Technical information

Micro-KIM Users Manual
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If you have just built your Micro-KIM or have been using it for some time and are now having problems, there
are a few simple things you can check. Here is a small list of possible problems and fixes. Your problem may
not be on the list. If you can not get your Micro-KIM working, contact Briel Computers for more help. Our
goal is that every Micro-KIM shipped works.
Problem Possible solution
Dead, nothing on display
Check JP2 and make sure it is off and JP1 is on. When Micro-KIM is first
powered up check that RS is pressed to reset circuit. Make sure all IC’s are
fully seated in the sockets. Verify that power is coming into the Micro-
KIM. Check that VCC is at least 4V by checking pin 28 of the EPROM or
RAM or pin 14 or 16 on most of the TTL chips. Check 1MHz signal at pin
37 of 6502 to verify that system clock is working.
Keyboard doesn’t work
Check JP2 and make sure it is removed. Check 6532 and 74LS145 just
below 7-segment displays and make sure it is seated properly.
Only one digit is displayed and
it is really bright
This is normal when display is not multiplexing. This can happen if you
step through the monitor. Press RS to reset system. Display should return
to normal. If not, verify all IC’s are properly seated in their sockets.
Voltage regulator is very warm
The voltage regulator drops voltage down to TTL (5V) level from your
input level. The higher the input level, the hotter the voltage regulator will
get. Do not put more than 9V DC into the Micro-KIM or it could cause the
Micro-KIM to overheat. Recommended input voltage is 7.5V
Nothing happens in
HyperTerminal
Make sure you are using a standard DB9 Male/Female cable. Check your
settings in HyperTerminal. Check that JP2 is on to enable RS232 and
disable onboard display/keypad. Verify correct COM port is selected in
HyperTerminal.
USB to Serial not working
Verify that the drivers are installed properly. Make sure correct COM port
is selected in HyperTerminal
If this list of problems and solutions does not help you, feel free to email Briel Computers to help resolve any
problems with your Micro-KIM.