Trend Paper Tape Reader - PC printer port interface
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Several people have expressed an interest in this design, not I guess
because they want to read paper tape on their PC, but because it shows
how to read an 8 bit value in over a normal (unidirectional) printer
port using a multiplexer chip.

Well, here it is. There are 3 files for this project.

PTR_ITF.TXT is the ascii-art schematic for the interface. The bit
round the 74LS157 is the part used for reading 8 bit values. The
rest of the logic is to control the start/stop line of the Trend
reader, and can be ignored, I guess.

PTR.PAS is a turbopascal unit to operate the interface. The comments in
this file should indicate how it works.

PTRASC.PAS is the program for reading ascii paper tapes into the PC. It
is included for completeness, and is probably of little use for anything
else. Still, there might be somebody else who needs to solve the
same problem

You are welcome to distribute these files freely, put them on ftp sites,
etc. Just don't use them for commercial gain.

-tony
ard@p850ug1.demon.co.uk
