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# Trap MBF32 assignment overflow in GW and BASICA - #293
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Sourcing rung 2: GW-BASIC 3.23 is proprietary; the expected output comes from the genuine interpreter through tests/diff/gw/MBF32OVR.BAS, with no proprietary code copied. The MIT 1983 interpreter source is not a version-matched 3.23 implementation; the Microsoft GW-BASIC User Guide supplies the MBF layout. The pre-fix runtime printed MISSED; the patched runtime matches the oracle byte for byte.
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Reject MBF32 stores whose rounded IEEE exponent cannot map to MBF, raising BASIC Error 6. Add BASICA/GW optimized and unoptimized boundary tests and a genuine GW-BASIC 3.23 differential fixture. Local suite: 6,560 passed, 12 environment skips. Genuine oracle and patched DOS output match byte for byte; pre-fix DOS output differs. The second commit refreshes INDEX.md.