses. To maintain compatibility, this standard cannot be changed unless you make an entirely different DOS.
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Floor 7 Posted 2004-02-21 00:00　·　 中国 四川 成都 电信
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I also think it's unbelievable.
It's just that I found this happens when DOSLFN can be loaded into UPPER (without loading smartdrv).
Floor 8 Posted 2004-02-21 00:00　·　 中国 四川 成都 电信
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If smartdrv is loaded, doslfn seems unable to load into upper, and then it's only a bit over 80K.
I'm using VMware 4.05, so maybe it's a VMware issue.
But if I use the files from a boot disk made by a Win98 system to boot, then whether I load doslfn or not, it never reaches that number. But if I copy the files from your disk (command.exe, io.sys, msdos.sys, himem.sys, doslfn...... and so on, basically the files used during boot) onto a disk I made, then it can also reach 800K.
Floor 9 Posted 2004-02-21 00:00　·　 中国 四川 成都 电信
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By the way, when using mem, what does the Reserved shown below upper refer to? Reserved memory? 384K?
Why is it sometimes 0, and sometimes 30M...?
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