diff --git a/emulators/81.yml b/emulators/81.yml
index 1c169552..02d480eb 100644
--- a/emulators/81.yml
+++ b/emulators/81.yml
@@ -42,7 +42,6 @@ files:
     mode: standalone
     size: 8192
     md5: db398d4e4e93a6d4dee3bfe146918219
-    validation: [crc32]
     note: "ZX81 8K BASIC ROM (edition 3, default). Embedded in libretro core as zx81.rom."
     source_ref: "Source/zx81config.cpp:260, 81/zx81/snap.c:489"
   - name: zx81.edition1.rom
@@ -67,7 +66,6 @@ files:
     mode: standalone
     size: 4096
     md5: e03bd725f98be45aac39c85f7fd41ce4
-    validation: [crc32]
     source_ref: "Source/zx81config.cpp:259, Source/HW_.cpp:2741"
 
   # ZX97LE
@@ -86,7 +84,6 @@ files:
     mode: standalone
     size: 8192
     md5: db6efdfd82cebdfbb493d85b1a5efc3c
-    validation: [crc32]
     source_ref: "Source/zx81config.cpp:279, Source/HW_.cpp:2787"
 
   # Timex TS1500
diff --git a/tests/test_profile_checks.py b/tests/test_profile_checks.py
index f451390b..438f4e61 100644
--- a/tests/test_profile_checks.py
+++ b/tests/test_profile_checks.py
@@ -175,5 +175,20 @@ class BeetlePceSystemCards(_Probe):
                 self.assertFalse({"md5", "sha1", "crc32", "sha256"} & set(entry))
 
 
+class EightyOneRoms(_Probe):
+    """memory_load reads the ROM and CRC32Block's value only picks the tape
+    patches in rompatch.c; a ROM the table does not know loads without them
+    (81/zx81/zx81.c:102-103, 81/Ace/ace.c:77-78, 81/zx81/rompatch.c at
+    fa70949). The profile declared a crc32 check with no value."""
+
+    def test_an_unknown_rom_is_not_refused(self):
+        for name, size in (("zx81.edition3.rom", 8192), ("zx80.rom", 4096),
+                           ("jupiterace.rom", 8192)):
+            with self.subTest(name=name):
+                self.assertTrue(self.accepts("81", name, b"\1" * size))
+                entry = next(f for f in _profile("81")["files"] if f["name"] == name)
+                self.assertNotIn("crc32", entry.get("validation") or [])
+
+
 if __name__ == "__main__":
     unittest.main()