LCD 128x64 / GDM12854H, 16F877A

[JCasals]

Dear All,

I was trying to use a Matrix LCD 128x 64 (GDM12864H) as shown in this post. Checked all the conections, checked the Delay_cycle, tried different orders in the programming, everything looks OK. The RS232 is working but no image in the screen. The Hex file I also tried it in the ISIS and it works OK.
The only detail is that I have a 4MHz crystal instead of the 20Mhz but it does work in the ISIS, so should I change the crystal, change the 16F877A to a 18F4550 or what ?

Any ideas ? Thanks in advance.

Detail
PIC 16F877A
Graphics.c
HDM64GS12.c
Clock= 4M

[PCM programmer]

Post your #fuses, #use delay(), and compiler version.