If there is a test pattern then it is in Diagnostic mode...

From page 2-2 of the Armor... ...Attack manual:
ARMOR ATTACK OPTION SWITCHES
LOCATED ON LOGIC BOARD
AT POSITION E-2

+-----------+
|OFF     ON |
|   ====  1 | \ JEEPS PER GAME
|   ====  2 | / SEE TABLE ONE
|   ====  3 | \ CREDITS PER GAME
|   ====  4 | / SEE TABLE TWO
|   ====  5 |   SOUND IN ATTRACT MODE
|   ====  6 |   NOT USED
|   ====  7 |   DIAGNOSTIC - ON: NORMAL PLAY
|           |                OFF: TEST PATTERN
+-----------+

+-------+-------+-------+ +-------+-------+-------+
|       |       | JEEPS | |       |       |CREDITS|
|SWITCH |SWITCH |  PER  | |SWITCH |SWITCH |  PER  |
|   1   |   2   |  GAME | |   3   |   4   | COIN  |
+-------+-------+-------+ +-------+-------+-------+
+-------+-------+-------+ +-------+-------+-------+
| OFF   | OFF   |   5   | | OFF   | OFF   |  1/1  |
+-------+-------+-------+ +-------+-------+-------+
| OFF   |  ON   |   4   | | OFF   |  ON   |  1/2  |
+-------+-------+-------+ +-------+-------+-------+
|  ON   | OFF   |   3   | |  ON   | OFF   |  3/2  |
+-------+-------+-------+ +-------+-------+-------+
|  ON   |  ON   |   2   | |  ON   |  ON   |  3/4  |
+-------+-------+-------+ +-------+-------+-------+
--
THANX...Gregg   day 214.684.7380  night UNLIST/PUBL   TEXAS NOT CANADA!
woodcock@bnr.ca  or  woodcock@nt.com  or  bn202@cleveland.freenet.edu
*CLASSIC VIDEOGAME COLLECTOR BUY/SELL/TRADE NON-COMPUTER (ARCADE/HOME)*
"If you quote me on this I'll have to deny it; I won't remember because
I have such a bad memory.  Not only that, but my memory is *terrible*."