1 files changed, 3 insertions, 0 deletions
diff --git a/runtime.S b/runtime.S
index ae78bd7..43295d2 100644
--- a/runtime.S
+++ b/runtime.S
@@ -209,6 +209,9 @@ try_fifo_write:
 	push %rbx
 	/* fetch VDP context pointer from 68K context */
 	mov 128(%rsi), %rdx
+	/* check DMA flag */
+	bt $6, 19(%rdx)
+	jc fifo_fallback
 	/* get fifo_cur and compare it to fifo_end */
 	mov (%rdx), %rbx
 	cmp %rbx, 8(%rdx)