Technical information
Micro-KIM Users Manual
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Before you begin your adventure in building your Micro-KIM, make sure you have plenty of room to work
with. You will need the following tools to assemble your kit:
• Soldering iron with solder
• Needle-nose pliers
• Wire cutters
• Multi meter or Volt meter
• 7.5V power supply with 2.1mm connector with positive center connection
• Magnifying glass is optional and used to better inspect solder points
The first components to start with are the resistors. By installing these first, this will insure that the resistors will
be flat down on the board. They are not polarized so there is no incorrect way to install them. Here is the list of
the resistors and their color codes. See page 9 figure 4 for a more complete explanation of the color code chart:
There are 7 100 ohm resistors labeled brown black brown
There are 11 220 ohm resistors labeled red red brown
There are 16 1K ohm resistors labeled brown black red
There are 7 3.3K ohm resistors labeled orange orange red
There are 2 47K ohm resistors labeled yellow violet orange
Place each resistor through the holes and bend the leads outward just a little to hold in place. After you have the
resistors in the board, flip the board over and solder the leads. After you have soldered the leads, you can use
the wire cutters to trim as much of the excess lead off as possible without removing any solder.
The next component type to install is the diodes. D1 is a 1N4001 and is a black diode with a white stripe. This
is a polarized component. Match the stripe on the diode with the stripe on the Printed circuit board (PCB). If
this is installed incorrectly, the serial port will not function.
D2 is a 1N4148 and is a little smaller than D1 and is clear with a small black stripe. Match the black stripe with
the stripe on the PCB. Once again, if the diode is installed backwards, the serial port may not function.
The next component to install is the 23 keypad buttons. You can install these one at a time, or all at once with a
simple trick. Find a board or a piece of metal that is very thin but strong. Place all of the buttons into the PCB.
There is only one way they can be installed so you can not install them incorrectly. Next, place the piece of
wood or metal on top of the PCB. Here you can either add a rubber band to hold the two together or just flip the
two over holding them together. Set the PCB on your workbench and make sure the switches are pushed all the
way into the PCB before soldering them in place.
Install the 4.7K resistor pack that is just below the 6502 CPU. Pin one on the PCB is next to the 4.7K label on
the PCB. Pin 1 on the pack has a small dot above it. Do not install this component backward.
Next install the power on/off switch. It is a small slide switch with 5 posts on the bottom and is metal cased.