NMH BASIC

4 months ago

NMH BASIC is a small BASIC interpreter written in the early 1990s, notable for its compact size (under 5K bytes).
Includes a text-mode mine sweeper game using a stackless floodfill algorithm, detailed in the paper 'A Stackless Floodfill Automaton'.
Other programs in the package include Hangman, Nim game, banner printer, and a prime number sieve (the first program written in NMH BASIC).
Originally developed in 1994, with versions in BASYL-II, 8086 assembly, and T3X/0 for Unix compatibility.
Features unique variable naming and array handling, allowing variables like A, A0, and A(0) to refer to the same memory location.
Limited to 12K bytes of memory, with I/O performed on pre-assigned 'units' without file opening/closing capabilities.
Strings and lines are limited to 64 bytes, and IF statements conditionally execute the entire rest of the line.
NMH BASIC II (December 2024) adjusted operator precedence and improved LIST format, reducing size by one byte.
Version 3.x introduces string comparison operators and baudot-encoded units for five-hole paper tape compatibility.
Available for download in multiple versions, including a CP/M-compatible version requiring 32K bytes of TPA.

Hasty Briefsbeta