This was based on the blowit pascal source file from the blowit.pdf file,
only problem was it used a unit called VTD that was not included and
was impossible to find ANYWHERE! unfortunately it was quite important
as it did the delays - so I've rewritten parts of it so that it should
work ok on any computer BUT ONLY IN REAL DOS MODE. (no guarentees of course!)
it will NOT work under windows (unless you have no printers installed on
the LPT port, but I havent tried it...), use py2051 if you need that. It
has been written so it should work on any speed pc, I've tried it on a
PIII 850, and on a 16MHZ 286 and it worked on both. Also added support
for Intel hex files rather than binary files and made it able to program
the AT89C1051, 2051 and 4051. Feel free to change, reproduce or do anything
else that takes your fancy with it - I've also included the circuit diagram
and a simple board diagram in the zip file if you need it. Good luck...

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