Position among IBM's PC brands IBM PS/1

1 position among ibm s pc brands

1.1 models 2011 , 2121
1.2 model 2133
1.3 post- dos in rom models

position among ibm s pc brands

like pcjr, ps/1 s name suggested more limited machine ibm s business line, ps/2. however, unlike ps/2, ps/1 based upon architecture closer @ , compatibles, such using isa, plain vga, , ide. ps/1 line created new computer users , sold in consumer electronics stores alongside comparable offerings compaq, hewlett-packard, packard bell, , others. american ps/1 models came modem installed users access online ibm services, provided partnerships prodigy , quantum. although first models used custom-designed components , design, later desktop , tower models used standard components. earlier models included rom ibm s pc dos , graphical shell, system compatible other dos implementations , shell installed on hard drive. later models included feature called rapid resume gave computers ability go standby mode hibernation function. there several form factors used during ps/1 s production:

2011 proprietary design, power supply within crt
2121 proprietary design, power supply within crt, 2 available isa slots
2123 limited-production model. based on ibm ps/2 model 30 case, 3 available isa slots
2133 desktop case. 3x3 references available slots , drive bays.
2155 desktop case larger 2133. 5x5 references available slots , drive bays. including 5.25 bay.
2168 tower unit. 6x8 references available slots , bays. including 5.25 bays.

the 2133 , 2155 cases used in several model years 2168 tower unit appearing bit later.

models 2011 , 2121

the original ps/1 (model 2011), based on 10 mhz intel 80286 cpu, designed easy set , use. featured 512 kb or 1 mb of memory, built-in modem (american models only) , optional 30 mb hard disk. ibm released 5.25 disk drive unit, $169 isa adapter card unit (acu) install third-party expansion cards, , $995 cd-rom drive, based on western digital scsi chip, fit underneath case. of lower-end ps/1 models suffered limited expansion capabilities, since lacked standard isa expansion slots.

the 2121 series computers used same form factor 2011 series, included 2 isa slots inside case. memory expanded 2mb 6mb using proprietary 4 mb memory module. higher-end 2121 featured intel 80386sx processor running @ 16  or 20 mhz.

the 2121 series ps/1 computers can split following major hardware categories:

monitors ibm made decision put dc power supply in monitor, making use of third-party monitors difficult , impractical , limiting usefulness of computer if monitor needed service (similar problems of coleco adam , amstrad 1512 years earlier). models sold greyscale vga monitors. however, hobbyists manage remap pinouts allow third party monitors.

dos in rom similar few tandy 1000 models, 2011 , 2121 had operating system (pc dos 4.01) built rom, rather loading hard drive. rom disk load 4-quad screen allowed users access help, rapidly launch pre-installed software, connect online, , access files on hard drive. possible have computer boot hard drive if operating system upgraded, , ibm provided dos 6.22-compatible version of 4-quad program launched hard drive if users wished continue using it.

model 2133

the 2133 series ps/1 computers can split following major hardware categories:

post- dos in rom models

on may 11, 1993, ibm introduced new generation of ps/1 line. later ps/1s featured standard lpx-architecture motherboard. many of these later ps/1s shipped factory ms-dos , microsoft windows, rather ibm s pc dos or os/2. 2133 model did come preloaded os/2 2.1. because ibm targeted os/2 high-end computing machines more power.