new MS-DOS 7.10 installation in old 486

March 26, 2017 at 19:13:04
Specs: MS-DOS 7.10, 486/8MB
I just installed ms-dos 7.10 on an Epson ActionNote 486. I ran memmaker and found the ram available to run programs is quite a bit less than I had with 6.22.
i'm wondering if some of the new things that 7.10 loads in autoexec.bat are really necessary or even usable on this 1991 era 486. Can anyone advise?

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#1
March 26, 2017 at 23:49:38
I think dos 7.10 is the version commonly associated with windows 98. When I would set up those systems I would copy the memmaker files from dos 6.22 into the windows 98 command folder because they were not included with 98. I think there was a download for windows 95 from microsoft that included those files but that version was the same as came with 6.22. So unless someone has cobbled together a dos 7.10 installation with an updated memmaker then the version you used with 6.22 should be the same as your 7.10.

That said, memmaker is not perfect and can give different setups for different hardware. And a lot depends on how your config.sys and autoexec.bat files were originally set up as memmaker keeps anything loaded there. Different mouse or cdrom drivers between the two computers can vary the available memory too.

If you have any concerns you can post back your config.sys and autoexec.bat and we can take a look at them.

Edit I just looked and found the memmaker files I last used. They were dated 3-23-95 so must have come from the microsoft download rather than 6.22 as 6.22 files were dated from 1994. I compared the file size of memmaker.exe from both versions and they were both 119,557 so I'm sure they're the same version, just different dates.

message edited by DAVEINCAPS


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#2
March 27, 2017 at 06:51:43
During the 7.10 install there was a stretch where it appeared to be copying files from C:\. I think it was moving files from the C:\DOS directory used by 6.22 to its own working directory C:\DOS71. I even deleted the DOS directory using DELTREE (after backing it up on another drive) and everything appears to work normally.
My concern is that since 7.10 was written for a generation of computers newer than the old Epson the OS may try to set things in autoexec.bat or config.sys that the BIOS can't handle. In which case they would sit uselessly using up RAM.

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#3
March 27, 2017 at 23:52:05
Memmaker will add (if they're not already there) himem.sys and emm386.exe to config.sys to make the memory between 640K and 1 meg available for stuff it loads on bootup. That would include Dos internal commands and any mouse, cdrom or sound drivers you've added.

If 7.10 is equivalent to windows 98 dos it should work fine on that hardware as 98 would run on 486s, although it would have needed more than 8 meg of ram.

You could look in bios setup and see if there's anything there about using Upper Memory but I think by the time 486s came along it was just assumed that memory was available.

If you can, post back the config.sys and autoexec.bat that memmaker modified.


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#4
March 28, 2017 at 05:17:53
Thanks. I don't see a means to attach files here. I do have himem.sys and emm386.exe in config.sys already. Several things are loaded into high or upper memory, including DOS. I'll check to see if any LOAD commands can be changed to LOADHIGH.

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#5
March 28, 2017 at 18:58:22
If you open config.sys and autoexec.bat in something like notepad you can just copy and paste them to your next posting.

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#6
March 28, 2017 at 19:48:04
Thanks. Don't hold your breath. I answer these on my phone mostly. The computer in question doesn't go online. So I won't be copying and pasting from there. I am fully aware of the way to do this. I just have to get to it.
I have manually modified autoexec.bat to load everything conceivable into upper memory and added noems to the emm386 line in config.sys.
When I run mem the largest conventional ram to run a program is 535 MB. With MS-DOS 6.22 and no changes to hardware that figure was 577 MB. In fact I get a higher number now doing it manually compared to what memmaker gives me.

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#7
March 29, 2017 at 01:04:21
That's good. I always thought memmaker did the best job but maybe not.

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#8
March 29, 2017 at 05:16:03
So did I. It shocked me.

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