A Graphics Tower Printed Circuit Board Interconnects



This appendix shows the Graphics Tower printed circuit board interconnects: test points, connectors, and jumpers, and the power supply wiring diagram.

GT SBus Adapter Board (501-1693)

    Figure A-1 GT SBus Adapter Board Interconnects

The GT SBus Adapter Board has no jumpers or interconnects.

Frame Buffer Board (501-1624)

    Figure A-2 Frame Buffer Board Interconnects

    Table A-1 Light Pen Connector

Pin Signal 1 Not used 2 Not used 3 Light pen switch 4 Not used 5 Not used 6 Light pen input 7 Vcc 8 Ground 9 Not used

    Table A-2 Aux Video (5W5) Connector

Not currently used.

    Table A-3 Monitor (13W3) Connector

Pin Signal A1 Red A2 Green A3 Blue 10 CSync Return 9 MON_ID_0 8 MON_ID_1 7 Vertical Sync Return 6 Horizontal Sync 5 CSync 4 MON_ID Return 3 MON_ID_2 2 Vertical Sync 1 Horizontal Sync Return

Graphics Processor Front End Board (501-1692)

    Figure A-3 Graphics Processor Front End Board Interconnects

    Table A-4 Diagnostic Switch

Position Meaning DIAG Invokes the PROM power-on diagnostics during system power-up. See Chapter 3. NORM Disables the power-on diagnostics.

    Table A-5 Graphics Processor Front End Board Jumpers

Label Position Description P0201 In Remove jumper to disable cache. P0701 In Remove jumper for i860 ICT test.

Graphics Processor Rendering Pipeline Board (501-1726)

    Figure A-4 Graphics Processor Rendering Pipeline Board

    Table A-6 Graphics Processor Rendering Pipeline Board - J1401 Jumpers

Pins Position Description 1 - 2 Out DSP0_EMU1 to GND 3 - 4 Out DSP0_EMU0 to GND 5 - 6 Out DSP0_EMU2 to GND 7 Out Vcc 8 Out Not used 9 - 10 Out DSP0_EMU3 to GND 11 - 12 Out PRE_DSP0_H1

    Table A-7 Graphics Processor Rendering Pipeline Board - J1701 Jumpers

Pins Position Description 1 - 2 Out DSP1_EMU1 to GND 3 - 4 Out DSP1_EMU0 to GND 5 - 6 Out DSP1_EMU2 to GND 7 Out Vcc 8 Out Not used 9 - 10 Out DSP1_EMU3 to GND 11 - 12 Out PRE_DSP1_H1

Note - Jumpers J1401 and J1701 provide emulation control for factory test of the TMS320 digital signal processors, U1401 and U1701 respectively. These jumpers are always left out for normal board operation.

Backplane

    Figure A-5 Backplane Layout as Seen From the Bezel Side

The jumpers shown in Figure A-5 (P100 through P300) are not used when this backplane is used in the Graphics Tower.

Power Supply Connections

    Figure A-6 Power Supply Connections