I’ve attached PIC assembler code to initialize and display using the 64 by 128 pixel AdaFruit 250 GLCD that costs $17.95
The software is for an 8-bit PIC. My example uses a 16F88. The SSP module sends data and instructions to the GLCD in the background. No other PIC modules are required.
The GLCD requires low voltage so the PIC operates and is programmed using low voltage protocol.
Additional comments are at the bottom of the assembler file. The file opens in a “pretty” format with Microsoft Notepad
I wanted to use an 8-bit PIC with assembler. Most applications use C. My application is a 64 x 32 cell of Conway's Game of Life using a 16F88, also in assembler.