This was a global setting that could be changed to better manage memory by setting it to a smaller value, or allow longer strings up to a maximum of 132 characters. Unlike the other fixed-length BASIC dialects, string variables did not have to be DIMmed prior to use, instead, all strings defaulted to a maximum length of 72 characters. It contrasts with the DEC/Microsoft style, where strings were dynamically allocated on a heap.
This was similar to the other BASICs that used slicing notation, like HP and Atari. Internally, CP-V used a fixed-length string layout consisting of an array of bytes that could not be changed in size at runtime.
Sds language audi manual#
The manual notes that the latter format was added for compatibility with A00 BASIC. The later CP-V BASIC added true string variables containing up to 132 characters that could be indicated with a trailing dollar sign, $, or uncommonly, a leading $ - A$ and $A are equivalent. However, string values could be assigned to numeric variables which could store six characters as their EBCDIC numeric values. The early versions of SDS BASIC, sometimes known as Batch BASIC or BTM BASIC, did not support string variables. Īn alternate form of REM was a leading star, *, similar in purpose to the short-form found in MS-derived BASICs, the single quote, '. SDS BASIC is historically notable as the platform on which the original Star Trek computer game was written in the summer of 1971. This makes conversion from SDS to modern dialects somewhat difficult. Altair BASIC was patterned on BASIC-PLUS, and this style became the de facto standard after the cross-platform version, Microsoft BASIC, became almost universal during the home computer era. This style of string manipulation differs from the model introduced in DEC's BASIC-PLUS, which used string functions. The string library allowed manipulation of strings using array slicing syntax, similar to the system found in HP Time-Shared BASIC and a number of microcomputer BASICs like Integer BASIC and Atari BASIC. The original versions did not include support for string variables, although this was added for the version running under the CP-V operating system when it was released in 1971. Xerox purchased SDS in 1969 and began rebranding it as Xerox Data Systems, and finally just Xerox, at which time the language became known as Xerox BASIC.
Sds language audi series#
SDS BASIC, also known as CP-V BASIC, Batch BASIC or Sigma BASIC depending on the version, is a BASIC programming language compiler for Scientific Data Systems's (SDS) Sigma series mainframe computers, originally released in 1967.
HP Time-Sharing BASIC, SCELBAL many others
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