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docs(ab): hw4 evidence fix round 1 - bit-write gap provenance, README/CLI/fixture docs, libplctag-deletion gap

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Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe
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Joseph Doherty
2026-10-09 04:12:53 -04:00
parent 14ec145487
commit 9e894decb0
7 changed files with 37 additions and 31 deletions
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docs/drivers/AbLegacy.md
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@@ -219,7 +219,7 @@ Everything below is against the `ab_server` simulator; no real PCCC controller h
| F-file read (`F8`) | one capture, `slc500-read-f8` (codec parity only; no native F write on a wire) |
| S (incl. the default probe `S:0`), B, T, C, R, L, ST, A, O, I | **none** — encoded from the PCCC file-type table |
| MicroLogix function files (RTC/HSC/...), PLC-5 octal I/O | **none** — parsed only; native refuses function files as Unsupported |
| Bit-within-word write (`B3:0/5`) | `ab_server` SLC500 + MicroLogix, both transports (`AbLegacyBitWriteTests`): the driver RMWs the parent word, only the addressed bit changes. PLC-5 native refuses it (`BadNotSupported`, #571) |
| Bit-within-word write (`B3:0/5`) | `ab_server` SLC500 + MicroLogix, both transports (`AbLegacyBitWriteTests`): the driver RMWs the parent word, only the addressed bit changes (the parent-word read-modify-write is not atomic against ladder writes to the same word). PLC-5 native refuses it (`BadNotSupported`, #571) |
| Indirect addressing (`N7:[N7:0]`) | `ab_server` N-file, both transports (#646) - resolved by the driver, the transport sees the composed address |
| T/C/R sub-elements (`.PRE`/`.ACC`/`.LEN`/`.POS`), 6-byte T/C/R element layout | **none** |