!!!OSS Basic A+ ; Copyright (C) 1981 OSS, Inc.
From Wikipedia:\\
Atari BASIC had been designed to fit in a single 8k cartridge, with an optional second cartridge adding additional capability (the Atari 800 home computer featured two cartridge slots). However, the second cartridge was never produced. Instead, OSS produced a disk-based product called BASIC A Plus (or BASIC A+), which was compatible with Atari BASIC but corrected several bugs and added quite a few features. Among the notable features were PRINT USING (for formatted output), trace and debug enhancements, direct DOS commands, and explicit support for the Atari computers' exceptional graphics hardware. Because BASIC A+ had to be purchased, programs developed using its extended features could not be shared with people who did not own the interpreter. BASIC A+ was available on disk only.\\
* [OSS BASIC A+ in Wikipedia|https://en.wikipedia.org/wiki/BASIC_A%2B]\\
* [OSS_BASIC_A_Plus_3.1_Manual-May_1981.pdf] ; size: 1.5 MB
* [OSS_BASIC_A_Plus_3.1_Manual-May_1981-2.pdf] ; size: 13.9 MB
* [OSS_BASIC_A_Plus_Demo_Disk.pdf] ; size: 770 KB
* [OSS_BASIC_A_Plus_all_versions_with_DOS_XL_2.30p_Color.atr] ; all versions of BASIC A+ on a single diskette
* [OSS_BASIC_A_Plus_3.00_to_3.04.atr] ; patch program in BASIC to update BASIC A+ version 3.00 to 3.04.
* [OSS_Basic_A_Plus_Demo_Disk.atr] ; demo diskette for BASIC A+ without DOS
* [OSS_BASIC_A_Plus_version_3.05_with_MS-DOS.atr] ; latest version with rare to find MS-DOS
* [OSS_BASIC_A_Plus_3.00.xex]
* [OSS_BASIC_A_Plus_3.04.xex]
* [OSS_BASIC_A_Plus_3.05.xex]
[{Image src='3.00.jpg' width=452 height=107 }]
OSS Basic A+ version 3.00\\
[{Image src='3.04.jpg' width=442 height=105 }]
OSS Basic A+ version 3.04\\
[{Image src='3.05.jpg' width=448 height=102 }]
OSS Basic A+ version 3.05\\
* [Review for OSS BASIC A+ in ANTIC VOL. 2, NO. 2, MAY 1983|http://www.atarimagazines.com/v2n2/productreviews.html]