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+READ_DMA (0xC8) command does not work correctly
+
+The QEMU PC emulation of DMA does not behave like real hardware or other virtualization software.
+
+From the original bug report (Benjamin David Lunt):
+
+    Back to the READ_DMA command, it is my conclusion that the
+    READ_DMA command, more precisely, the BUS Master part of QEMU is
+    in error.  The tests that people have done to see if it works, is
+    probably the guest finding out that DMA doesn't work and defaulting
+    to PIO, but since the read was successful visually to the user, the
+    user assumed the READ_DMA command works, where the guest actually
+    defaulted back to PIO transfers without notice.
+
+    My code works on real hardware (numerous machines), Bochs, and Oracle's
+    Virtual Box.
+
+    ...
+
+    I have a small test suite, zipped and included at:
+    www.fysnet.net/temp/c8bug.zip
+
+    Within this zip file is a.img. This is a freeDOS bootable
+    floppy.  Emulate it with QEMU and then at the DOS prompt, run
+    c8bug.exe.
+
+    It will say that the drive is not ready.
+     "Drive never became ready"
+    (along with a few other lines of text)
+
+    The source for this test suite is also included.
+     c8bug.c is the c source code
+     c8bug.h is the header file
+     ctype.h is a quick way to get 'bit8u' type defines
+     timer.h is a delay routine from another project I have
+    (The base IO addresses are assumed and set at the top of c8bug.c)
+    (compiled with DJGPP for DPMI)
+
+    q.bat is my command line for QEMU
+
+    On all other machines and VirtualBox, the controller is ready
+    for me to receive the sector data.
+     "Drive is ready to transmit data..."
+
+    However, in QEMU, the controller never becomes ready.
+     "Drive never became ready" 
+
+The bug was reported for QEMU for Windows, but I can confirm that QEMU for Linux also shows that
+behaviour, while VirtualBox works.
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