

	Diskless Node Power Requirements

  			+5 VDC	+12 VDC		-12 VDC		-5.2 VDC
-------------------------------------------------------------------------
68020 CPU		5.75A	0.05A		0.05A

HSMEM 2 MEG *4		11.0A
	2.75A ea.

ETHERNET		5.6A	0.5A

COLOR GRAPHICS SET	13.0A					2.0A

VME BACKPLANE		1.7A

KEYBOARD & MOUSE	0.5A	0.05A		0.05A

CONTROL LOGIC		0.05A	0.05A
			-------------------------------------------------
TOTAL CURRENT		37.6A	0.65A		0.10A		2.0A

POWER			188W	7.8W		1.2W		10.4W

*******************************  In this configuration a total of 8 VME card
*  TOTAL POWER = 207.4 WATTS  *  slots are used.
*******************************

============================================================================

	Disk Node Power Requirements (w/ 1/2 high 5.25 in. CDC winchester)

  			+5 VDC	+12 VDC		-12 VDC		-5.2 VDC
-------------------------------------------------------------------------
68020 CPU		5.75A	0.05A		0.05A

HSMEM 2 MEG 		2.75A

VME SCSI		3.5A

ETHERNET		5.6A	0.5A

COLOR GRAPHICS SET	13.0A					2.0A

VME BACKPLANE		1.7A

ADAPTEC CONTROLLER	1.5A	0.3A

WINCHESTER		0.6A	2.0A

KEYBOARD & MOUSE	0.5A	0.05A		0.05A

CONTROL LOGIC		0.05A	0.05A
			-------------------------------------------------
TOTAL CURRENT		34.95A	2.95A		0.10A		2.0A

POWER			174.75W	35.4W		1.2W		10.4W

*******************************  In this configuration a total of 6 VME card
*  TOTAL POWER = 221.8 WATTS  *  slots are used. The remaining 2 slots are
*******************************  consumed by the winchester disk drive and
				 the Adapted disk controller.









The current supply used in the Diskless Node is a Cherokee QT6R2 which has
the following ratings:
	+5 VDC @ 25A  30A peak,
	+12 VDC @ 1A  1.5A peak,
	-12 VDC @ 1A  1.5A peak,
	-5.2 VDC @ 3A  4A peak.
The total power output is rated at 150 watts convection cooled, 175 watts
forced air (25 CFM) cooled. This ratings of this supply don't meet our current
needs or our future needs as can be seen from the data above. To accomodate
our existing and future needs we should be using a 220 to 250 watt power
supply.
