Model: PS/2 8525 (a.k.a. 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. It tossed out the low-end Model 25 and 30 and replaced it with 286- and 386sx-based units, such as the Model 30-286 and Model 55sx.
If you remember back to those days, expansion cards came with DIP switches and jumpers that needed to be manually set on the card before you installed them in the system. IBM's PC XT (1983) and PC AT (1984) both brought with them considerable innovations in PC design that cloners quickly copied.That something was the PS/2. Power-on the system (8525).
It was a shared bus where each card in the system shared bandwidth and CPU access.Another limitation to the ISA standard was configuration. Continue reading → This entry was posted in PS/2 Model 25 … If there was ever an Edsel of the PC industry, it was the IBM PS/2 line.
Up to that point, IBM itself had favored traditional 5.25-inch disk drives. 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.
The company promised a new graphical OS (which I'll talk about later) that would compete with the Macintosh in windowing functionality.Even today, many new PCs ship with "PS/2 connectors" for mice and keyboards, although they have been steadily falling out of fashion in favor of USB ports.Every model in the PS/2 line contained a 3.5-inch microfloppy drive, a Sony-developed technology that, until then, had been featured most prominently in Apple Macintosh computers.The low-end PS/2 Model 30 shipped with a drive that could read and write 720KB double-density disks.
As such, when the IBM PC became a smashing success that even IBM didn't anticipate, it was a ripe target for cloning.When Phoenix Technologies successfully reverse-engineered the PC BIOS in such a way as to bypass copyright problems, the only barrier to entry by clone companies disappeared. This is potentially the ‘cutest’ desktop computer IBM made: the Personal System/2 Model 25. 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. This is a 16Mhz 386sx-based machine that came with 4MB of RAM and a 40MB hard drive. Other models introduced something completely … IBM PS/2 Hardware Maintence Manual, Third Edition, October 1994 (10-94, 2.53MB) Model 25.
The original price of a 30MB Model 55sx was $3,895 as you can see from Check out some of the innovations inside the PS/2 by browsing the 7. 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. The first was its When Microsoft signed the deal to supply PC-DOS to IBM, it included a clause that allowed Microsoft to sell that same OS to other computer vendors--which Microsoft did (labeling it "MS-DOS") almost as soon as the PC launched.As the IBM PC grew in sales and influence, other computer manufacturers started to look into making PC-compatible machines. Unplug the display signal cable from the system. The low-end PS/2 Model 30 shipped with a drive that could read and write 720KB double-density disks.
Comment and share: Looking back at the IBM PS/2 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). Dynalogic and Compaq followed with PC work-alikes of their own in 1983, and soon, companies such as Phoenix Technologies developed IBM PC-compatible BIOS products that they freely licensed to any company that came calling. Naturally, some of them, such as VGA, advanced over time to the standards that we have today, but they all got their start with the PS/2.The Mac introduced the 3.5" drive, but the PS/2 made it a standard. Beyond that, these machines were limited to a 720Kb low-density floppy drive where other models had a 1.44 Mb high-density drive.
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