emu_main: IGC drain-wait completion is NONZERO status, not zero (per-page done flag; loop exits when [page]!=0)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-15 18:05:13 -05:00
parent 051544fed6
commit 170b35d812
1 changed files with 4 additions and 3 deletions
@@ -111,9 +111,10 @@ class MainRunner:
        self.heap = [0x08010000, 0x0c010000]   # bump allocator over the DRAM banks

    def h_igcwait(self, cpu):
-        # Post-flush drain wait: the firmware polls [r16] until the IGC clears
-        # it after consuming the region queue. We are the IGC: consume instantly.
-        cpu.mem.w32(cpu.rd(16), 0)
+        # Post-flush drain wait: the firmware polls [page] until the IGC writes a
+        # NONZERO completion status after consuming it (loop at 0xf0421504: exits
+        # the per-page wait when [r16] != 0). We are the IGC: complete instantly.
+        cpu.mem.w32(cpu.rd(16), 1)
        cpu.step()
        return True