Geocities does not allow
uploading files with .asm, .dat, .hex and .lst extensions. So,
I saved asm files as html documents and code listings as text
here require a 2*16 LCD connected to an 8255 with base address
Routines sendcomA & sendcom & sendcharA & sendchar
have been tested on
>> 2*16 Hitachi LCD with HD44780 chip
>> Samsung 1*16 LCD with a KS0062F00 chip
>> 2*16 Epson LCD marked P300020400 SANTIS 1 ,and
>> noname 1*16 HD44780 based LCD.
The Z80 was clocked at 2 MHz and 4,9152 MHz for each display.
This was done
because the routines mentioned above take many t states, and in
that will be longer that the time a HD44780 will need to execute
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
#1: Print "Hello World !!!!"
on LCD screen