Texas Instruments 99/4A - Page 16

ITEMS TO CHECK DURING DEBUG
1 - check : if front PANEL IS UP "TI LOGO"
2 - CHECK +5, +12 VOLT LEVELS THROUGHOUT BOARDS
3 - CHECK IF READY PIN 62 OF 9900 IS LOCKED UP
4 - CHECK THE FOUR 12 VOLT CLOCKS FROM 74362 TO 9900
S - CHECK
GROM SELECT PIN 10 0430
GROM READY PIN 15 0430
GROM CLOCK PIN 13 0430
6 - CHECK. PIN 38 OF 9918 FOR 3.579548 MHz CLOCK
NOTE: SYSTEM WILL RUN WITH CLOCK FROM .3.579520 MHz TO 3.579548
MHz
7 - CHECK VDP (9918) READ PIN 15 9918
WRITE PIN 14 9918
8 - CHECK DATA OUT OF 4116 RAM PIN 14
9 - CHECK COMPOSITE VIDEO FROM PIN CONNECTOR
8