From Wikipedia, the free encyclopedia IBM PS/1
IBM PS/1
IBM PS/1 (model 2155)
Type Personal computer
Operating system IBM-DOS / Windows 3.1
CPU Intel 80486SX @ 25 MHz
Memory 2 MB ~ 6 MB
The IBM PS/1 was a brand for a line of personal comput-
ers and was IBM’s return to the home market in 1990, five
years after the IBM PCjr. It was replaced by the IBM Apti-
va in September 1994.
Position in IBM’s PC brands
Like the PCjr, the PS/1’s name suggested a more limited
An IBM Personal System 1 model 2011 machine than IBM’s business line, the PS/2. However, un-
like the PS/2, the PS/1 was based upon architecture clos-
IBM PS/1 (model 2011) er to the AT and compatibles, such as using ISA, plain
Type Personal computer VGA, and IDE. The PS/1 line was created for new com-
puter users and was sold in consumer electronics stores
Release date 1990
alongside comparable offerings from Compaq, Hewlett-
Operating system PC-DOS 4.01 (in ROM) Packard, Packard Bell, and others. All PS/1 models came
with a modem installed so users could access online IBM
CPU Intel 80286 @ 10 MHz
help services, which were provided by partnerships with
Memory 512 KB ~ 1 MB Prodigy and Quantum. Although the first models used
custom designed components and design, later desktop
IBM PS/1 (model 2121) and tower models used mostly standard components.
Type Personal computer The earlier models included a ROM with IBM’s PC-DOS
and a graphical shell, however the system was compati-
Release date 1992
ble with other DOS implementations and the shell could
Discontinued 1993 be installed on the hard-drive. Later models included a
Operating system PC-DOS 4.01 in ROM) feature called "Rapid Resume" which gave the computers
the ability to go into standby mode as well as a hiberna-
CPU Intel 80386SX @ 16 MHz tion function. There were several form factors used dur-
Memory 2 MB ~ 6 MB ing the PS/1’s production:
• 2011 Proprietary design, power supply is within CRT
IBM PS/1 (model 2133) • 2121 Proprietary design, power supply is within CRT,
Type Personal computer up to two available ISA slots
• 2123 Limited production model. Based on IBM PS/2
Release date 1992
model 30 case.
Discontinued 1993 • 2133 Desktop case. The 3x3 references the available
slots and drive bays.
Operating PC-DOS 4.01
system • 2155 Desktop case larger than 2133. The 5x5
references the available slots and drive bays.
CPU Intel 80386SX @ 25 MHz or 80486SX @ 20 • 2168 Tower unit. The 6x8 references the available
MHz or 80486SX @ 25 MHz
slots and bays.
Memory 2 MB ~ 16 MB (2-4MB on-board) The 2133 and 2155 cases were used in several model years
with the 2168 tower unit appearing a bit later.
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From Wikipedia, the free encyclopedia IBM PS/1
Model MB FRU CPU RAM VRAM SIMM Hard-Drive
2133-?11 93F2397 Intel 80386sx @ 25 MHz 2 MB 256KB 2x72 Pin FPM 59G9567 (85 MB IDE)
2133-?13 93F2397 Intel 80386sx @ 25 MHz 2 MB 256KB 2x72 Pin FPM 93F2329 (129 MB IDE)
2133-?43 34G1885 Intel 80486sx @ 20 MHz 4 MB 512KB 2x30 Pin FPM 93F2329 (129 MB IDE)
2133-?50 34G1848 Intel 80486sx @ 25 MHz 4 MB 512KB 2x30 Pin FPM 93F2329 (129 MB IDE)
2133-?53 34G1848 Intel 80486sx @ 25 MHz 4 MB 512KB 2x30 Pin FPM 93F2329 (129 MB IDE)
Preceded by IBM Personal Computers Succeeded by
IBM PCjr IBM Aptiva
Models 2011 and 2121 ly 2133 model did come preloaded with OS/2 2.1. This was
because IBM targeted OS/2 for high-end computing ma-
The original PS/1, based on a 10 MHz Intel 80286 CPU,
chines with more power.
was designed to be easy to set up and use. It featured 1
MB of memory, built-in modem, an optional 30 MB hard
disk. IBM also released a 5.25" disk drive unit and an Discontinuation
Adapter Card Unit (ACU) to install third-party expansion
The PS/1 line was discontinued in 1994 and replaced with
cards. Some of the lower end PS/1 models suffered from
the Aptiva line, which was architecturally very similar to
very limited expansion capabilities, since they lacked
the later models of the PS/1, but with a more marketing-
standard ISA expansion slots.
friendly name. Aptivas were sold in the United States un-
The 2121 series computers used the same form factor
til early 2000, when price pressures made the line unprof-
as the 2011 series, but included up to two ISA slots inside
itable and IBM withdrew from the retail desktop PC mar-
the case. Memory could be expanded from 2MiB to 6MiB
ket entirely.
using a proprietary 4 MiB memory module. The higher-
end 2121 featured an Intel 80386SX processor running at
16 MHz. Similar to a few Tandy 1000 models, the early See also
PS/1’s had an operating system (PC-DOS 4.01) built in to • IBM PC
ROM, rather than loading it from a hard drive. It was pos- • IBM PC compatible (IBM PC clone)
sible to have the computer boot from the hard drive if the • List of IBM products
operating system was upgraded. • PS/2
Monitors IBM made the decision to put the DC power • ThinkPad
supply in the monitor, making use of third-party moni- • ThinkCentre
tors difficult and essentially impractical and limiting the • IBM Aptiva
usefulness of the computer if the monitor needed service
(similar to the problems of the Coleco Adam years earli-
er). Some models were sold with greyscale VGA monitors. References
"DOS in ROM" The early 2011 and 2121 series would [1] "PS/1 - 2133 18A/21C/23C/52D (SL-B) Service
boot up off the DOS in ROM and load a "4-quad" screen parts". IBM. 1999-03-08.
which allowed users to access help, rapidly launch pre- http://ps-2.kev009.com:8081/pcpartnerinfo/
installed software, connect online, and access files on the ctstips/50fa.htm. Retrieved 2008-06-14.
hard drive. [2] Hardware Maintenance Service for PS1 computer
(Machine Types 2133, 2155, and 2168). IBM
Model 2133 Corporation. March 1993. 63G2028 .
The 2133 series PS/1 computers can be split into the fol-
lowing major hardware categories[1][2]:
External links
Post "DOS in ROM" models • IBM Archives: IBM PS/1
On May 11, 1993 IBM introduced a "new generation" of
the PS/1 line.[1] Later PS/1s featured standard LPX-ar-
chitecture motherboard. Many of these later PS/1s
shipped from the factory with MS-DOS and Microsoft
Windows, rather than IBM’s PC-DOS and/or OS/2. An ear-
Retrieved from "http://en.wikipedia.org/w/index.php?title=IBM_PS/1&oldid=417503341"
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From Wikipedia, the free encyclopedia IBM PS/1
Categories:
• IBM personal computers
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