Description: For the master IC with 40 pins, it s 89C51
There are also com-port and 7805 as you can see the footprint
Stuff of 4-pins button is for the hex keypad
Resister pull-up and led can easily be recognized by their footprint
I lost my schematic for a time. So sorry for that inconvenience
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File list (Check if you may need any files):
Code.ASM
Layout.MAX
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