Do give up on assembler code for operating a graphics display. However if you want to you could compile code with a C compiler like Keil (which you can get free access to if you use the SiLabs Simplicity Studio) and then take the assembly language from the listing file and edit it to suit your fancy.

I have shared sample GLCD code at my web site at:

http://www.carousel-design.com/GraphLCD.html

Michael Karas