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Using the 8 pin 12F1840, there is no possibility to show data on a LCD screen (to less pins available). I use RS232 to another microchip with more pins and a LCD screen to show data, especially during testing of the system(s).
However, using two microchips, needs also an easy way to program them. I used the In-Circuit Serial Programming (ICSP) with master EB006 board. But programming two microchips made me to change many times the ICSP to the other board. This made me to make a masterswitch to change the ICSP to one of the two boards (the middle one of the picture) and 2 additional switches to change from programming mode to the working mode (on-mode) of the microchips (shown on the picture by P and On in blue).
They Vpp, Vcc, GND B6 (Clk) and B7(Data) are taken from the J5 pins of the board EB-006. The Switch for the 2 board disconnects the MCLR, Vcc, B6 and B7 and connects to the ICSP of the EB-006 board. GND signals are all connected.

Jan Lichtenbelt

Ref:
1) Remote speed control for DC Motors http://www.matrixmultimedia.com/article.php?a=677
2) Bread board for 18 pins microcontroller http://www.matrixmultimedia.com/mmforum ... t=+18+pins