Background & history
The IBM P75 was the most powerful portable computer released in 1990 as it was the first mobile computer to sport the then cutting-edge, Intel 486 CPU. It was also perhaps the most expensive personal computer that you could commercially buy – depending on configuration, the P75 could be priced north of $18,500 or about $37,500 in 2020 dollars!
This computer was not something that you could pick up at the local computer store – the IBM P75 was a Ferrari (or literally a modern Tesla’s worth) of mobile computing and were to be ordered direct from IBM or an authorized dealer. But this begs the question: why did a computer the size of a briefcase cost as much as a luxury car in 1990?
Let me remind you of the year – it’s 1990. We saw the start of the Gulf War with Iraq invading Kuwait – we also witnessed the launch of the Hubble Telescope and the airing of the first Simpsons episode. The dawn of a new decade was upon us, with pop culture and technological innovation shifted into overdrive.
Intel had just unleashed the next generation i486 CPU, setting the stage for more sophisticated software (most importantly games) and GUI-based multitasking to come. The new 486 CPUs were pricey, however, and only those needing computing horsepower for AutoCAD and the like bought them at first. Other than CPU innovations, color displays had also just hit the market, with the release of the NEC Prospeed CSX – a $9,000+ A/C powered portable, with EGA resolution and 16 Colors. Impressive right? Oh, by the way, the screen measured a massive 8 by 5 inches, and the “laptop” weighed a knee-crushing 19 pounds. Portable computing in 1990 was really just getting on its feet.
Though buying a 19-pound laptop with a palette of 16 washed-out colors may seem comical to us today, other brands had begun to find their footing (and thankfully beginning to take the weight off our shoulders). Portable computers were beginning to be measured in inches instead of feet, though most were still hefty, thick, and now only slightly back-breaking.
That is not to say all laptops in 1990 were overweight – some especially light models had already entered the exclusive “5-pound-or-lighter club”. Though some very early 90s laptops had shed the weight, they had also shed their performance too, with these early “notebook-type” laptops being vastly underpowered. This deliberate reduction of performance was a necessary compromise as high-performance components weighed more and demanded more power. Don’t forget, battery technology at the time was primitive – an average 286 based laptop could barely stay powered for a couple of hours and were not able to sufficiently power a 486-based portable machine in 1990.
Another reason why lighter laptops lacked performance was that miniaturized high-performance components simply did not exist; the miniaturization of high-performance components (like large capacity hard drives, or a low-power-consumption version of the 486 CPU) for use in laptops were on the horizon, but would only become available in 1992.
The need for portable desktop-grade performance in the late ’80s and early ’90s gave rise to “portables.” These were a class of mobile computer that did away with batteries, and instead, crammed as much power-hungry, high-performance components as could be put in a relatively “transportable” package. If you haven’t noticed, we love portables here on Retropaq! (Check out Compaq’s last portable computer, the Compaq Portable 486 from 1992, and the funky lunchbox shaped Compaq Portable 386 from 1987) These portable computers were not designed to be used on a plane; instead, these portable desktop-class computers were intended to be plugged into the wall when you moved from point A to point B.
Although relatively heavy compared to laptops, portables were quite svelte and compact compared to the traditional 80’s luggable. Some were laptop shaped (though really not intended for use on your lap, due to their weight), and others were briefcase shaped. These computers had reduced portability but vastly outperformed battery-powered laptops. Portables were really in a class of their own, with most of the high-end portable pedigree being deployed in exotic applications such as portable file servers, building-worksite AutoCad stations, or even as the personal computers of high-level, high-upper-back-strength executives, who needed power and performance at any cost.
Enter: The IBM P75
The IBM P75 was the most powerful portable computer that money could buy in 1990 by a huge margin. Being the first mobile computer to use the Intel 486 CPU really set the IBM P75 apart. Other high-end portables were running 386 DX’s, which were fast – but the 486 was on a whole other level. People didn’t even quite know what to use a 486 for in 1990, aside from greatly speeding up AutoCAD and acting as portable servers. But, let’s put it this way – a 386 would comfortably run Windows 3.1 with excel and word processing, but a 486 could handle running Windows 95 – where you could surf the net with Netscape Navigator and run SimCity 2000 (albeit in a world of orange) in a separate window with no problem.
In fact, the P75 was described as a portable “server” due to its then-immense computing power. It came with a VGA amber/orange gas-plasma display, capable of simulating 16 shades of grey (more like 16 shades of orange), a full travel IBM keyboard (quite clicky), a large SCSI hard disk, and a floppy drive making it a truly portable desktop-class computer.
Here are the detailed specifications of the IBM P75:
|Brand, Model Name & Number||IBM PS/2 Model P75 486 – Model 8573-161 (160 MB Hard Disk Drive) – Model 8573-401 (400 MB Hard Disk Drive)|
|CPU||486 DX-33 with 66.666 Oscillator, CPU and Oscillator can be modified to be socketed.|
|RAM||16 MB – 4X 4MB 72 Pin Simms 70 NS Parity|
|Expansion||4 MCA Slots – 32-bit AVE, 32Bit MME, 2x 16 Bit Short|
|Hard Drive||Originally 160 MB or 400 MB SCSI 1 – 1 GB Max Capacity, can use SCSI2SD|
|Floppy Drive||1.44 MB IBM standard proprietary drive|
|Internal Video||Onboard XGA-1, Gas Plasma, 640×480, 16 Greyscale, 10 inches.|
|External Video||Onbaord XGA-1, 256 color (can be upgraded to High-Color on Win 95 with 3rd party drivers) at 800×600|
|Ports||Parallel Port, Serial Port, VGA port, PS/2 Mouse Port, External Floppy Drive Port, SCSI-1 Port (C-60)|
As you can see – its specs are pretty impressive and more fitting of an average desktop computer from, say 1993, which is why the P75 cost as much as a luxury car at the time.
Needless to say, not too many of these IBM P75’s were made – concrete production or sales numbers from IBM are hard to find. However, it’s safe to say whilst there were niche applications for the IBM P75, it wasn’t something your average Joe would be buying. If you had one of these in 1990 – please, please leave a comment and tell us what it was like to use this screamer-rocket of a computer back in the day!
Take a Closer Look at the IBM P75:
- The Most Powerful Portable – IBM P75
- Take a Look Around (The Outside)
- But wait, there’s more – Under the Hood (Interior)
- Tips & Tricks (Restoration: CMOS Battery, Getting POST)
- Booting Up & Configuring the IBM P75