BATTLEZONE SELF TEST ERROR CODES RAM FAILURE Indicated by a sequence of tones. Short low tones indicate a good RAM chip while a long high tone means a bad RAM. You may have to short /WDDIS to ground to complete the RAM tone test. Long High Tone Bad RAM Chip Location 1st J2 2nd H2 3rd A2 4th A1 5th B2 6th B1 7th C2 8th C1 9th D2 10th D1 ROM/PROM Failure Indicated by two sets of numbers. The first indicates the location while the second shows the incorrect data checksum. Displayed # Failing ROM Failing PROM 0 B/C3* B/C3*, E3 1 A3 A3, F/H3 2 E1 3 F/H1 4 J1 5 K1 6 L/M1 7 N1** * If ROM/PROM B/C3 is bad, you will hear a continous low tone, and the program may be unable to display a screen image. ** If ROM N1 is bad, program will be unable to produce tones in RAM test. MATHBOX ERRORS Displayed Letter Failure T Time out Error H Data Error- High Byte L Data Error- Low Byte All switches will produce a tone when closed in the self test.