Texas Instruments 99/4A - Page 15

SYSTEM POWER UP
POWER IS TURNED ON:
• 9900 CPU RESETS AND ADDRESSES LOW ROM LOCATIONS
■ 9900 INITIALIZES
• 99O0 SETS UP WORKSPACE REGISTERS IN 6810 RAM
■ 9900 BEGINS READING FROM GROMS
• 9900 ENTERS TIME DELAY LOOP TO ALLOW STABILIZATION - SEC
■ 9919 SOUND CHIP IS TURNED OFF
■ 9918 VDP IS INITIALIZED
■ 4116 RAM IS CLEARED - REQUIRES APPROXIMATELY 1 SEC
■ FRONT PANEL DISPLAY IS WRITTEN INTO VDP
■ 9919 SOUND CHIP EMITS BEEP
• 99OO CPU ENTERS KEYBOARD SCAN ROUTINE
SYSTEM IS NOW READY FOR USER INPUT
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