I had a backup on a Jaz drive, enough said. The problem is that this is one of the cases where I lost the source code. This apparently rekindled some interest in these old HP calculators, and someone asked him about HPDS (HP Development System), an assembler for the HP-48 that I had written way back then. The 1990s are calling, they want their development tools back The books are about the HP Saturn-based calculators, like the HP-48. A friend of mine, Paul Courbis, has recently re-published old books of his on Amazon.
