What is IBM system board removal? you have real information about it?

To remove an IBM system board from its case,simply remove the two or three screws holding it in place after you have  removed all the expansion boards from their slots and disconnected all the wires plugged into the system board then slide the board about one inch to the left freeing the nylon fasterners from their channel.you should then be able to remove the
board from the case by lifting its left edge above the rim of the case and countinuing to slide it to the left. planar boards in ps/2s do not require the left shift when they are removed because they are simply held in place by their  mounting screws once you are removed the screws holding the planar down,you should be able to lift it free.

You know that what is "Physical Aspects" ?

In mainstream first generation IBM personal computers (that is the PC,XT and AT) motherboards fit one of three different  sizes each defined by the machine's initials.in the past,the motherboards of all PC's measured about 8 1/2 inches.the XT  strectched nearly an inch longer the AT in need of more space for more circuity extended all the way to 12 by 13 1/2 inches.lower priced commodity computers generally followed the same scheme allowing for board manufacturers and ase maker to offer compatible products,you can be sure that a clone of an XT motherboard will fit an XT clone case.IBM set the pattern compatible makers merely followed it.
Major compatible manufacturers -compaq Espon,leading edge,Tandy and so on control the manufacture of both system board and case they have the freedom to vary dimensions as may be required for example the original compaq portable motherboard was some what larger than that of the PC.

What is the "The display system of Computer" and how it works?

Every computer needs a display system .IBM designed one for its personal computer with experience won in the office  and in making computer terminals.it had to have sharp easy to read characters and no annoying flicker.experience with mainframe and the typical implementation of CP/M computers might have lead IBM to use so called teletype video where the computer sends characters to a terminal and the terminal then displays them.The terminal circuitry does most of  the worrying where text will appear on the screen.
apple however used a different techinque called character mapping a character mapped display is divided into a matrix of character position and each character position is assigned a memory location.The display system matches the character designation in the map with the dot-pattern of the character that is stored elsewhere in a font library(which can be either RAM or ROM) independently of the host micro processor the video system send the appropriate dot information from the font library to the screen.
The advantage of this arrangement is that it is fast and efficient from the microprocessor and memory point of view.it  needs to deal with only efficient character codes.only two kilobytes of data need to be moved or stored for a full 80-coloumn by 25 row screen of next.it also eliminates much of the cost of a terminal.making it work requries only a display essentially a picture tube and its control circuity -instead of a complete terminal.
IBM added an extra byte for each character of the display to hold at tribute information-whether the character was dim  highlighted under lined,or shown in reverse video on the screen.IBM also chose to put the character and attribute bytes  for each on screen cell adjacent to one another,using a total of four kilobytes of memory area.

Some information about Computer competitors..

To understand why particular elements were chosen for the design of the PC,you need to remember what was happening in the  small computer market place at the time. in 1980 terms personal computer was still evolving annd there was no lack of hardware choices.in fact most of the available
small computers could be divided into one of three major groups.Each to two of these were dominated by a single manufacturer. The other was unified by an operating system..
Well next time we sh are more information about this topic and than you will learn about more computer competitors and and if you have more information which you want share with us or you want to ask any thing from us than contact with us and we guide you more as well as..