What-to-Do-After-you-Hit-Return

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What-to-Do-After-you-Hit-Return

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Listings of the HP BASIC games from the 1975 edition of What to Do After you Hit Return from the PCC

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What To Do After You Hit Return
===============================

*[What to Do After you Hit Return](https://archive.org/details/Whattodoafteryouhitreturn/mode/2up)* is a collection of computer games first published by the People's Computer Company (PCC) in 1975. The collection includes most of the better known programs from the [PCC listings](https://github.com/maurymarkowitz/Peoples-Computer-Company-code). A selection of other games like *Star Trek* and *Civil War* were added from other sources, including *[101 BASIC Computer Games](https://github.com/maurymarkowitz/101-BASIC-Computer-Games)*. Many of these would later re-appear, converted to MS-BASIC, in the much more famous *[BASIC Computer Games](https://github.com/GReaperEx/bcg)* in 1978. Curiously, a number of the games are not provided in source form, for instance, *Star Trek* (STTR1) is detailed in the text, but not provided in source form.

The programs in this repository were written in [HP-BASIC](https://en.wikipedia.org/wiki/HP_Time-Shared_BASIC), for the then-popular [HP 2000](https://en.wikipedia.org/wiki/HP_2100) systems. This makes the source code somewhat harder to convert to "modern vintage" systems based on MS-derived BASICs like those found on the Apple II or Commodore line. There are hints of a 1978 edition of the book converted to MS-BASIC, but I have not found a copy of that release, if it exists. These programs were collected in the original HP format as test cases for [RetroBASIC](https://github.com/maurymarkowitz/RetroBASIC), which should run them all without conversion.

HP-BASIC had a few quirks, like using `#` for not-equals (in addition to the normal `<>`) and that all arrays can be defined and accessed using either square or round brackets. The main practical difference is its handling of strings, which was more like FORTRAN's "array of characters" than MS-style variable-length objects. All strings must be DIMmed, one dimension only and up to a maximum of 72 characters. The MS-style `LEFT/MID/RIGHT` are replaced by a "slicing" system using array notation - to get the first five characters of a string you would use `A$[1,6]`. Be careful of off-by-ones when converting to and from MS-style, `A$[1,6]` is the equivalent of `LEFT(A$,5)`.

HP-BASIC was perhaps the most widely used dialect before the Altair 8800 led to MS-BASIC. Many early microcomputer dialects were patterned on it; Apple BASIC (today known as [Integer BASIC](https://en.wikipedia.org/wiki/Integer_BASIC)), [Atari](https://en.wikipedia.org/wiki/Atari_BASIC), [Sinclair](https://en.wikipedia.org/wiki/Sinclair_BASIC), [Northstar](https://en.wikipedia.org/wiki/North_Star_BASIC) and many other versions use some slight variation on the HP string handling. Anyone with experience with these versions will feel right at home.

These listings were initially hand-converted from a [copy of the book on Archive.org](https://archive.org/details/Whattodoafteryouhitreturn). The original listings were manually cut and pasted to fit into fewer pages, and the scan is both distorted and blurry, so in some cases best-guesses have been made in the case of variable names and a few numeric constants. The difference between round and square bracketing is almost indistinguishable in the listings, so for clarity, in these conversions all slicing commands use square and everything else uses round. Later additions were converted using Google Gemini, with good results, but this sometimes changes whitespace and <> for # so small differences may be found.

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