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BMX SERIES III CONSOLE
the cart START and STOP inputs of connector J4, respectively. The resistor and capacitor on each opto-
isolator (i.e., C1/R2 on U1, etc.) slows down the switching time on the opto-isolator's output transistor.
8.5.2 CI-2 Cartridge Interface (+12 to +28 Volt Logic)
The CI-2 Cartridge Interface (PR&E #99-125-0) was designed for use with those commercial cart
machines which use +12 to +28 volt logic. The CI-2 uses dry relay contacts for start and stop functions,
and also serves as a capable logic interface for CD players and cassette machines. The CI-2 also routes
machine status indicator feedback to the console module "OFF" lamp, mimicking machine READY,
PAUSE or STOP indicators.
Each CI-2 can accommodate up to three machines. For a schematic of this interface, as well as a diagram
of the console to interface cable (PR&E #99-38), see Section 8.6.
CIRCUITRY
When a cartridge is inserted, current is fed to isolator circuit CR9-12, R2, R4, C2 and U2, forcing the NOT
READY line low and momentarily pulsing NOT AUDIO reset low (ensuring module turnoff). A START
pulse input via CR1 will turn on relay K1, starting the cartridge machine. Current fed to isolator circuit CR5-
8, R1, R3, C1 and U1 will force the NOT AUDIO RESET line low. A STOP pulse input via CR2 will
turn on relay K2, stopping the cartridge machine.
8.5.3 CI-2 Cartridge Interface (+5 Volt Logic)
The CI-2 Cartridge Interface (PR&E #99-125-1) was designed for use with those commercial cart
machines which use +5 volt logic feedback. Its function is identical to the CI-2 Interface for +12 to +28
volt logic. For a schematic of this interface, as well as a diagram of the console to interface cable (PR&E
#99-38), see Section 8.6.
CIRCUITRY
The circuitry for the +5 volt version of the CI-2 Cartridge Interface functions identically to that of the +12
to +28 volt version (reference Section 8.4.2), except that resistors R3 and R4 are 100 ohm, 1/4 watt, instead
of 1K ohm, 1/2 watt.
8.5.4 TI-2 Tape Interface
The TI-2 Tape Interface (PR&E #99-111) was designed for use with those commercial reel to reel tape
machines which use +12 to +28 volt logic. Each TI-2 accommodates one machine. For a schematic of this
interface, as well as a diagram of the console to TI-2 interface cable (PR&E #99-464), see Section 8.6.
NOTE: This interface may also be used with cartridge machines. In this event, use console to interface
cable #99-38 if the replay lockout function is desired.
REVISION B
210
PACIFIC RESEARCH & ENGINEERING
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