I have a Compaq Deskpro EN 6266 Deskpro EN PII 266 Computer, pictured below.

When I try to insert a 4.7 GB optical disk, the PC stops. When I use a 720MB optical disk it says that I don't have permissions to copy files.

Is there a way to copy the files to some external storage medium? The computer does not have an Ethernet port. It only has 5.7GB of data on it (with Windows and all programs) but there are important files on it and I don't want to lose them.

Front view, showing drives

Rear view, showing ports

Close up of some of the ports

  • Welcome to Retrocomputing Stack Exchange. Please read the tour. It's not quite clear what you're trying to ask - I'll put your question on hold so that it is clear that the question is still being edited. What specifically are you having problems with?
    – wizzwizz4
    Commented Sep 25, 2017 at 16:18
  • Also, it looks like you accidentally deleted an image.
    – wizzwizz4
    Commented Sep 25, 2017 at 16:19
  • @wizzwizz4 I don't know how I can copy the files to an external source.I wrote that in my post "is there a way to copy the files to some external? I don't see why you put it on hold Commented Sep 25, 2017 at 16:19
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    Also what operating system does it run? It's likely to be one of windows 95, 95 OSR2 or 98. Only windows 98 supports USB out of the box.
    – PeterI
    Commented Sep 25, 2017 at 16:37
  • 1
    @PeterI Windows 98 Commented Sep 25, 2017 at 16:38

6 Answers 6


There are three basic ways:

a) Get a LAN card and set up a workgroup with all drives shared and access whatever needs to be backed up to your new machine. This is quite dependent on installed software. But chances are good that some NE2000 compatible card driver is already installed. You have to check what I/O bus system is used and buy the apropriate card. As new PCI or ISA cards are getting rare, Ebay should be a good source.

b) remove the disk(s) and attach them via USB adaptor to a new machine. With such a setup you may read the drive from next to any modern machine, as USB, as well as drives over USB, are quite standardized. This will also require way less hardware knowledge than putting the old drive into a new machine. If they (and I assume there are multiple drives, as 5.7 wasn't the original disk size) are PATA (also called IDE) drives, a $15 PATA to USB adaptor will do the trick. For SCSI drives an adaptor might be less common and way more expensive. Adaptec did once have one available, called USBXchange. A Google search might be helpful.

c) if these are USB connectors, all the way to the left, right beside the audio connector, you might be able to just plug a USB drive there. I don't remember if Win98 supported USB disks out of the box. Have you tried to plug in a USB stick? Just try it. Preferably one with less than 32GiB and FAT32.

For installing any drivers (or other software), and if you have no other machines with floppies, just use the CD. It should be able to read writeables. Make sure to burn a CD not a DVD or Bluray.

This brings us to way #4:

d) Use some kind of old fashioned file transfer program. Put whatever program you prefer on a floppy (or CD) and run it on both machines (the old one and some new one), after connecting them via a serial cable. Some USB to serial if your new machine doesn't offer any classic serial port. This would cost about $15 for the USB/serial, and maybe another $10 for a gender changer.

Oh, and there's one more, without the need for any hardware tinkering:

e) Boot a live Linux from CD. USB will then most likely work and you may use whatever USB stick to transfer your disk data within a short time. Try Knoppix, as it's well known to come up even on really weird machines. There are many other small, directly bootable Linux distributions, but Knoppix is well known for easy handling even if you're not a Linux buff. Just make sure you pick a CD-based one.

(The more as I look at this machine, the less it seems like a Retrocomputing case)

  • PATA isn't compatible,is this SCSI?image.prntscr.com/image/wDaJ4sAFRwCnDcAQpErVlQ.png Commented Sep 25, 2017 at 19:19
  • Two different technologies. And that picture just shows two serial and a parallel. Ken Gobers assumption was about the connector in one of the horizontal slots. It's too blurry to see if it's realy an SCSI or something else.
    – Raffzahn
    Commented Sep 25, 2017 at 19:23
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    None of these connectors is of any help here. you need to open the machien anyway. Well, unless you find some way to install SLIP and connect it to a SLIP server like on Linux :))
    – Raffzahn
    Commented Sep 25, 2017 at 19:35
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    Win98 first edition didn't have USB mass storage support (so, no thumb drives or external hard drives).
    – Mark
    Commented Sep 25, 2017 at 20:04
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    What's 17 days in the life of a computer that's already 20 years old, @Mark?
    – scruss
    Commented Sep 26, 2017 at 19:29

Most (but not all) Windows 98 installations come with HyperTerminal, a serial comms program that supports file transfers over ZMODEM or Kermit. With another computer, a USB-Serial adapter and a null modem cable, you can get files across one at a time.

This will be slow - likely maxing out at 115200 bps / ~ 11 KB/s - but may be the least intrusive option. I wouldn't want to risk installing anything on a hard drive of that age.


The optical drive in your computer is probably a CD-ROM reader. Unless it actually says "Recordable" or "Rewritable" on the front, don't assume that it will be able to record. It may not handle DVD-ROMs at all. Check to see if it has the DVD symbol on the front.

Your computer appears to have a SCSI connector, so the simplest method may be to connect an external SCSI drive, format it and copy your files to it. But finding such a drive might not be so simple nowadays.

It is probably easier to just add an Ethernet adapter to the computer so that you can copy files to another computer over the network. You will need to open the computer up first to confirm whether your expansion slots are PCI or ISA. They are probably PCI but you should check.

  • Are you sure it is SCSI ? image.prntscr.com/image/wDaJ4sAFRwCnDcAQpErVlQ.png Commented Sep 25, 2017 at 19:18
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    That "external SCSI" port is most likely parallel.
    – Coxy
    Commented Sep 26, 2017 at 8:02
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    I think Ken is referring to the port on the horizontal expansion card about halfway across the back. Not to the thing next to the serial ports.
    – Tommy
    Commented Sep 26, 2017 at 11:21
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    Correct, the SCSI port is the one above the USB, audio and keyboard/mouse ports. It was not uncommon at that time for Compaq to include a SCSI adapter in their enterprise business line of computers.
    – Ken Gober
    Commented Sep 26, 2017 at 14:06
  • 1
    ...And even if the drive is a recorder, do not assume that facilities are installed that allow recording with anything else than mastering software (as opposed to just copying them the normal way). However, the "720MB" in the original question likely IS a CD-R medium... Commented Oct 2, 2017 at 19:40

I hated that machines. If my memory serves well they need Floppy to get into BIOS. But in a nutshell it is a PC compatible machine with ISA or PCI slots so you can even find a network adapter for it (I still got a box of 10MBit of them somewhere). But with modern components I see this approaches:

  1. HDD

    In case it have PATA IDE interface so you can use any IDE PATA HDD but be careful about the barriers so do not use too big partitions. if you got any or even use the machines HDD directly. For that you need another computer with PATA or USB to PATA.

    In case you got MFM or SCSI then you would have hard time to use it. But that is unlikely as the Compaqs I saw at that time all had standard 40pin IDE PATA.

  2. LPT/COM

    If you boot into MS-DOS there are utilities used to communicate by LPT or COM ports. I used it a lot back in the days. Try to find/use:


    That is native to MS-DOS and you just need to add


    into config.sys to enable to use it.

    Another option is to use FX.exe It does not need anything it is stand alone app. So on host computer you just run MS-DOS and connect by either COM or LPT cable ... config both sides FX.exe and copy what you need. The host computer can do this for example in emulator ... you just need access to real COM or LPT. In case on your modern computer is no COM nor LPT ports you can buy USB to RS232 or USB to LPT reductions but some of them would require tweaking the baud rate and bits to work properly.

    Also Windows support networking over COM and LPT too I think it is even compatible with the interlnk.exe you just need a proper cable and add the network manually in windows on both sides.

  3. USB

    you got USB port I think it twas v1.1. There are memory sticks that are compatible with Win9x you just need driver for it. That will be the simplest way to interconnect. You just format the stick with FAT32 and use as external removable storage :). The problem is to find stick that has Win9x drivers. I got 2 of them somewhere. Your best bet is to find SD/MMC card reader for USB compatible with Win9X ... yes those still exist and usually got drivers shipped with them. I even have a mini CD with the drivers somewhere. Or scan USB Flash drives manufactors for Win9x drivers and when found just buy such drive.

  • I tried to enter in bios with Esc,F1,F9,F10,Delete but just shows an _.If it needs floppy then the solution is to remove the hard.It's very complicated with externals. Commented Sep 26, 2017 at 10:53
  • It should be F10 to get into the BIOS on this system (manualslib.com/manual/841849/Compaq-Deskpro-En-Series.html, p. 2-5). BIOS setup on a floppy was certainly required for some of the earliest Deskpro systems in the 80's, but I suspect it was long gone by the Pentium II era.
    – rakslice
    Commented May 28, 2018 at 4:09

I had the misfortune of having to deal with many of these Compaq systems about 15-20 years ago. The hard drive is SCSI, and probably so also is the CD drive. There is a SCSI controller card installed in the bottom expansion slot, as shown by the mini HD-50 pin external connector.

Booting a Compaq Deskpro is incredibly slow, due to the SCSI controller doing a scan for devices on the bus that takes about a minute or so, before it attempts to boot the hard drive.

Your controller most likely looks something like this image from Wikimedia Commons: (from user Nosachevd, cc-by), https://commons.wikimedia.org/wiki/File:Tekram_DC-300B_Fast_SCSI_ISA_controller.jpg

Tekram DC-300B Fast SCSI ISA controller

SCSI is obsolete since about 2010, but PCI and even PCI-express controllers are still available if you look around on eBay or Amazon. Example Amazon search result:

Adaptec 2248700-R U320 PCI Express X1 1-Channel SCSI Host Bus Adapter, US$49.00, https://www.amazon.com/Adaptec-2248700-R-Express-1-Channel-Adapter/dp/B000NX3PII

With a modern controller like this, you could plug your old SCSI drive into a computer running Windows 7/8/10 and directly access files on the drive.

Though for simplicity's sake, you should avoid any modern SCSI controller that also says "RAID" in the name of it, as these may not recognize the drive.


You would need a computer from about 2012 or older which had the large 4-pin Molex power connectors for IDE/SCSI hard drives. Eventually newer systems dropped those in favor of all-SATA style power connectors.

But even this can be worked around for the persistently stubborn, with a "15-pin SATA male to 4-pin female" power adapter, to plug the old drive into a modern SATA-only drive power connector, for about US$5..



If you know nothing about the complexities of SCSI IDs, termination, etc, the least complicated thing to do would be to use a 68-pin ribbon for the internal connector of the above card, and then a 68 pin to IDC 50 pin SCSI adapter.

If I continue to use Amazon for this example, a "wide" (68-pin) SCSI internal ribbon cable costs about US$10..

A 68 pin to "IDC 50 pin female" (the old-style large connector) SCSI adapter is another US$10..


If there is no way to connect the drive to a data transfer system common to two of your computers, the "nuclear" solution is to remove the hard drive and connect it to an external drive controller. This is a last resort - the other answers should be used if possible.

  1. Disconnect the computer from power and wait for the capacitor to discharge.
  2. Unscrew the case of the computer, taking care to remember which screw goes where.
  3. Carefully disconnect the cable attached to the hard drive from the motherboard.
  4. Carefully remove the drive from its housing.
  5. Identify the interface.
    • Parallel ATA: A 40-pin (2 by 20) connector with a ribbon cable attached
    • Serial ATA: 7 pins, a gap, then 15 pins
  6. Purchase or otherwise gain an adapter for this connector.
  7. Connect the adapter to a modern computer.
  8. Copy the files from the hard drive.
  • So it needs an adapter. Commented Sep 25, 2017 at 16:57
  • Through this method, yes. There are others.
    – wizzwizz4
    Commented Sep 25, 2017 at 18:23
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    A pentium 2 mainboard well-predates SATA. I'm positive OP will find Parallel ATA / IDE drive.
    – Criggie
    Commented Sep 26, 2017 at 0:31
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    @Criggie Or, possibly, some SCSI variant (see earlier comments about Compaq sometimes including SCSI HBAs). Certainly not SATA or SAS.
    – user
    Commented Oct 10, 2017 at 11:57

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