RIO firmware notes: exact EPROM part (AM27C512-150) + replacement pick

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-04 20:22:14 -05:00
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 # RIO board firmware

 - **`RIOv4_2.bin`** — RIO cockpit I/O board firmware **v4.2**, dumped
-  2026-07-04 from one of our own boards' EPROM (64KB / 27C512-class image).
+  2026-07-04 from one of our own boards' EPROM: an **AMD AM27C512-150**
+  (64K x 8 UV EPROM, 150ns — the image fills it exactly).
  sha256 `60a88718835c654b6135dbec7721c40ef99dca07df2ad4b57eedeb24037a5f73`.
+  For the eventual patched burn: a pin-compatible Winbond W27C512
+  (electrically erasable, TL866-friendly) drops straight into the socket;
+  the original AMD chip gets labeled and preserved unmodified.

 ## First-look analysis (from the image alone, confirmed on hardware)