* Binary: 0 and 1 = on and off * Decimal: from the binary set of 8 number 128-64-32-16-8-4-2-1 and it's the sum of all the value. ex: 0 0 1 0 1 1 0 1 = 45 * Digital and analoge: insinde a PC it's digital (remember binary are numbers), like CDrom is digital and tape are analoge. Phone line is analoge, when it come from the modem, it's analoge and it's converted to digital in the PC and goes back to analoge in the modem. both are the language of computer. * Bit: is the smallest value that a PC can understand, it takes 8 bits to make one byte, and 1 bite to make one caracter (A) * Learn some code of ASCII (aski) that the value of decimal 48 = to the ASCII 0 and 49 = 1... and 57 = 9 and 65 = A and 66 = B and and 90 = Z and 97 = a and 122 = z (notice that some letter are lower case and some upper case) * input: mouse, microphone, keyboard * Processing: (CPU and chip set) * output: printer, monitor, speakers * input and output: hard drive, cdrom and cdr CDRR, floppy, zip drive * external connector: serial port: 9 pins or 25 pins (DB-25 or DB-9, many times used for a modem. also a 5 pin old keyboard connector, now they use either PS/2 or USB. Also a modem connection. Also VGA or SVGA video connector (15 pins). Parallel port connector, it's usually for printer, it's a 25 pins DB-25 but it's paralel, not serial, so 8 bits at the time, not only 1. and it's female on the PC. audio card, (it's input and output) microphone, speakers. Joystick connector. Network conector called twisted pair. * Cable: Parallel printer cable (DB-25 but paralell). Serial port cable, usually used for modem, it can be a 25 pins that goes to the modem and the 9 pins to the PC or the opposide, usually serial port are female on the PC. Also keep in mind that there is a 5 pins old keyboard cable extention. Also serial port cable converter from 9 pins to 25 pins and vice verca. Also PS/2 to a serial 9 pins. Regular 5 pins cable to PS/2 converter. USB to PS/2 converter. USB cable, remember that the end of the PC is different that the one on the device. USB have 4 cable in, 2 for power and 2 for data. Also fire wire, it needs it's own power. Cable insinde are not as sheild because there is not as much static and noise ouside of a box. * INSIDE cable: IDE cable, 40 pins, SCSII cable, same as IDE but wider a bit. Floppy cable, note that they are twisted, it's suppose to define wich one is the first floppy and wich one is the second. ALSO the cable that goes from the CDROM to the sound card audio. Molix cable it what connects the power, from the power supply to the hard drive floppy...There is also a mini plug, if you have too many drive, there is a converter from molix to mini and it can supply the floppy. * Electricity: AC= alternative current, it's from the wall. DC= is direct current, small amount of power. Voltage = pressure, the resistence is something that control the amount of power, resist the amount of power. and what is out of that, is the wattage (watt) it's the result that we are producing. Also power supply takes the raw ower from the wall and convert it in the amount of watt that the PC needs. Multimeaters is a device to calculate the amount of voltage or watts. Also a wrist protector will make sure that we don't have any static in our body, it discharges us. The power supplys should send 5 volts to the mother boards, 5 to 10 % mistake. To the the other device should be 12 volts. 5 to 10% mistake. * Security device: wrist protector (electrostatic discharge). Working with a electrostatic discharge matress. (work mat) Never open a power supply, they should be like disposable. Fire instinguisher. * System protection: Power surge protectors, it may help in case of bad surge. UPS is like a power surge but it has a baterry, should be changed every year. This is too avoid a "spike" to avoid damaging the PC and in some case the power supply it self. But a direct litening from a thunderstorm, nothing will help, we should unplug completly the PC. * Tools part 1: Can of air to clean dust. Note pad. screw driver, philips and flat but now we have torks. A file.