Radio Shack TRS-80 Model 4 Technical Reference Manual

50
Parts List, CPU PCB 8858090
Model 4 64K, Single or Double Drive
Catalog Number 26-1068 or 26-1069
Item Qty Description Mfgr’s Part No.
37 1 IC, 74LS166 Shift Register (Ull) 8020166
38 2 IC, 74LS51 AND OR Invert (U12,20) 8020051
39 2 IC, 74LS00 Quad 2-In NAND (U13,14) 8020000
40 1 IC, LM339 Comparator (U15) 8050339
41 3 IC, 74LS32 Quad 2-In OR (U16,22,51) 8020032
42 1 IC, 74LS14 Hex Inverter (U17) 8020014
43 3 IC, 74LS174 Flip-Flop (U18,36,42) 8020174
44 1 IC, 74S04 (U19) 8010004
45 1 IC, 4016 200NS RAM 2K X 8 Static (U21) 8040116
46 1 IC, MCM68A316E Character Generator (U23) 8044316
47 1 IC, 74LS86 Quad 2-In OR (U24) 8020086
48 1 IC, 74LS04 Hex Inverter (U25) 8020004
49 3 IC, 74LS08 Quad 2-In AND (U26,46,52) 8020008
50 5 IC, 74LS74 Dual Flip-Flop (U27,31,39,40,53) 8020074
51 1 IC, MC1458 OP-AMP (U28) 80504S8
52 2 IC, 7406 Hex Inverter (U29,30) 8000006
53 1 IC, 74LS10 Triple 3-In NAND (U32) 8020010
54 3 IC, 74LS157 Quad Multiplexer (U33-35) 8020157
55 2 IC, 74LS367 Memory (U38,75) 8020367
56 1 IC, MC1741 OP-AMP (U43) 8050741
57 2 IC, MC14502 B CMOS Driver (U44,45) 8030502
58 1 IC, SY68045 CTC 50Hz Version (U47) 8041045
59 3 IC, 74LS138 Decoder (U48-50) 8020138
60 2 IC, 74LS240 Octal Buffer (U54,60) 8020240
61 1 IC, Z80A CPU (U57) 8047880
62 1 IC, PAL10L8 (U58) 8075208
63 1 IC, PALl6L8 (U59) 8075368
64 1 IC, 7405 O.C. Buffer (U61) 8000005
65 1 IC, 74LS02 Quad 2-In NOR (U62) 8020002
66 2 IC, 74157 Quad Multiplexer (U63,76) 8000157
67 1 IC, 74LS123 Dual Multivibrator (U65) 8020123
68 1 IC, 74LS374 Octal Flip-Flop (U66) 8020374
69 1 IC, MCM68A364 ROM A (U68) 8048364
70 1 IC, MCM68A332 ROM B (U69) 8040332
71 1 IC, MCM68A316 ROM C (U70) 8042316
72 2 IC, 74LS245 Octal Tranceiver (U71,73) 8020245
73 1 IC, DIP Shunt 4-Pos. (U72) 8489057
74 8 IC, MCM6665 64K RAM 200NS (U85-92) 8040665
75 1 IC, 74LS30 Positive NAND (U93) 8020030
76 1 Relay, 12V 2 Amp (Kl) 8429105
77 2 Res, 510 ohm, 5% 1/4W (R1,59) 8207151
78 1 Res, 12K ohm, 5% 1/4W (R2) 8207312
79 1 Res, 6.2K ohm, 1/4W (R3) 8207262
80 2 Res, 470 ohm, 5% 1/4W (R4,23) 8207147

Radio Shack TRS-80 Model 4 Specifications

General

Brand	Radio Shack
Model	TRS-80 Model 4
Category	Desktop
Language	English