from
The Free On-line Dictionary of Computing (8 July 2008)
HPL
Language used in HP9825A/S/T "Desktop Calculators", 1978(?)
and ported to the early Series 200 family (9826 and 9836,
68000). Fairly simple and standard, but with extensive I/O
support for data acquisition and control (BCD, Serial, 16 bit
custom and {IEEE 488} interfaces), including interrupt
handling. Currently owned by Structured Software Systems.
"HPL Operating Manual for Series 200, Models 216, 226 and
235\6", HP 98614-90010, Jan 1984.