Arithmetic Subroutines
Derrick Morris · 1983
The arithmetic capabilities of most small computers are limited, and they usually fall below the requirements of both the high-level language compilers, and assembly language programmers. In the case of the PDP11 some hardware enhancements are available. to partially remedy the situation, but in many PDP11’s a software solution is necessary. The most obvious deficiency is the lack of multiply and divide functions, but there is also a need for arithmetic operations which apply to other ‘types’ than the 16-bit integer provided by the basic PDP11.