Here is a simple programmer circuit which uses the PC parallel port to burn the 89s series chips.
It can program almost all AT89S series microcontrollers.
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Circuit Diagram:
Top side of the Board
Bottom side of the Board
Parallel port connector
PC parallel port
Burning software
8051 Simple 89S series programmer using parallel port 1.0
Program 89S series microcontrollers using this ISP prorammer