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-rw-r--r--src/emu/machine/8237dma.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/emu/machine/8237dma.c b/src/emu/machine/8237dma.c
index fb93ca98f88..9477eca96a5 100644
--- a/src/emu/machine/8237dma.c
+++ b/src/emu/machine/8237dma.c
@@ -547,7 +547,7 @@ WRITE8_DEVICE_HANDLER( dma8237_w )
case 15:
/* DMA write mask register */
- dma8237->mask |= data;
+ dma8237->mask = data & 0x0f;
break;
}
}