IBM still was the market leader, but it didn't like the fact that Compaq and others were taking so much business. They ranged dramatically in power and price; on the low end, the Model 30 (roughly equivalent to a PC XT) contained an 8MHz 8086 CPU, 640KB of RAM, and a 20MB hard drive, and retailed for $2295 (about $4642 in 2012 dollars when adjusted for inflation).The most powerful configuration of the Model 80 came equipped with a 20MHz 386 CPU, 2MB of RAM, and a 115MB hard drive for a total cost of $10,995 (about $22,243 today).
PS/2s running Intel's 80486 were introduced over time as well.Eventually, however, IBM abandoned the PS/2 line. Beyond that, these machines were limited to a 720Kb low-density floppy drive where other models had a 1.44 Mb high-density drive.

This meant that a 1981 PC, which shipped with five slots, left little room for expansion when it already contained a graphics card, a disk controller, a serial card, and a printer card--a common configuration at the time.With the PS/2, IBM chose to integrate many of those commonly used I/O boards into the motherboard itself.

Manufacturers tried to upgrade the standard several times, but they always fell back to the old 1.44Mb format.

It decided the thing to do was reintroduce the PC in a manner that it could control the old-fashioned way -- through patent protection.By creating a new line of PCs with technologies developed and owned by IBM itself, IBM thought that it could control the PC clone market.
MicroChannel's solution was to use a configuration disk. Comment and share: Looking back at the IBM PS/2 Each model in the PS/2 line included a built-in serial port, parallel port, mouse port, video adapter, and floppy controller, which freed up internal slots for other uses.Computers in the PS/2 series also had a few other built-in advancements, such as the IBM intended the mouse, as a peripheral, to play a major part in the PS/2 system.

By the time of the PS/2's launch in 1987, IBM PC clones--unauthorized work-alike machines that could utilize IBM PC hardware and software--had eaten away a sizable portion of IBM's own PC platform.

IBM PS/2 Model 25 (25-001) Leave a reply. PS/2s running Intel's … MCGA never gained adoption beyond the PS/2 Model 25 and Model 30.The true innovations that IBM laid claim to in the PS/2 line include:Of the technologies listed, the first three survived well into the twenty-first century.

The line launched in April 1987 with a high-powered ad campaign featuring the former cast of the hit Critics, who had seen more-powerful computers at lower prices, weren't particularly impressed, and everyone immediately knew that IBM planned to use the PS/2 to pull the rug out from beneath the PC-compatible industry. ---------------------------------------------------------------------------------------------------When IBM decided to enter the "microcomputer" market in 1981, it did so as sort of a skunk-works project. Compare the numbers: In 1983, IBM controlled roughly 76 percent of the PC-compatible market, but in 1986 its share slipped to 26 percent.IBM devised a plan to regain control of the PC-compatible market by introducing a new series of machines--the PS/2 line--with a proprietary expansion bus, operating system, and BIOS that would require clone makers to pay a hefty license if they wanted to play IBM's game. Unfortunately for IBM, PC clone manufacturers had already been playing their own game.In the end, IBM failed to reclaim a market that was quickly slipping out of its grasp. Originally designed to destroy the clone business, the PS/2 wound up derailing IBM instead.

Just about any company could have put them together into a computer system, but IBM added a couple of features that would give the machine a flavor unique to IBM. IBM PS/2 Hardware Maintence Manual, Third Edition, October 1994 (10-94, 2.53MB) Model 25. Up to that point, IBM itself had favored traditional 5.25-inch disk drives. The low-end PS/2 Model 30 shipped with a drive that could read and write 720KB double-density disks. It was a shared bus where each card in the system shared bandwidth and CPU access.Another limitation to the ISA standard was configuration. 3.

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