diff --git a/.gitignore b/.gitignore
index bc4dcb8..b4038ce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
-# SGI firmware dumps and generated wrappers (copyrighted, fetch on demand)
-roms/*.bin
+# Downloads and generated wrappers. The four checked-in .bin dumps are the
+# archived ROM set; the zip is only an acquisition artifact.
 roms/*.zip
 roms/*.elf
 
diff --git a/README.md b/README.md
index 352dbdc..eb8c142 100644
--- a/README.md
+++ b/README.md
@@ -32,17 +32,20 @@ table, boot flow and function anchors.
 See [docs/rom-map.json](docs/rom-map.json) for the machine-readable layout and
 [docs/procedure-index.csv](docs/procedure-index.csv) for every function start.
 
-## ROM files are not committed
+## ROM files
 
-The PROM dumps are copyrighted SGI firmware. `roms/*.bin`, the MAME zip and the
-generated ELF wrapper are ignored by git. Fetch and verify them with:
+The four PROM dumps from the MAME 0.236 `indy_4610` set are committed under
+`roms/` for preservation, together with `roms/SHA1SUMS`. The MAME zip and the
+generated ELF wrapper stay ignored.
+
+The dumps can be re-fetched and verified with:
 
 ```bash
 ./tools/fetch-roms.sh
 ```
 
-The fetch script downloads the MAME 0.236 `indy_4610` set and checks every SHA-1
-against MAME's `src/mame/sgi/indy_indigo2.cpp`.
+The fetch script downloads the `indy_4610` set and checks every SHA-1 against
+MAME's `src/mame/sgi/indy_indigo2.cpp`.
 
 ## Reproduce the analysis
 
diff --git a/roms/README.md b/roms/README.md
index 1cd6692..208a18c 100644
--- a/roms/README.md
+++ b/roms/README.md
@@ -1,8 +1,11 @@
 # ROM dumps
 
-The binaries themselves are not committed; they are copyrighted SGI firmware.
-Run `../tools/fetch-roms.sh` to download the MAME 0.236 `indy_4610` set and
-verify it against `SHA1SUMS`.
+These four dumps from the MAME 0.236 `indy_4610` set are committed here for
+preservation. They are copyrighted SGI firmware; check your local rules before
+redistributing them.
+
+Verify them against `SHA1SUMS`, or re-fetch the set with
+`../tools/fetch-roms.sh`.
 
 | File | Version | Notes |
 | --- | --- | --- |
diff --git a/roms/ip24prom.070-9101-005.bin b/roms/ip24prom.070-9101-005.bin
new file mode 100644
index 0000000..81b1498
Binary files /dev/null and b/roms/ip24prom.070-9101-005.bin differ
diff --git a/roms/ip24prom.070-9101-007.bin b/roms/ip24prom.070-9101-007.bin
new file mode 100644
index 0000000..472941c
Binary files /dev/null and b/roms/ip24prom.070-9101-007.bin differ
diff --git a/roms/ip24prom.070-9101-008.bin b/roms/ip24prom.070-9101-008.bin
new file mode 100644
index 0000000..f29e66f
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diff --git a/roms/ip24prom.070-9101-011.bin b/roms/ip24prom.070-9101-011.bin
new file mode 100644
index 0000000..8bd5202
Binary files /dev/null and b/roms/ip24prom.070-9101-011.bin differ