Atari 800XL

2M1PTQM
I/O Port Test Failure
PIA
Ports
SIO
Port
POT
Lines
Trigger
Lines
Voltage:
P1,P2
Voltage:
MC
Timers
POSSIBLE CAUSES
U23,
C26-29,
C82-92
LI
9-
22
U22.U23.C75-
78
U22.L15-18.C7I-74
C63-66
U17,
L23,
L30.C96.C97
L25.J5.J6
SOLUTION
Repair
or
replace
Repair
or
replace
Repair
or
replace
Repair
or
replace
Inspect
J5,
U6 for
damaged
pins;
replace
as
necessary.
Repair
or replace
Replace
Q7.L11.U2
U22
30