Hi Skip. The DOS executable is here: http://www.cnunix.com/ftp/hamradio/tapr/software_lib/utils/7plus20.exe
The source code is here: ftp://sunsite.unc.edu/pub/Linux/apps/ham/7pl217sr.tgz 7plus is available as installation package in some Linux distributions. I was maintaining 7plus installation package and other HAM applications for SuSE Linux in Prague when I was a student. There is one neat thing about 7plus. 7plus files have standard header and tail. The packet radio modems often snipped out the 7plus sections from their RX window and stored them into appropriate files. Some applications even executed the 7plus utility to decompress the data when all pieces were received. There were even programs, that extracted 7plus files from monitor. This allowed for multicasting, if the link quality was good. 73, Vojtech --- In digitalradio@yahoogroups.com, kh6ty <kh...@...> wrote: > > That's neat, Vojtech. Is there a link to download 7plus? WRAP only > calculates a checksum for the entire file, and if it will not "unwrap", > we just resend the whole file. > > 73, Skip KH6TY > > > Vojtech Bubnik wrote: > > > > > > > so we developed the Wrap program, which sends a checksum at the end > > > of the message, and error-free reception can be verified that way. > > > > Hi Skip. > > > > >From the Packet Radio times, we have a 7plus utility, which splits a > > longer binary file to multiple parts and adds mild error detection / > > correction codes. After you receive all parts and run them through > > 7plus, if there are errors, the application will generate a "request" > > message, which will identify missing parts to be repeated. > > > > 73, Vojtech AB2ZA > > > > > > -- > *Skip KH6TY* > http://KH6TY.home.comcast.net >
