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diff --git a/sys/imio/iki/qpf/qpfopix.x b/sys/imio/iki/qpf/qpfopix.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	<imio.h>
+include	"qpf.h"
+
+# QPF_OPIX -- Open the "pixel storage file", i.e., open the special QPF/QPOE
+# virtual file driver, which samples the QPOE event list in real time to
+# produce image "pixels", where each pixel contains a count of the number of
+# photons mapping to that point in the output image matrix.
+
+procedure qpf_opix (im, status)
+
+pointer	im			#I image descriptor
+int	status			#O return status
+
+pointer	sp, fname, qpf
+extern	qpfzop(), qpfzrd(), qpfzwr(), qpfzwt(), qpfzst(), qpfzcl()
+int	fopnbf()
+
+begin
+	status = OK
+	if (IM_PFD(im) != NULL)
+	    return
+
+	# Verify that the QPIO open succeeded at open time; if not, the file
+	# may not have an event list (which is legal, but not for pixel i/o).
+
+	qpf = IM_KDES(im)
+	if (QPF_IO(qpf) == NULL) {
+	    status = ERR
+	    return
+	}
+
+	call smark (sp)
+	call salloc (fname, SZ_FNAME, TY_CHAR)
+
+	# Encode the QPF descriptor as a pseudo-filename to pass the descriptor
+	# through fopnbf to the QPF virtual binary file driver.
+
+	call sprintf (Memc[fname], SZ_FNAME, "QPF%d")
+	    call pargi (IM_KDES(im))
+
+	# Open a file descriptor for the dummy QPOE file driver, used to access
+	# the event list as a virtual pixel array (sampled at runtime).
+
+	iferr (IM_PFD(im) = fopnbf (Memc[fname], READ_ONLY,
+	    qpfzop, qpfzrd, qpfzwr, qpfzwt, qpfzst, qpfzcl)) {
+
+	    IM_PFD(im) = NULL
+	    status = ERR
+	}
+
+	call sfree (sp)
+end