Tachikoma
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AKBASIC_MAX_LINE_LENGTH's cut from 256 to 80 left seventeen lines of examples/megademo unloadable: the sixteen IM$() picture strings (up to 252 characters) and TUNEA/TUNEB's four-bar PLAY strings (174 and 175). The real ceiling is 78 characters, not 80 -- stdio_readline() refuses a read that fills the 80-byte buffer without a newline, so content plus its terminator must fit in 79. The picture: vaporwave.py's PAYLOAD drops from 240 to 64, so every emitted IM$(NN) = "..." line fits under the ceiling. chop() no longer slices blind; it walks the stream a record at a time -- two characters for a run, three for an R row record -- and never cuts inside one, because the decoder reads a record's tail with MID on the string it is walking and a record straddling two IM$ entries decodes as garbage. The old blind slice at 240 only happened to be safe. verify() now simulates the CHOPPED strings with the cursor threaded across the boundaries exactly the way DRAWSTREAM executes them, so a bad cut is an assertion failure instead of a corrupted screen, and emit_block() asserts every emitted line fits. The picture is 56 strings where it was 16; the decoder needed no changes at all, since it already carries X#/Y# from one IM$ entry to the next. The music: TUNEA and TUNEB each become four PLAY statements, one bar apiece. play.c keeps voice, envelope, level and duration state on the runtime across statements and every PLAY appends to the same queue, so four bars queue exactly as one long string did. Each bar restates the V1T3U9S prefix so a bar dropped by QFULL cannot leave the next batch playing on the drum kit's envelope. Everything still clears the shrunken pools with room to spare: 1625 source lines of 2048, ~704 array slots of 2048, identifiers within the 24-character symtab key. Verified end to end against this branch's build: the demo loads, the offscreen host renders every scene, and the scene-5 still is pixel-identical to vaporwave.py's own preview. The test suite fails the same seventeen cases with and without this commit. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01ACffnV6F7sxQuG3Y8a1L3s
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