ZTL: a subroutine package for the IBM personal computer to support the Ziatech ZT1488 IEEE-488 controller
Frank McGirt, Kurt R. Moore · 1984
The ZTL subroutine package is a set of assembly language subroutines that are callable from Supersoft FORTRAN and provide direct access to the Ziatech IEEE-488 interface hardware. These routines provide functions that are normally available only from assembly language and allow the programmer greater capability when using Supersoft FORTRAN. This is especially important in the development of applications programs that interface directly to hardware.