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Z80 Examples for KS0108 and HD61202 Based Graphics LCDs

Examples presented here require that the KS0108 controlled 128*64 LCD is connected to an
8255 with base address of 00h.
Routines sendcomA & sendcom & sendcharA & sendchar have been tested on
The Z80 was clocked at 2 MHz

Geocities does not allow uploading files with .asm, .dat, .hex and .lst extensions. So, in order to make them viewable on line, I saved asm files as html documents and code listings as text files.

Connections:
LCD data bus(pins #14-#7) connected to Port A of an 8255 with 00h base address
LCD Enable pin(#6) connected to Port C bit #7 of the 8255
LCD R/W pin(#5) connected to Port C bit #6 of the 8255
LCD RS pin(#4) connected to Port C bit #5 of the 8255
CSA Chip selection driver 1 connected to Port C bit #4 of the 8255
CSB Chip selection driver 2 connected to Port C bit #3 of the 8255

Example #1 :
This program will display this bitmap on the LCD.
Source : graphic1.asm
List : graphic1.lst
Both of the files above + the hex file: graphic1.zip
Example #2 :
 This program will display this bitmap on the LCD using the easy but inefficient method mentioned on the Graphics How To page. Also, the source of this example has a routine to clear the LCD. Since the DDRAM may have random data after power up, it is a good idea to clear the display.

Source: non_effic_gfx.asm
List: non_effic_gfx.lst
Both of the files above + the hex file:non_effic_gfx.zip
Here is how to prepare the image and extract image data from it to be used in this example :

Step 1:
Rotate the image 90 degrees counterclockwise 		Step 2:
Mirror the image		 Step 3:
Make the image negative. Fire your hex editor. Remove the 62-byte-header and paste image data into your binary file.

Example #3 :
text