On the basis of model

 We have following types on the basis of model

1.)XT computers

2) AT computers

3)PS/2 computers


Let's know in detail.

1.)XT computers



  1. has same features as of IBM except minor improvements

  2. used 8086/8088 microprocessor with speed 4.77 MHZ

  3. had one supporting co-processor(math)

  4. it had 128KB RAM, 10MB hard disk

  5. the operating system was DOS

  6. used programs concept stored in ROM

  7. for programming, BASICA was used

  8. many devices like keyboard,joystick, printer,floppy disk were used

  9. to enhance the video quality, video adapter was used. later it was changed to ‘enhanced graphics adapter

  10. gradually the input channel, RAm capacity  and others’ quality was improved.

2) AT computers



  1. used improved technology; so called advanced technology over XT.it was developed by IBM

  2. used 80286 microprocessor with speed 8MHZ

  3. the system board had 16-bit bus and 24-bit address bus

  4. it used 15 IRQ and 7 DMA channels

  5. used maximum memory 16MB

  6. input with 84-keyed board

  7. storing devices floppy of capacity 1.2MB, hard disk of 20MB were used

  8. was equipped with video cards

  9. used operating system DOS with an additional feature  of networking

  10. was available with physical lock system

just like XT, AT had also  supporting co-processor(math).

3)PS/2 computers



  1. next generation computer released by IBM to recapture the growing market in the field of pc

  2. it had complex architecture (microchannel) than XT and AT

  3. computers used Intel 286,386SX, 486 etc processors.

  4. had 8MHZ or faster speed

  5. primary memory as semiconductor with capacity 512K (72 pin system)

  6. secondary media as hard disk with capacity 20MB and floppy disk of capacity 720K to 1.44MB

  7. VGA was used for high resolution video and colours

  8. used with GUI operating system named OS/2 and UNIX in all its pcs

  9. inputs like keyboard having 101 keys and mouse were used in its interface.

  10. supported ‘plug n play’ architecture

  11. used BIOS based programs

  12. IBM also had developed same architecture based server for multiprocessing.

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