EXHIBIT 23.01 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (File Nos. 33-35281, 33-48626, 33-70494, 33-82438, 333-1145, 333-12799, 333-64673) of Integrated Systems, Inc. of our reports dated March 25, 1999, relating to the consolidated financial statements and financial statement schedule which appear in this Form 10-K. PricewaterhouseCoopers LLP San Jose, California May 26, 1999