iii
LIST OF FIGURES
Fig. No. Description Page No.
1-1 TRS-80 Model 4 Interconnection Diagram 4
3-1 Model 4 Block Diagram 16
3-2 RAM Memory 20
3-3 Timing of U3 & CPU 23
3-4 Timing of U4 24
3-5 CPU Video Access Timing 25
3-6 I/O Bus Timing Diagram 27
4-1 Write Precompensation Timing 65
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