Iorq
Tri-state output, active low. The IORQ signal indicates that the lower half of the address bus holds a valid I O address for a I O read or write operation. An IORQ signal is also generated with an M1 signal when an interrupt is being acknowledged to indicate that an interrupt response vector can be placed on the data bus. Interrupt Acknowledge operations occur during M, time while I O operations never occur during M, time. RD Tri-state output, active low. RD indicates that the CPU wants to read...
Selftest
Slide switches are provided to make the game run a Self-T st on itself. The SELF-TEST SWITCHES are located on a mounting bracket on the inside left hahd side of the coin door. When in the Self-Test mode, the monitor screen will display the results of certain test functions it has run on itself. These will be discussed in more detail later. The control panel is held in place by three latches, one on the left side, one on the right side, and one in the center of the front of the cabinet. They are...
4c
' If a bad ROM or RAM chip is found by the games internal check system during the Self-Test, the game indicates this to you by showing the P.C. Board location code of the bad chip s in place of the letters OK To check your game function.switches and buttons coin counter switches, SUPER SPEED Button, 1 PLAYER and 2 PLAYER buttons, etc. activate each one while the game is in the Self-Test mode. You should hear a game sound for each button or switch activated. If you do not hear it, the switch...
Part No M05100316a011
When the cabinet access door s are secured in piace, the SAFETY INTERLOCK SWITCH plunger s are in a fuliy depressed condition. The game circuit can function normally. When any cabinet access door s are opened, the SAFETY INTERLOCK SWITCH plunger s are in a partially extended condition. This isolates the game circuit from the line voltage. To restore power to the game circuit with the access door s open, gently pull the SAFETY INTERLOCK SWITCH plunger s out to the fully extended condition. THIS...