hi I need to know whether a usb to db-9 converter can be connected with a serial port programmer for programming at89s52..?
Having built the programmer you perhaps have more insight into this than most. So what exactly can you tell us about the design/construction of your device, and the software/settings you are using to drive it?
Exactly - and so you should be able to answer my earlier questions yourself:
Does it use the RS232 purely for communication, or does it rely upon some clever bit-banging on the control lines?