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C > COMPAQ > Portable II     

Portable II

After having invented the first IBM-compatible transportable computer, and having recorded half a billion dollars turnover, Compaq decided to launch its second portable AT clone. The system featured an 8 MHz processor and a 10 MB hard disk in a package 30% smaller and 20% lighter than previous PC model.

The general engineering idea behind this machine was to provide a cut-down IBM PC/AT clone with fewer expansion slots (5), a small hard disk and a floppy disc. This allowed Compaq to make the Portable II smaller and lighter without sacrificing too much specification.

Like many portable systems of the time, the keyboard attached to the front of the case and when the machine was ready for carrying, it was like a sewing machine.

The machine was supplied with 640 KB of RAM which was the maximum that could be fitted to the main board. However, RAM could be taken up to 2.1 MB by using a custom-designed expansion card.

Technically the Portable II gave its user more power than an IBM PC/AT for almost half the price.
At the same time, Compaq delivered two desktop computers, the Deskpro PC/XT and Deskpro PC/AT, and two portable systems, the Portable/Plus PC/XT and the Portable 286 which was a full function PC/AT clone.


Lucio Libertini says:
The Portable 2 comes with a single 360kb 5.25" floppy drive, but it is compatible with 3.5" ones. Indeed, replacing the drive is the first thing that should be done, as 5.25" floppies in decent conditions are getting almost impossible to find, while 3.5" ones are still being manufactured. 360kb is also uselessly small for most applications.

A suitable floppy cable is required for the modification, not to mention a caddy to put the smaller drive in the tray. One can always affix it in there with other means, but the result is most inelegant.

The Portable 2 doesn't boot any MS-DOS bootdisk above version 3.2; 3.21, 3.3 and 6.22 didn't work. There is a likely exception: I didn't test MS-DOS 6.00 floppies, but the hard drive mine came with has that inside, so it must have been installed from floppies.
The Portable 2 does boot DR-DOS floppies of versions 3.41 and 6.00 (5.00 untested), but 6.00 is awfully slow, so I suggest sticking with the older version.

The compaq diagnostic floppy that's required for BIOS setup is incredibly hard to find; after extensive Googling I managed to find a floppy image that contained the required programs, but wasn't bootable. I made a bootable floppy with DR-DOS 3.41 and the diagnostics; you can find it here. It's a raw image, writable with rawwrite (and many other apps) under Windows and dd under Linux. The BIOS access program is setup.exe.

Mark Dodd's memories:
One arm is longer than the other after having to lug these things around for a year or so.
We had several within Telecom Australia equipped with network sniffer cards and other addon cards for looking after the myriad of different network technologies that existed within the 84,000 employee behemoth.
My biggest nightmare was getting caught between buildings at the end of the day so I had to lug the thing home on public transport. I remember one old fellow looking at it with amazement on the train and telling me how the same power used to take up two floors of a building. I told him it still weighs the same....

Rob Brown also remembers:
This was the field service engineers nightmare. You were supposed to be Compaq trained to service this machine but very few engineers were. The main challenge was just getting it open. It was the first pc to use the torx type screws. You could not get hold of a torx screwdriver for love nor money in those days and I had a specially filed down flat head screwdriver which could just about turn a screw if wasn't too tight.
Once you got the plastic case off, there was another steel case to contend with. There were a few access panels, but trying to get to the right components was really difficult. Then you had to put it back together, which was even harder.

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.


I''ve been trying to use the "send more information" form to correct the info I supplied ages ago (and that I forgot about entirely until I came across this page again and read my name), but it doesn''t seem to work, so I''m adding this post instead.

Ignore what I wrote about the versions of MS-DOS supported by the computer. I think I messed up while making the disk images, or possibly used bad disks$ the computer does indeed boot and run MS-DOS 6.22. Mine has it currently installed on the hard drive. Takes up quite some HD space, but it runs speedily. It''s possible to use drivespace compression, but when doing so everything involving disk access slows down to a crawl (the 286-8 is not a fast CPU), so I just dealt with it.

I managed to find a compatible 40MB Quantum hard disk (a ProDrive, I think - I don''t have it around now so I can''t check), but it''s a voice coil unit, and I like the stock stepper-motor drive''s delicious retro nature and sounds, so I kept that in.

Thursday 18th December 2014
Lucio Libertini

I have a Compaq II in excellent condition. I bought it from a 90+ year old man who had it sitting in a closet. (He was a techno hoarder). But it won''t boot. There was no user manual and so I can''t decipher the flashing kepboard lights, which I believe used to indicate the problem. I THINK the problem is the boot disc. The 5.25 floppy that came with it is IBM DOS 3.30. The disc appears to be in godo condition, but I don''t think this version of DOS works with a Compaq II. Does anyone know? If not, any idea where I can get a 5.25" floppy with the RIGHT DOS version on it so I can boot the machine. I think 3.1 was the latest version that worked on this machine. Correct? ANY help is GREATLY appreciated!

Saturday 3rd August 2013
Larry Collins (USA - Texas)

you remove the shell by sliding the side slides more open then normaly then remove 2 black screws
2 on each sides then keybaord has more screws DONOT BREAK IT OFF NOT A GOOD IDEA SINCE THIS HOLDS THE CASE TOGETHER AND THE HANDLE HOLDS ALL THE COMPUTERS WEIGHT USING ONLY 4 screws if you break the keybaord screws LIKE i Did now only two screws hold the keyboard and 4 hold the case and almost cracked the case screws on the slide door sides carefull not to overtightin the screws on case as not to crack old plastic to mutch..
ALSO there is a lot of torks screws not security screws thank god but they are none the less tork screws also the SCREEN needs 24V ac and 12V ac I think its ac anyway it seems resonable it would take 24V ac and 12v AC since screens are mostly ac!! but Ill remeasure to see what exactly it takes on the 3 peg 3 pin connector the rest is CGA but shows up B/w on green screen
HMM Arcade pacman on green screen cool
R G B synk and ground hmm 5 pins 6 signals cool that explanes the graphics card to the screen pin out all i need now is to get a nother thing w cga or use arcade signals and i can run screen using cga HMM I could remove drives and pcb and run a arcade pcb off the 12V DC and the 5vDC or just the 5VDC voltages and have a mini arcade machine protable cool!. this is only cause the screen is 15 KHz Arcade cga type REd blue green synk and ground signals.. (-) synk!.
anyway thats how you get the case apart the rest is using a torks bit and removing in order a lot of screws .. be care full not to break the dut (daughter board) off the tie wraps on the power mini pcb.
the reason the power supply is so complicated is cause it has screen 12V ac and 24V AC power on it..
the 12v going into the screen might be DC ill have to check.. if you live in the UK I siggest getting a USA computer back up 900 power back up box and running a 110-125V in to it then hook youre computers to these outlets but normal tube computer crt monitors plug into normal outlets not using the battery back up cause to many screens can kill battery premature witch could blow fuse on line pole outside! carefull do not over load a UPS ..

Monday 27th September 2010
adam weisbrod


NAME  Portable II
TYPE  Professional Computer
YEAR  1986
KEYBOARD  Full stroke 84-key with numeric keypad and 10 function keys
CPU  80286
SPEED  6 ou 8 MHz
CO-PROCESSOR  Socket for 80287 math coprocessor
RAM  640 KB on board, up to 2.1 MB
VRAM  Unknown
TEXT MODES  40 or 80 chars. x 25 lines (IBM CGA or monochrome modes)
GRAPHIC MODES  640 x 200 dots
COLOrsc  16 (Grey shades on built-in monitor)
SOUND  Built-in loudspeaker
SIZE / WEIGHT  17.7 (W) x 13.9 (D) x 7.5 (H) in. / 26 lbs
I/O PORTS  Serial, Parallel, external CGA monitor, Composite video
BUILT IN MEDIA  1/2 5.25'' 360 KB floppy disc drives, or 1 x FDD + 10 MB Hard disk
OS  MS-DOS 3.1
POWER SUPPLY  Built-in 130 Watt switching power supply unit
PERIPHERALS  3 x AT slots available among 5
PRICE  From $3199 (Single FDD) to $4799 (HDD)



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