These are simple AVR programmers. I designed and built four different programmers for various envilonments: LPT controlled parallel programmer, LPT controlled ISP adapter, COM controlled ISP adapter and COM controlled generic SPI bridge. Additionaly, COM controlled adapters can be used as a communication cable between host PC and target board, it is useful for debugging.
These AVR programmers have no controller on the programmer and directly controlled with port signals. Therefore, programming time is reduced shorter than any other programmers because there is not any communication delay such as command/result sequense between PC and programmer. These programmer can also be used with AVR studio :-).
If you have a JTAG download cable controlled via LPT port for Xilinx, Lattice or Altera devices, it can also be used to program AVR.
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