From d0b53e93dd3948f57afef0fffa623fada8ff06aa Mon Sep 17 00:00:00 2001 From: Cyd Date: Sat, 4 Jul 2026 20:22:14 -0500 Subject: [PATCH] RIO firmware notes: exact EPROM part (AM27C512-150) + replacement pick Co-Authored-By: Claude Fable 5 --- emulator/rio-firmware/README.md | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/emulator/rio-firmware/README.md b/emulator/rio-firmware/README.md index 75bfb5b..4d5bf5b 100644 --- a/emulator/rio-firmware/README.md +++ b/emulator/rio-firmware/README.md @@ -1,8 +1,12 @@ # 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)