at89s51 programmer for laptop

I an a newbie so please tell me how to program At89s51 chip using ISP. I will use laptop and so I do not have parallel port.
I have searched a lot on the Internet , but either I got a 404 or it uses a DB25. Will a USB-DB25 converter cable will work?
Thanks

popular programmers these days are USB . you will find a lot of them

arjob said:

I an a newbie so please tell me how to program At89s51 chip using ISP. I will use laptop and so I do not have parallel port.
I have searched a lot on the Internet , but either I got a 404 or it uses a DB25. Will a USB-DB25 converter cable will work?
Thanks

Click to expand...

My advice if you want to work in electronics field, better get RS232 and LPT ports with expansion cards for your laptop, or make USB programmer, such as USBasp (special edition of USBasp support 89Sxx). Also dont mix 89C with 89S in content of In-System Programmable (ISP) support.

https://www.circuitvalley.com/2011/06/usb-8051-avr-microcontroller-programmer.html

If you already have working USBasp just change firmware.

I guess, I will buy a USB programmer..Oh I so wanted to build the programmer myself.
Thanks.

arjob said:

I guess, I will buy a USB programmer..Oh I so wanted to build the programmer myself.
Thanks.

Click to expand...

You can try to make USBasp by yourself, this can be good practice for you. But you need to program ATMega48 programmer controller, for this you must use other programmer or you can make simple RS232 programmer with few resistors. Because you dont have RS232 on laptop you must finish this one time programming on some other PC with available RS232 port.


When you make USBasp programmer, put firmware from post #3 link inside uC, and use software given in Post #3 link ProgISP 1.68.

https://www.fischl.de/usbasp/

I can get USB to RS232 cable. Will it work?
Is there any good serial programmer schematic?

This version of USBasp programmer with support 89Sxx uC for firmware uC use ATMega8 and fuse bit configration are :

ATMega8

HFUSE=0xC9 LFUSE=0xEF

arjob said:

I can get USB to RS232 cable. Will it work?
Is there any good serial programmer schematic?

Click to expand...

With USB converter you never know what will happen, you must try to see.


You can try this serial programmer :



https://electronics-diy.com/avr_programmer.php

Software is PonyProg, link is here .


Example of connecting ATMega8 to programmer :