The Blow IT flashprogrammer is a parallel printer port based programmer and can only erase, and program a chip. The programmer works only with the AT89C1051 to AT89C4051 chips.
The programmer uses the same interface as the MCS Flashprogrammer, but doesn't support all the features due it's design. So for a description read the MCS Flashprogrammer help.
Not recommended for new programmers.