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I already mentioned that display is HDM128SG24L made by Hartronix.
It has 8k RAM.
As I couldn't use "glcd_clr" function because of those unknown arguments I just wrote my own function to c ...

Thank you very much. But it looks like you thinking my display is not working. No, it is working, I can put text in right place and draw line, rectangle, box etc.

What does not working I show in th ...

I have both GLCD and Data Sheet from MPJA. On the back of board I see 3 IC for 80 column each module. And 2 for rows. It is normal for this display. Only way to see single scan or dual is to check a l ...

Thanks for your replies.
CharPerScn: If about text characters it should be qty of 480 (30 ch x 16 ln). If speak about bytes it must be 3840.
I didn't see that HDM128GS24 has more than 1 screen.
I ...

I'm working with 240x128 GLCD. Driver is like this: http://www.ccsinfo.com/forum/viewtopic.php?t=31255&highlight=t6963c
My question is about usage of function glcd_clr(location, size).
// - - - ...

#include <16F877A.H>
#fuses XT, NOPROTECT, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=20000000)

For 20 MHz fuse should be set to HS. See page 146 of PIC16F87xA Data Sheet.

using 220pf cap and 20MHZ crystal

Do you use 220pF with 20 MHz crystal? Better to try 22pF instead.

Hope it will help.