Explore Books on
subroutine

32 basic programs for the PET computer

By Tom Rugg

Commodore 128 data file programming

By Miller, David

Programming microprocessors

By M. W. McMurran

Invitation to FORTRAN for the TRS-80

By Lawrence L. McNitt

TRS-80 assembly language subroutines

By William T. Barden

25 Graphics Programs in Microsoft BASIC

By Timothy J. O'Malley

David Ahl's Basic computer adventures

By David H. Ahl