Week 6

This week, we will continue to build the vector board computers. Complete all the instructions from last lab before

1. Cut out the WRAP-IDs from the sheet you picked up from the instructor. Insert the scotchflex through the edges of each WRAP-ID sheet and through the vector board. Insert appropriatly sized bus, bar strips from the other side of the board. Do this for all the chips that you had on your trainer board computer.
• Remember how you laid out the chips when previously planning your computer. The Hornby opto-isolator should be localized in one corner of the board and there should remain enough space near the output connector to insert three 75LS244's later.


2. It is now time to add a local power supply to the Vector Board.  This power supply uses a 'wall wart' 9 VDC transformer.  You will also need to add a power distribution bus-strip for 5 VDC and Ground.  A schematic for this power system can be found on the circuits page. Remember to pay close attention to the rule that power is not to be 'daisy chained' to more than 3 chips.  The same chips that are chained for power should also be chained for ground.  This is very important.  Don't forget to add capacitors to the power distribution bus.


3. It is now time to finish the opto-isolator circuit. The opto-isolator should be connected to pins A&B on the Vector Board so that Track Power and Track Ground are localized in one corner of the Vector Board.  Pins A&B should be on the WIRE SIDE of the Board.  The resistors for the opto-isolator circuit (and only this circuit) should be soldered directly to the Scotchflex pins.  Other resistors and capacitors will be connected using 'headers'. Have an instructor check your soldering.


4. Insert the ZIF socket into the Scotchflex socket for the EEPROM


5. Solder any needed resistors to the resistor header. Make sure you keep track of where each resistor is connected.


6. Wire up the rest of the chips on your computer. Remember that the WRAP-ID sheets are there to help you figure out the pin numbers. Everything is a mirror image when looking at the chips from below.


7. Test it. Do the MPU, RAM and ECHO 2.0 test only. 

CONGRATULATIONS YOU NOW HAVE A WORKING 'ECHO' ON THE VECTOR BOARD. YOU HAVE NOW COMPLETED THE MIDTERM TEST

Give yourself a high 5 and a pat on the back. If you want to get a head start on the next step, you may add a 7LS244 buffer and begin testing your computer on the STANDARD BOARD. More details on this are available in the next lab handout.