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How do I install DOS 3.1 to PC XT hard drive from 5-1/4 floppy? [message #3339] Sun, 12 August 2018 01:51 Go to next message
MikefromNJUSA is currently offline  MikefromNJUSA
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I have a PC XT clone I am trying to install DOS 3.1 on. I cannot find the original DOS 3.1 disks anywhere. I have found several IMG files of these disks but I need info on:
1. - what it the proper way to convert these img files back to a real 5-1/4 floppy? What program is recommended to take the IMG file and turn it into the real disk again and write it to the 5-1/4 floppy? I have another PC, a WIN 98 PC with a CD drive and 5-1/4 floppy so I can read the CD and then write the 5-1/4 disk and then put that disk in the XT just like the original DOS disks from 1987. However, I cannot find any programs to take this disk image file and turn it into the original Disk format so I can write it. What does everyone used to convert the img files back to the original disks? Somebody told me diskcopy does this, but it does not. I did find that if I use WInzip, a program within Winzip called 7 Zip, does unzip the image file an write it to a folder that looks like it has the original DOS and system files on it.
2. Assuming I do get the original DOS 3.1 disks recreated, how do I get DOS on the hard drive? I do not have any instructions and there is nothing on the disks saying how to do it, no install or setup procedure either. I think when I put the floppy in, that disk will boot up the machine,. I think, from memory, I can fdisk the C drive, then what do I do to install DOS? Will it ask me if I want to install DOS?
HELP!!!!
Re: How do I install DOS 3.1 to PC XT hard drive from 5-1/4 floppy? [message #3340 is a reply to message #3339] Sun, 12 August 2018 02:25 Go to previous messageGo to next message
Ultrax is currently offline  Ultrax
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As for converting the .img files to a real 5-1/4 floppy, have you tried Win32DiskImager or DiskWrite? If your 5-1/4 drive shows up as a drive under Explorer in 98 you should be able to use either one of these programs (I'd recommend using DiskWrite since it supports 98).

And for getting the DOS on the hard drive, try using an installer image, if available. (did DOS 3.1 have an installer?Wink
It will allow you to choose an install destination, obviously being your hard drive in this case.

EDIT: link to DiskWrite: click here

Again I recommend using this because it has more legacy support than Win32DiskImager.

Also, welcome to the forums!


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[Updated on: Sun, 12 August 2018 02:29]

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Re: How do I install DOS 3.1 to PC XT hard drive from 5-1/4 floppy? [message #3341 is a reply to message #3340] Sun, 12 August 2018 02:57 Go to previous messageGo to next message
MikefromNJUSA is currently offline  MikefromNJUSA
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I just looked up Diskwrite on the interntet, and it says it converts files TO img. Does it extract the img and write back to a floppy? This seems to be the problem. Also, I need to find the procedure used to load DOS onto the Hard Drive of the target machine. There is no install program on the DOS disks (I've seen all the files on them) When you got the original DOS disks 30 years ago, there were instructions on how to do this. Nobody can seem to find these instructions! Thanks again!
Re: How do I install DOS 3.1 to PC XT hard drive from 5-1/4 floppy? [message #3342 is a reply to message #3341] Sun, 12 August 2018 22:45 Go to previous message
Ultrax is currently offline  Ultrax
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Oh, you must've found the wrong Diskwrite because the one I linked to is only for writing floppies Laughing

As for installing DOS 3.1 onto your hard drive - well, that's where my expertise ends. Razz
Maybe, within DOS, try and copy all of the DOS files onto your hard drive? Again, I don't know too much about those versions of MS-DOS, but it may work Very Happy


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