I have managed to locate the programmer manual for Espon Stylus 800
at the following URL:

http://support.epson.com/hardware/...ation.html

Since my office have that printer, so I will just try out that first and see how things go from there. Since I do not have a 8052 debugger or emulator, I try to program my parallel port to control the printer instead of using a 8052. After that, it's easier for me to port to 8052 in assembly.

However, the program still did not work at all. Sigh.......:(
The following is my code :

#include <stdio.h>
#include <string.h>

#define BASE 0x378
#define data BASE // SPP Data
#define status BASE+1 // SPP Status
#define control BASE+2 // SPP Control

#define NULL 0 // Null Character
#define ESC 27 // Escape key
#define LF 10 // Line Feed
#define FF 12 // Form Feed
#define CR 13 // Crash Return

void send (unsigned char);

void main () {

unsigned char message[] = "This is Andy working hard on this printer !", counter;

outportb(control, 0x00); // Init all control signal

send(ESC);
send('@'); // Init printer code

for (counter = 0; counter < strlen(message); counter++)
send(message[counter]);

send(CR); // Crash Return
send(LF); // Line Feed
send(FF); // Purge out the page
send(ESC);
// Reset the printer once more
send('@');
}

void send (unsigned char content)
{
outportb(data, content); // Float data on bus
outportb(control, 0x01); //Assert the active low STROBE Signal
outprotb(control, 0x00); //DE-assert active low STROBE signal
}