The IBM PS / 1 personal computer IBM tried in 1990, five years after the IBM PCjr a renewed attempt to establish themselves in the home computer market. In September 1994, the PS / 1 was replaced by the IBM Aptiva. All PS/1- and Aptiva models had a built-in modem to access online help and preinstalled software.
Position within the brand IBM
The term "PS / 1" should indicate a limited compared to the professional product line PS / 2 powerful machine. In contrast to the PCjr but the PS / 1 had a higher degree of compatibility with the PS/2-Systemen. The PS/1-Familie was intended for beginners and was sold in normal electronics shops along with comparable offerings from Compaq, Hewlett -Packard, Packard Bell, and others, a departure from the usual strategy that only IBM products, IBM to buy themselves were. All PS/1-Modelle contained a modem, so that the user could request assistance online at IBM. A special feature at all PS/1-Modellen was it that you could revert to the BIOS when both mouse buttons pressed when turning on the computer and thought this let go only after the power-on self-test. For the models 2011 and 2121, this process also led to the fact that the PC-DOS was booted from a built-in ROM instead of the hard disk. In this way the PS/1-Systeme had a basic protection against viruses, as its condition at delivery from the factory had to restore.
During the production of PS/1-Systeme there were different housing:
- 2011 Proprietary design, power supply in the screen
- 2121 Proprietary design, power supply in the screen, one ISA slot
- 2123 based on the IBM PS / 2 Model 30, only a few copies were made
- 2133 desktop model. The two digits 3 refer to the number of available ISA expansion slots and drive bays; CPUs from Intel 80486SX to 80486DX -33 ( sub-model 575 )
- 2155 desktop model. The two digits 5 refer to the number of available expansion slots and drive bays
- 2168 tower model. The numbers 6 and 8 refer to the number of available expansion slots and drive bays
The housing 2133 and 2155 were used in different model years; the tower unit 2168 was not published until later.
" DOS in ROM" models
The original PS / 1 contained a 10 MHz Intel 80286 CPU and was developed with the aim to be easy einzurichtbar and usable. IBM made the rather unusual decision, the motherboard and other electronics in the monitor to accommodate. The early models of 2011 and 2121 started the DOS from a ROM and showed at the beginning of a four-division graphic screen, direct access to help information, Microsoft Works, own software and the DOS command processor bot. It had 1 MB of RAM, a built- in 2400 baud modem, an optional 30 MB hard drive and an optional sound card. IBM also drove a 5.25 " floppy drive, and an Adapter Card Unit ( ACU) to accommodate expansion cards by third parties. Model 2121 used the same chassis as the 2011, but had an ISA expansion slot inside the case. The main memory was a proprietary 4 MB memory module from 2 MB to be extended to 6 MB.
The first PS/1-Modelle (2011, 2121, 2123 ) offered too little expansion opportunities, especially due to lack of ISA expansion slots.
A successor later had an Intel processor with 16 MHz 80386SX, a version with the Intel 80486SX ran at 20 MHz.
The models in 2133 can be divided into the following hardware categories ::
In May 1993, IBM introduced a " new generation" of PS/1-Produktlinie. These systems contain a normal LPX motherboard. Curiously, many of these later PS/1-Systeme were preloaded with MS -DOS and Microsoft Windows delivered instead with IBM 's PC- DOS or OS / 2 This was because IBM saw the market for OS / 2 in more expensive machines with more processing power. However, one of the first 2133 models had a pre-installed OS / 2 2.1.
End of production
The product line PS / 1 was set in 1994 and replaced by the Aptiva line, which resembled the last PS/1-Modellen of its architecture, but had a market the more common name. Aptivas were sold in the United States until the spring of 2000; then made the price pressure, the product line unprofitable and IBM withdrew completely from the PC consumer market back.