Preparation for SPI Inclass work

For next time's class on SPI...

You must mount the bar graph display on the front Plexiglas panel
and wire the display to connect to the SPI port to do this inclass
assignment.

There are just a few connections to be made and you will need them
in later labs. Therefore, create a good, solid mechanical setup 
and make clean solder joints. You may need to remove the panel 
later for debugging so leave yourself a little slack in the wires.
If you wisely used a ribbon connector at the mega128 PORTB port, 
you will already have the PORTB pins at the front panel where
you need to make the connections.

Remember, check twice, or three times, then solder once. 

Connections to be made:

Bargraph board            mega128
--------------       --------------------     
    reglck           PORTB bit 0 (SS_n)                       
    srclk            PORTB bit 1 (sclk)
    sdin             PORTB bit 2 (mosi)
    oe_n             ground (ground on protoboard for now but
                     later, we will connect this to PORTB bit 7
                     to allow dimming of the bar graph display)
    gnd              ground (ground on protoboard)
    vdd              vcc (vcc on any port or on another
                     board on the front panel)
   sd_out           no connect

Boards without properly mounted bar graph displays will not be
eligible or credit. Boards connected only with jumper wires 
are not acceptable.