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firmware: add the D64/D71/D81 engine that GEOS, the block device and VDrive will share - #88

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firmware: add the D64/D71/D81 engine that GEOS, the block device and VDrive will share#88
wesbiggs wants to merge 7 commits into
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wesbiggs:shared-disk-engine

Commits on Nov 4, 2026
- firmware: add the D64/D71/D81 engine that GEOS, the block device and VDrive will share
  
  wesbiggs
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  claude
  committed
  357940f
Commits on Nov 6, 2026
- firmware: a growing file takes free blocks before its last track, as a 1541 does
  
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  1153fec
- firmware: a failed close removes the file it was writing, as a failed write does
  
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- firmware: "@:" keeps the old file until the new one closes, as a 1541 does
  
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  029f455
- test: "@:" over a locked file refuses at create, before anything is written
  
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  7a1d9e7
- firmware: d64_build_dir tells a small buffer apart from an unreadable image
  
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  050deb8
- docs: d64_format_blank is only for an image known to be all zeros
  
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  6ebd42c