hp54600_get_pmem (ul_scopes)

	status.i4.v = hp54600_get_pmem(data ra.r, channel.i4.v, dev_address.i4.v, 
				      points.i4.r)

	Retrieves trace data from pixel memory from HP54600 scope.

       data		returned voltage scaled trace data.
       channel		channel to request data for: 
			HP_PMEM1 -> Pixel Memory Channel 1
			HP_PMEM1 -> Pixel Memory Channel 2
	dev_address	address of scope; A previos call to gpib_select()
			will have to be made to establish communication 
			to correct VME.
	points		returns the number of points the scope is using

	This function returns ACNET status values as follows:

	CBS_OK			success
	CBS_INVARG		invalid device address
	otherwise		GAS error

	This function requires the following include files:

	ul_scopes_h:hpdefs_h

	Related functions:

	hp54600_display_pmem, hp54600_get_plot_limits, hp54600_get_pmem,
	hp54600_get_waveform, hp54600_message, hp54600_set_acquire, 
	hp54600_set_channel, hp54600_set_display, hp54600_set_timebase,
	hp54600_set_trigger, hp54600_set_waveform, hp54600_store_pmem