Replica 1 TE Users Manual
© Briel Computers 2007 page
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Step 15:
Install two 100uF Capacitors C21 & C22. Installation is identical to the 10uF Capacitors installed in
step 14.
Step 16:
Install the two voltage regulators. The 7805 goes near the power switch and the 3940 goes near the
upper right corner. The large flat metal part of the regulator faces to the edge of the board on both regulators.
Install the regulators all the way flush with the board. The leads are thick and are harder to cut after soldering.
Step 17:
Install the ATX power connector. Be sure the connector is flush with the board before soldering.
Step 18:
Install the 5MHz crystal. The crystal is not polarized so it can be installed in either direction. Install
flush to the board, bend the leads away from one another and solder the leads. Cut the extra lead length.
Inspection of your work:
Now that you have completed your soldering, take a few minutes and look over your work. Check for solder
spots that might not be good connections to the posts. Look for bridges where solder may have jumped over
where it wasn’t supposed to go.
Testing your replica 1:
Before installing your IC’s, power up your replica 1. With your multi-meter, check the voltages 5V and GND.
make sure your LED is lit properly. Test pin 14 and pin 7 on the 74LS00 & 74LS04 to make sure you are
getting 5V. Check pin 8 and 16 on 74LS138 for 5V. Once you are satisfied that the power is being distributed
correctly, power off the replica. Install the P8X32A-D40 and 24LC256 EEPROM. Attach an RCA cable to the
replica 1 video port and attach it to your monitor or TV. Power up your replica 1 and see if you get a cursor. It
may move across the screen and that is normal since it is getting a false trigger. If the video section is working
properly, turn off the replica 1 and install the rest of the chips. Power up the replica 1 again, this time press
‘RESET’ button after a couple of seconds and see if the replica 1 resets.
If the circuit is working properly, you will get a “
\
” backslash followed by the cursor ‘
@
’ moving to the next
line. At this point you can power off the replica 1 once more and attach your keyboard. Power up the replica 1,
reset the circuit and try out the keyboard. Congratulations, your replica 1 is now assembled and ready to use.
Caution: Before plugging in the power supply, keyboard and video connector, thoroughly check
over your work for errors.
Any parts that get accidentally damaged during the building process can be replaced at the owner’s expense.
Contact Briel Computers for any replacement parts needed.
The goal of Briel Computers is that ALL replica 1 kits get completed successfully. If you are having a problem,
please feel free to ask for help.