PPC Journal was an early hobbyist computer magazine, originally targeted at users of HP's first programmable calculator, the HP-65.
[1] The founder of the PPC (Personal Programming Center) and editor of the journal was Richard J.
[2] This hobbyist group worked around the journal and was known because Nelson discovered hidden instructions on the HP-65 calculator.
A similar journal since 1976 was 52-Notes for the Texas Instruments SR-52 user community.
[3] Both journals deliberately established a mode of "friendly competition", often exchanging information and comparing solutions among user groups.