X0201 4 2004-04-08 1 0000853695 DIGITAL RECORDERS INC TBUS 0001276530 TRANSIT VEHICLE TECHNOLOGY INVESTMENTS INC 0 0 1 0 0001277214 CHU Y PING 3306 KINGSTON DR RICHARDSON TX 75082 0 0 1 0 Common Stock 2004-04-08 4 S 0 1600 8.28 D 423100 D Common Stock 2004-04-08 4 S 0 300 8.3 D 422800 D Common Stock 2004-04-08 4 S 0 200 8.31 D 422600 D Common Stock 2004-04-08 4 S 0 300 8.32 D 422300 D Common Stock 2004-04-08 4 S 0 200 8.42 D 422100 D Common Stock 2004-04-08 4 S 0 2000 8.72 D 420100 D Common Stock 2004-04-08 4 S 0 7000 8.75 D 413100 D Common Stock 2004-04-08 4 S 0 2400 8.77 D 410700 D Common Stock 2004-04-08 4 S 0 2600 8.78 D 408100 D Common Stock 2004-04-08 4 S 0 1000 8.79 D 407100 D Common Stock 2004-04-08 4 S 0 1000 8.82 D 406100 D Common Stock 2004-04-08 4 S 0 3000 8.84 D 403100 D Common Stock 2004-04-08 4 S 0 3200 8.85 D 399900 D Common Stock 2004-04-08 4 S 0 2800 8.86 D 397100 D Common Stock 2004-04-08 4 S 0 5990 8.87 D 391110 D Common Stock 2004-04-08 4 S 0 1000 8.88 D 390110 D Common Stock 2004-04-08 4 S 0 1100 8.89 D 389010 D Common Stock 2004-04-08 4 S 0 11110 8.9 D 377900 D Common Stock 2004-04-08 4 S 0 1000 8.91 D 376900 D Common Stock 2004-04-08 4 S 0 2000 8.92 D 374900 D Common Stock 2004-04-08 4 S 0 1000 8.93 D 373900 D Common Stock 2004-04-08 4 S 0 1000 8.95 D 372900 D Common Stock 2004-04-08 4 S 0 300 8.99 D 372600 D Common Stock 2004-04-08 4 S 0 7500 9 D 365100 D Common Stock 2004-04-08 4 S 0 1400 9.01 D 363700 D Common Stock 2004-04-08 4 S 0 1000 9.05 D 362700 D Common Stock 2004-04-08 4 S 0 600 9.06 D 362100 D Common Stock 2004-04-08 4 S 0 500 9.08 D 361600 D Common Stock 2004-04-08 4 S 0 1500 9.09 D 360100 D Common Stock 2004-04-08 4 S 0 2500 9.12 D 357600 D By: /s/ Damon D. McDonald, Chief Operating Officer, on behalf of Transit Vehicle Technology Investments Inc. 2004-04-13 By: /s/ Damon D. McDonald, by power of attorney, on behalf of Y-Ping Chu 2004-04-13