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中国DOS联盟论坛 » DOS疑难解答 & 问题讨论 （解答室） » Does anyone know how to compress the IO.SYS and COMMAND.COM files in MS-DOS 7.x View 4,100　Replies 19
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Original Poster Posted 2003-02-23 00:00　·　 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
Wengier
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The IO.SYS and COMMAND.COM files in MS-DOS 7.x are especially large, more than 300K total. Can anyone compress them? I’ve tried UPX, PKLITE, APACK, DIET, and COMPREXE, but none of them worked.
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Floor 2 Posted 2003-02-24 00:00　·　 中国 香港 环球全域电讯
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To compress programs in DOS 7.x/8.x, you can use COMPREXE -h
But COMMAND.COM cannot be compressed
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Floor 3 Posted 2003-02-24 00:00　·　 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
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I know, that person on the UPX forum already said so. But COMMAND.COM, IO.SYS, and FORMAT.COM and the like still won’t work.
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Floor 4 Posted 2003-02-24 00:00　·　 中国 香港 香港教育大学
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I tried it. IO.SYS can be compressed with Comprexe -h, Command.com can be compressed but can’t be used, and for Format.com you should still use the one compressed by the author of APACK.
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Floor 5 Posted 2003-02-24 00:00　·　 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
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Which version of APACK was used to compress FORMAT.COM? I tried versions 0.91, 0.98, and 0.99, but none of them worked. Also, although IO.SYS can be compressed by COMPREXE, the compression ratio is too small, basically the same as not being compressed at all.

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Floor 6 Posted 2003-02-24 00:00　·　 中国 香港 香港教育大学
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This FORMAT.COM was compressed by the author of APACK himself
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Floor 7 Posted 2003-02-24 00:00　·　 中国 香港 香港教育大学
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Open attachment
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Floor 8 Posted 2003-02-24 00:00　·　 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
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Strange, did the author of APACK never release this version of APACK that can compress FORMAT?
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Floor 9 Posted 2003-02-25 00:00　·　 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
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Roy, do you have compressed versions of MODE.COM, SYS.COM, and CHKDSK.EXE and the like?
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Floor 10 Posted 2003-02-25 00:00　·　 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
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Also, I found that besides COMPREXE, EPACK 1.6 can also successfully compress files like EDIT.COM (although the compression ratio is not as high as COMPREXE), and it can also successfully compress files like FORMAT and MORE. Although the COMMAND.COM file compressed with it can run(!), it uses more than 70K more conventional memory.
Wengier - 新DOS时代

欢迎大家来到我的“新DOS时代”网站，里面有各类DOS软件和资料，地址：
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Floor 11 Posted 2003-02-25 00:00　·　 中国 上海 金山区 电信
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Compressed COMMAND.COM and IO.SYS files, experts and moderators please work on it
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Floor 12 Posted 2003-02-25 00:00　·　 中国 香港 香港教育大学
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The following is quoted from Wengier at 2003-2-25 1:38:44:
Roy, do you have compressed versions of MODE.COM, SYS.COM, and CHKDSK.EXE and the like?

I don’t have MODE.COM, but I do have SYS.COM and CHKDSK.EXE
Open attachment
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Floor 13 Posted 2003-03-03 00:00　·　 美国 肯塔基州 费耶特县 列克星敦 Charter_Communications
Wengier
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That CHKDSK is the same size as the original one.
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欢迎大家来到我的“新DOS时代”网站，里面有各类DOS软件和资料，地址：
http://wendos.mycool.net/

E-Mail & MSN: wengierwu AT hotmail.com （最近比较忙，有事请联系DOSroot和雨露，谢谢！）

Floor 14 Posted 2003-03-13 00:00　·　 中国 江西 吉安 电信
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Compress command.com?
It is itself a command interpreter. If you compress it, who is going to interpret how to decompress it?
Seems impossible.
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Floor 15 Posted 2003-03-26 00:00　·　 中国 江苏 南京 电信
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Why compress these programs? If it’s to fit more stuff onto a boot disk, that’s understandable, but what’s the point of compressing them for normal use? I don’t get it. Could it make them run a bit faster? I think it would only use more memory, right?
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