This is the last post in a 6 post series on the Compaq Portable 386 Computer. In this section we take a look at installing MS-DOS and using FDISK after using the diagnostic diskette. You can jump to:

  1. First Impressions
  2. The Gas Plasma Screen
  3. Booting Up & Opening Up
  4. The Floppy Drive
  5. The Hard Disk
  6. Installing MS-DOS
  7. Youtube VIDEO REVIEW

Now we’ve configured the hard disk / CF Card correctly, the next step is to install MSDOS.

Choosing Between Compaq DOS or MS-DOS

Now you have 2 choices in terms of what MS-DOS you can install – I recommend installing MS-DOS 6.22 for general use with the computer, but you can also install the original Compaq MS-DOS 3.31 that came with the computer from factory. Get the Compaq MS-DOS 3.31 disk image files here.

In my opinion, it was actually worthwhile to install the original MS-DOS just to poke around – the Compaq MS-DOS does offer some unique features that allow you to manipulate how text is displayed through the MODE command, but at the end of the day I found MS-DOS 6.22 more familiar and user friendly.

I won’t go into too much detail on how to install MS-DOS, but you can find some straight forward detailed step by step instructions here.

First make sure you have setup the hard disk / CF card properly by installing the cables and providing power. Turn on the computer with the Compaq Portable Diagnostic Diskette in the floppy drive. If you are using a 5 1/2 inch floppy drive, you will need to create the diagnostic disk using a 360K disk. If you are using a 3.25 inch disks, then you will need to use the 720k version. Boot into the Compaq Diagnostics program to make sure you have setup the hard drive correctly.

The cool thing if you use Compaq MS-DOS, you get this amazing retro COMPAQ logo from the 80’s at boot.

After confirming the hard disks are correctly setup, restart the computer and insert a MS-DOS boot disk or MS-DOS install disk – if all went well in previous steps, the computer should boot from this disk, then automatically run MSDOS setup. If you don’t have a setup disk and just used a MS-DOS boot disk, the computer should at least boot to command prompt, showing A:/>.

Double Check FDISK Settings

I recommend exiting MS-DOS setup to check that the hard disks / compact flash cards are configured correctly. Exit the setup program (press F3) and type FDISK at the command prompt and press enter – if all is well the FDISK program should load and give you a series of choices – press “4” to view the existing disk, partitions and logical drives. Follow the commands in FDISK to create your MSDOS partition(s) first (in case you want to setup multiple partitions or adjust their sizes), then restart and resume MS-DOS setup.

Once you have successfully installed MS-DOS, boot again from your dos boot disk, and then type FDISK /MBR at the command prompt – this adds the master boot record to your disk allowing your computer to boot from the CF card / hard disk directly. It seems this step is necessary even after MS-DOS installation, else you won’t get a hard disk command prompt. After executing FDISK/MBR, restart the computer once more. You should now be able to boot your Compaq Portable 386 to its hard disk MS-DOS prompt without needing floppies.

That’s it! As you can tell, restoring the Compaq Portable 386 is relatively straightforward if you’re even mildly tech savvy- the components are pretty robust, and due to the price of the computer at the time, they were built to last.

In an upcoming post I will show how I transformed my Compaq Portable 386 from an entry level 386 to an overclocked, Windows 95 “screamer” (thats right, I said Windows 95!)

Don’t forget to check out my video review on the Compaq Portable 386:

Installing Compaq or Regular MS-DOS 6.22

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