Pesoalcomputes are micro-computes for general-purpose computations. These are classified as PC, PC/ XT, PC/AT, and super AT (or super micro )based on their cost and configuration. All these types contain a CPU.RAM.ROM.CRT display, Keyboard, and secondary memory,

Features:

 PC is the simplest and cheapest type of computer is used an  INTEL 8088(miroProceso chip) as CPU,64OKB, RAM 8KB ROM( ROM can be extended up to 64KB), and floppy disk as secondary memory processing speed of a PC lies in the range 1.5 MIPS( micro-instructions per second)

 PC/XT(Personal computer advanced technology) contains. intel 80286 as CPU, 640 Kb floppy disk drives(360/1.2MB) intel 8088 CPU, 64O KB RAM expandable to 4 MB, 64 kb from expandable 8 KB ROM. This is costlier than a PC because of the hard disk it contains. pc/xt is a single-user system. The processing speed of a PC lies in the range1-5 MIPS and hard disk capacity lies in the range of 20-80 MB.

 PC/AT(Personal computer advanced technology) contains. Intel 80286 as CPU, 640 KB RAM (expandable 4MB),64KB ROM(expandable to 128KB), hard disk drive, and floppy disk drive(360KB/1.2 MB, is CPU is powerful than the CPU of PC/XT and four to five terminals can be connected to it to make it multiuser. The processing speed of PC/AT lies in the range of 1-5 MIPS and hard disk capacities in the range of 20-80 MB.

 Super AT(or supermicros) uses a 32-bit CPU, intl 80386 & 80486. The RAM capacity of super macros lies in the range of 2-8MB in 80386 CPU can be extended upto32 MB and in case of 80486 up to 64 MB. The hard disk capacity lies in the range 20-80 MB. The processor speed of 80386 CPU lies in the range 3-5 MIPS and that of 80486 CPU is 12 MIPS to 25 MHz clock UNIX is used as an opening system.

 The processing speed of home computers and microcomputers for industrial control is less than 1 MIPS. Home computers are used for entertainment, basic education and home man,agerement and income tax calculation, and investment analyses.