Special thanks to Rob Cowell of Design IT for taking the time to locate the sources, and agreeing to them being published. 
This is EtherH 4.52, the last public release. 
Only changes
 - makefile now creates empty dirs (to avoid importing empty dirs into CVS)
 - local copies of Hdr: removed, assembler files point to exported central copies
Builds but not tested. 26 bit only.