Write Current Control; Application Guidelines; High-Level Language Considerations - IBM AT 5170 Technical Reference

Write Current Control
Copy protection that uses write current control will not work
because the Fixed Disk and Diskette Drive Adapter selects the
proper write current for the media being used.
Applica tion Guidelines
The following information should be used to develop application
programs for the IBM Personal Computer family.
High-Level Language Considerations
The IBM-supported languages of BASIC, FORTRAN, COBOL,
Pascal, and APL are the best choices for writing compatible
programs.
If
a program uses specific features of the hardware, that program
may not be compatible with all IBM Personal Computers.
Specifically, the use of assembler language subroutines or
hardware-specific commands (In, Out, Peek, Poke, ... ) must
follow the assembler language rules (see "Assembler Language
Programming Considerations" on page 9-8 ).
Any program that requires precise timing information should
obtain it through a DOS or language interface; for example,
TIME$ in BASIC. If greater precision is required, the assembler
techniques in "Assembler Language Programming
Considerations" are available. The use of programming loops
may prevent a program from being compatible with other IBM
Personal Computers.
Compatibility 9-7