System information

! Three test points: TP1 = 5vdc; TP2 = Signal Ground; TP3 =
Earth Ground
Configuration:
The IOB Card does not require any configuration prior to installation.
Serial ID Chip (U6):
The Serial ID chip is used for software protection. Game software will not
run unless a unique identification code between the software and ID chip
matches. This prevents operation of software that might damage the
machine and protects against unauthorized software duplication.
Watchdog Software and Circuit:
IOB software versions 1.34 and greater incorporated a watchdog routine.
This routine will watch the state of the parallel port bus on the Mainboard. If
there is a period of inactivity longer that two minutes the software assumes
the machine is locked up (or failed to completely boot up) and issues a reset
signal to the Mainboard. The machine will then reboot.
There are times when the technician will need to disable the watchdog.
Pressing the Test/Setup Switch on the IOB Board any time during the boot
up process (before the game software runs), will disable the watchdog. The
flashing light on the IOB Board will blink slower, indicating the watchdog is
disabled. Rebooting the machine (turning it off and then on) will restore the
watchdog to its normal state.
Sound Card
The sound card is a Sound Blaster model CT4180 or equivalent. All game
sounds are software generated. The sound card provides direct output to
the machine’s two internal speakers. External (amplified) speakers can be
used by connecting them to the same jack used for the internal speakers.
Configuration:
Output jumpers must be set on the sound card to “Speaker Out.” Refer to
the manufacturer’s literature shipped with each machine for jumper location
and settings.
Technical Description
T2.5