HP49-50G: gallonUK conversion into l

[brouhaha]

I thought it might have come from the HP-41C Petroleum Fluids Pac, in which space was at a premium and they might have truncated some contants. According to the manual for that, it uses 4.546087, so it's unclear what reference they used for that.

Back in the day, I bought the Petroleum Fluids Pac specifically for the Unit Management System (microcode functions CON and INCON); I didn't need anything actually petroleum related. The Unit Management System, supporting fewer units, was also present in the Machine Design Pac and the Thermal & Transport Science Pac. In 2009 there was a forum thread comparing them.

See the Pac manuals for details of using the Unit Management System functions. Further background and technical information on the Unit Management System may be found in two PPC Conference Proceedings:

PPC East Coast Conference, Rockville, Mayrland, 28 March 1981, pp. 2-1 ff.
PPC Northwest Conference, Corvallis, Oriegon, August 22, 1981, pp. 11-16

These conference proceedings are both available in "CD4" of Jake Schwartz' PPC Caluclator Archive.