4
Initial Checkout and Testing
Once the 8085 SBC rev 3 is assembled, configure it as described in the “Configuration” section,
starting on Page 2. Make sure that
RPA2 - RPA0
(SW2, positions 6-8) are all open.
Double-check all ICs for proper orientation, check all solder joints for cold joints or solder bridges.
Connect the power pigtail provided to a suitable regulated 5 V power supply capable of providing
at least 500 mA. Connect your serial terminal or computer to the console port. Apply power to
your system and press
RESET
. The GWMON sign-on message should be printed to the console, and
GWMON should respond to appropriate user input.
POWER ON
and
ROM ON
LEDs D1 and D2 should
be lit.
4.1
Troubleshooting
If your 8085 SBC rev 3 fails to come up, recheck all solder joints for cold joints, bridges, or missed
pins – this is by far the most common problem we’ve observed during assembly workshops. Recheck
configuration options. Ensure your serial terminal or terminal emulator software is properly config-
ured and that your cable is wired correctly (a RS-232 light box is very helpful here). The Intel 8251A
must
have
CTS
asserted or it will disable its transmitter and refuse to send characters.
Verify that
*BRESET
is properly strobing during power-up and when pressing the
RESET
button (SW1).
If the
ROM ON
(D2) LED does not light after reset, either the power-on options for ROM (J1 and J2)
are incorrect, or the flip-flop circuit is faulty.
4.2
Repair and Service
If you purchased an assembled 8085 SBC rev 3 from The Glitch Works, your board is warranted to
work on arrival. If you have assembled a kit that fails to work, you may return it to The Glitch
Works for evaluation, repair, and testing. For questions concerning returns or configuration, please
visit
http://www.glitchwrks.com/
and click the “Contact” link.
Do note that while we will attempt to help those who have purchased used boards, there is no
warranty extended.
7
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