After more than 30 years, STOS BASIC has been rebuilt from its original 1989 V2.06 sources and brought to modern Atari hardware. STOS BASIC V5.5 ALPHA is out now as a free download.
The original STOS was written for an 8MHz 520ST and tends to break or corrupt graphics on anything newer. V5.5 fixes that: it now runs correctly on the Falcon, EmuTOS, 68030 accelerators and fast emulators, all proven across EmuTOS, TOS 1.04, 2.06 and Falcon TOS 4.04.
It's faster, too. Every trap-based inter-library call has been replaced with direct dispatch (125 sprite and 20 music traps removed) and the compiler emits tighter arithmetic and IF code — around 14% average speedup across the 54-test benchmark suite, with FILL, COPY, sprites, CLS BACK and IF gaining 30–50%. The editor has been patched as well (LIST scroll, file-selector and SYSTEM fixes). Best of all, it's 100% source-compatible with V2.06 — your existing STOS listings compile unchanged.
💾 Download
🔗 Release page & older STOS packs
🔗 The STOS Time Tunnel (games, demos, source, extensions, diskzines and manuals)
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