diff --git a/bad-apple/README.md b/bad-apple/README.md
index 6d1d119..dcdc136 100644
--- a/bad-apple/README.md
+++ b/bad-apple/README.md
@@ -91,6 +91,14 @@ The 1987 TI TMS34010 SDK runs under DOSBox. The C sources are K&R C: the
 1987 compiler rejects ANSI prototypes and `const`. `.text` is linked at bit
 `0x018C0000`, `.bss` at `0x01C00000`.
 
+The 1990 **r5.01 OS/2** toolchain under `2ine-tms34010` also builds it (see
+`tools/tms34010-sdk/2INE-501.md` for setup). Build `MAIN.C` without
+`gspopt -O2`: the optimizer hoists the `CTRL_READY` polling load and the
+payload waits forever at takeover. `MOVIE.C` is fine at `-O2`. The verified
+r5.01 build is `.text` 3,168 bytes, entry `0x018C5C70`, and is MAME-exact at
+frames 0 and 180. `gspac`/`gspcg` exit 139 at teardown but still write valid
+files.
+
 ## Run in MAME (debugger path)
 
 For a window, use `tools/run_mame_gui.sh` (above). For scripted/headless
diff --git a/bad-apple/REPORT.md b/bad-apple/REPORT.md
index 5fa08d5..026453d 100644
--- a/bad-apple/REPORT.md
+++ b/bad-apple/REPORT.md
@@ -89,6 +89,32 @@ bind: the marker shows `status=0x20` and no socket is open. The suspect is
 size. The debugger path is the working demo. A fixed low-RAM staging receive
 or raw-LANCE loader is the next step. This is the one delivery-path gap.
 
+## r5.01 OS/2 compiler check (2026-11-01)
+
+The 1990 TMS340 r5.01 ANSI C toolchain, run under the patched
+`2ine-tms34010` fork, builds this demo. The pipeline was:
+
+```
+gspac -k MAIN.C MAIN.IF
+gspcg -m MAIN.IF MAIN.ASM MAIN.TMP     # no gspopt for MAIN.C
+gspa MAIN.ASM
+gspac/gspopt -O2/gspcg/gspa for MOVIE.C
+gspa FILL.ASM
+gspa ENTRY.ASM
+gsplnk PLAYER.CMD                       # .text 018C0000h, .bss 01C00000h
+```
+
+Result: `.text` `0x6300` bits = **3,168 bytes**, entry **`0x018C5C70`**.
+MAME frame 0 and frame 180 are **EXACT** with
+`BA_PAYLOAD=PLAYER.bin BA_ENTRY=0x018C5C70`.
+
+Caveat: `gspopt -O2` on `MAIN.C` hoists the `CTRL_READY` polling load and
+the payload waits forever at takeover. `MOVIE.C` is fine at `-O2`; build
+`MAIN.C` without `gspopt`, or add `volatile` to the polling reads. `gspac`
+and `gspcg` exit 139 at teardown but still write valid output files.
+`gspa` 5.01 accepted `entry.asm`/`fill.asm` (including `sp`); the `b15`
+round-trip difference does not affect this demo.
+
 ## Regression
 
 The no-env MAME baseline at 200 frames is unchanged: