Does anyone have idea for how to drive the original LCD display inside the comm box? Hook them up to FS?Is it a possible task? If yes, what is the possible way to interface it?http://alkit.fotopic.net/c338611.htmlregards,Alkitwww.alkit.nethttp://alkit.fotopic.net

Yes BTW you have a lot of guts ie thats lots of work....1. you will have to remove the circit bords, etc.2. remove the leds, now printed on them should be a part number not the Boeing #, but the led manufauter.3. contact the manufacture for pin-outs ect. 4. if they are hp hex/alpha leds its cake..4a. wire them in parrell that is the data. 4b. wire the lamp test function to one point (if it has one.)4c. wire each of the strobes to a decoder 4 inputs 16 outputs 4d. wire the four or eight data lines to latch.4e. wire the four decoder data line to a latch. __ __ __ __| | | | | | | | | |==| |===| |===| |======[data latch]========= 8 bit data to comp. -- -- -- -- || | | | | / ------ || | | -------==========| | || ------========================| |======== ------/so.. that about it..some led have there own latches.. so you have to write data & decoder at the same time. well any way you will need to pick up a IC data book at the least to get the timming down.. but it should be no problems..the other way to write them is two use two ports one data & the other goes to the led strobe.. that way you dont need the decoder...hope this helps..www.phoenixcomm.net/~phnx2000/sim

@phoenixcomm:Alkit said they were LCDs not LED displays.@Alkit:its not impossible, but might get messy :)As suggested by phoenixcomm, try to find out about the display as much as you can.If it has a "somewhat intelligent" interface, it might be possible if the specs for the interface are available.If all else fails, you could interface each of the segments directly as if it were a bare 7segment LCD (like in thermometers, multimeters,...)Look up these three 4000series CMOS ICs:4054 4055 4056The datasheets often have application notes that show how they can be used.Manuel

not possible to replace the LCD's with some you get yourself & interface trough PHCC ?

>not possible to replace the LCD's with some you get yourself>& interface trough PHCC ?Well, I think the idea is to keep it as original as possible and since this is hardware from a real aircraft, it would otherwise be a "waste" of that nice real LCD.The Problem with "bare" lcds is that you can't just apply logic level voltages to the segment data lines and it'll work. LCDs need to have the voltage reversed (inverted) continously to remain 'visibly on'. Otherwise the segments will "decay". Thats what those three ICs would take care of.Their inputs (in BCD, 4bit) could be driven by PHCC and some others.(Another chip that could be used as well is the 4543)Manuel