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DO I NEED A POWER SUPPLY MODULE?1. IntroductionThe design of the ISA bus places a number of voltages in the bus connector. An ISA card may use one, multiple or all of the voltages provided . As a minimum’ all of the ISA cards use +5V power. Depending on the functions of the card and the way they are realized, the ISA card may use other voltages as well.This article will give you a practical way of recognizing what voltages an ISA card is uses and what is necessary to make the ISA card function through USB on one of the USB2ISA family of cards. 2. Voltages on the ISA busThere are the four voltages provided for use on the ISA bus: +5V , -5V , +12V , -12V.An ISA card always uses +5V. The ISA card may not use other voltages or it may use one or more of the three other voltages. 
The ISA card above has golden pads, as seen at the bottom of the image. Some of the pads are covered in gold some are not. The ISA bus consists of two parts- the 8bit portion (the long part- on the lower left-hand side) and the 16bit portion (the smaller portion- on the lower right-hand side) . The power supplying pins are located on the 8bit portion, starting from the down / left to right : and the additional voltages to pay attention to are : pin5 = -5V, pin7 = -12V, pin 9 = +12V. 3. Examples3.1. ISA I/O card - need of +12V and -12VThe ISA card in the picture below is an I/O card with a floppy disk, a hard disk controller, a parallel port and two serial ports. Going through the pins reveal that pin5 is not connected/used. But pin7 = -12V , and pin9 = +12V are connected/used in this ISA card. There are thick lines going up to the circuit board . This ISA card may be used on USB2ISA type cards with an additional POWER SUPPLY MODULE if the consumed currents are less than the maximum allowed. 3.2. ISA network card - no need of additional powerThe ISA card below is a network card.
Some of the pads are missing but the position they are located in have to be counted. Pins 5,7 and 9 are all missing. This ISA card does not on need an additional power and may be used directly on USB2ISA type cards with the power provide by the USB CABLE . 3.3. ISA VGA card - need of -12VThe ISA card on the picture below is a VGA card.
Some of the pads are missing but the position they are in have to be counted. Pins 5 and 9 are missing, but pins7 = -12V is used/connected. This ISA card may be used on USB2ISA type cards with an additional POWER SUPPLY MODULE, if the consumed currents are less than the maximum allowed. |
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