Radio Shack TRS-80 Service Manual page 27

RESISTORS
Ref.No. Value (ohms)
R1 100
R2 3.9K
R3 1.5K
R4 10K
R5 15K
R6/7 10K
R8/9 4.7K
R10 75K
R11 24K
R12 220
R13 8.2K
R14 6.8K
R15/16 56K
R17 15K
R18 1.5M
R19 4.7K
R20 10K x 8
R21 4.7K
R22/23 4.7K
R24 100K
R25 4.7K
R26 100K
SWITCHES
Ref. No.
S1 RESET SW
S2 POWER SW
S3 CHANNEL SW
INTEGRATED CIRCUITS
Ref. No.
U1 MC6803G or (MCU)
HD6803P
U2 SN74LS373N or (D-LATCH)
MB74LS373M
U3 MB8364M (MASK ROM)
U4 SN74LS155N or (DECODER)
MB74LS155M or
HD74LS155P
U5/6 SN74LS367AN or (DRIVER)
MB74LS367AM or
HD74LS367AP
U7 SN74LS245N or (TRANSCEIVER)
MB74LS245M
Wattage
Tolerance ( %)
1/2 ±5
1/6 ±5
1/6 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/6 ±5
1/6 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/4 ±5
1/6 ±5
1/4 ±5
1/4 ±5
1/4 ±5
Description
Description
R/S Part No.
R/S Part No.
R/S Part No.
– 27 –
Material
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Carbon
Resistor Array
Carbon
Carbon
Carbon
Carbon
Carbon
Mfr's Part No.
187010040A
183110240A
183110280A
Mfr's Part No.
MOTOROLA
HITACHI
MOTOROLA
FUJITSU
FUJITSU
MOTOROLA
FUJITSU
HITACHI
MOTOROLA
FUJITSU
HITACHI
MOTOROLA
FUJITSU