Electro-Metrics EM-2115, Instruction Manual

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EM-2115APPENDIX 4A TROUBLESHOOTING MICROPROCESSOR BD ASSEMBLY
(EM21154A-7)
PIA TABLE LISTING
EM-2115
BIT # PORT A BIT # PORT B
PIA #2 (U25) PIA #2 (U25)
a5 Sweep Speed (C)
J2-22 b5 Data Available
(Keyboard)
a6 Full Band (=0)
J2-3 b6 (Busy) (A/D)
a7 Hold (Sweep)
STOP (Sweep) b7 End of Band J2-4
PIA #3 (U22) PIA #3 (U22)
a0 1-7 Band Logic J1-
11 b0 Band Code In
J1-14 (1)
a1 8-10 Band Logic
J1-9 b1 Band Code In
J1-16 (2)
a2 11-15 Band Logic
J1-7 b2 Band Code In
J1-18 (4)
a3 3-4 Band Logic J1-
5 b3 Band Code In
J1-22 (8)
a4 NB Logic J1-21 b4 Detent J1-20
a5 0.1 NB Logic J1-
19 b5 Sweep Width Log-
ic (detent) J3-4
a6 Band Step DOWN
J1-15 b6 Reverse Sweep
J2-15
a7 Band Step UP J1-
17 b7 AFC/FT Sensitivi-
ty J2-8
PIA #4 (U24) PIA #4 (U24)
a0 BFO J1-31 b0 Counter Range
Select
a1 AM/FM (FM =1)
J2-20 b1 Counter Range
Select
a2 Marker Logic (=0)
J2-5 b2 AFC J2-11
a3 Remote Logic (=1)
J2-6 b3 SPARE
a4 Calibration Com-
mand (on = 1) J1-
13 b4 /Store (Frequency
Count)
a5 Remote Dump
J2-14 b5 SPARE
a6 Hold (Freq. Coun-
ter) (a6 = 1) b6 SPARE
a7 MPX (Dump Se-
lect) (1 = FP
Dump) b7 SPARE
PIA #5 (U21) PIA #5 (U21)
a0 LED Driver Mode b0 SU #1 Port J1-28
a1 SPARE J1-10 b1 SU #2 Port J1-30
a2 SPARE J1-12 b2 SU #3 Port J1-30
a3 SPARE J1-8 b3 SU #4 Port J1-34
TABLE 4A.3, CONTD