Franck Zibi's first chess program written in HP Saturn assembly  for the HP 48 series of Graphing calculators with its 131×64 pixel LCD, released in 1995. With 50 to 100 nodes per second, HpChess is a slow program and therefore uses static exchange evaluators with pin detection rather than quiescence search  .
- HpChess 1.0 for HP48GX with *MANY* improvements by Franck Zibi, comp.sys.hp48, December 23, 1995
- What and where is the BEST hp48 chess program? by Chris Gotwalt, comp.sys.hp48, March 04, 1997