Figure 3-9. PORT Test display
In figure above PORT test results are shown: left – ports OK, the right errors due to lack of
loopbacks.
DIAGNOSTIC ERROR CODES
During the test, using a test cartridge can occur error codes (for a bright background word
ERROR CODE XX). In some cases, usually when damaged RAM area of the screen, the
word may be wrong, reversed, etc.
The meaning of the error codes described below.
SYSTEM ERRORS
01 ANTC’s horizontal or vertical sync error.
02 ANTIC’s vertical blanking interrupt error.
03 DISPLAY LIST interrupt error.
04 Writing or reading page 0 or 1 RAM error.
05 Data lines error. Possible damage RAM.
06 Address lines or address decoding error (damage RAM).
07 Refresh when saving byte 00 error.
08 Refresh when saving byte FF error.
10 Writing status register errors. Damage RAM
11 An error was detected during the test POKEY-timers.
12 POKEY interrupts error
ERRORS PORTS
34 Serial communication fault. Damage to the line DATA IN or DATA OUT or damaged
POKEY.
35 Control serial communication error. Faulty line PROCEED, INTERRUPT or
COMMAND. Faulty PIA or POKEY.
36 Control serial communication error. In any case of error 35 can also occur when an error
36 error 35 can not occur - POKEY damaged or IRQ line to the processor or the processor
itself.
37 Joystick port error. Socket is damaged, the lines connecting them to the PIA or PIA.
38 Damage to potentiometric inputs. Damaged socket, connecting lines or POKEY.
130XE Personal Computer
Field Service Manual 3-7
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