Assuming you have the in-box maximum of 16K words, there are not a lot of software options available. HPBASIC is one option, if you have a 'microcircuit interface' board, I can send you a few programmed chips that will get you booting with very little work. Another option is OCTAPUS-C, a tiny, very limited in-line assembler and disassembler / monitor program. There are also stripped-down builds of HP-IPL/OS that will run on a 2116. Gary Sloane wrote: