A PAL or GAL16V8B that is responsible for generating timing signals for the discrete hardware text plane. Without it, there will be no image. It can also cause memory access issues with the text VRAM.

It can be bypassed at the expense of the text layer by removing the chip, and putting in a jumper between pin 1 and pin 12, which will cause the board to latch the graphics data from the GP9001 custom.

The name "TWIN-CAM" comes from the name printed on the chip in some middle-aged iterations. The name likely alludes to capturing data from two image sources.

Early chips are on PALCE16v8 devices and are unlocked. Later ones are on GAL16V8 devices and are locked. The first GAL16V8 devices have TWIN-CAM printed on them, while later ones do not.

The GAL is registered, soldered to the board, and locked, so it can not be trivially dumped. A replacement has been developed and tested in-circuit.

Pins 13-19 are outputs, while pins 1-9, and 12 are inputs. 11 is /OE and is tied to ground, so it may be ignored. Pin 3 is an inverted clock division fed back into the chip for unknown purposes.

A GAL16V8B located at position U33 on Mahou Daisakusen, Shippu Mahou Daisakusen, Battle Garegga, and probably Armed Police Batrider. This chip is responsible for generating timing signals for the discrete hardware text plane overlay. Without it, there will be no image.

It can be bypassed at the expense of the text layer by removing the chip, and putting in a jumper between pin 1 and pin 12, which will cause the board to latch the graphics data from the GP9001 custom.

The name "TWIN-CAM" comes from the name printed on the chip on Mahou Daisakusen boards. The name likely alludes to capturing data from two image sources.

The GAL is registered, soldered to the board, and locked, so it can not be trivially dumped. A replacement has been developed and tested in-circuit.

Pins 13-19 are outputs, while pins 1-9, and 12 are inputs. 11 is /OE and is tied to ground, so it may be ignored. Pin 3 is an inverted clock division fed back into the chip for unknown purposes.

A GAL16V8B located at position U33 on Mahou Daisakusen, Shippu Mahou Daisakusen, Battle Garegga, and probably Armed Police Batrider. This chip is responsible for generating timing signals for the discrete hardware text plane overlay. Without it, there will be no image.

It can be bypassed at the expense of the text layer by removing the chip, and putting in a jumper between pin 1 and pin 12, which will cause the board to latch the graphics data from the GP9001 custom.

The name "TWIN-CAM" comes from the name printed on the chip on Mahou Daisakusen boards. The name likely alludes to capturing data from two image sources.

The GAL is registered, soldered to the board, and locked, so it can not be trivially dumped. A replacement has been developed and tested in-circuit.

Pins 13-19 are outputs, while pins 1-9, and 12 are inputs. 11 is /OE and is tied to ground, so it may be ignored. Pin 3 is an inverted clock division fed back into the chip for unknown purposes.

A GAL16V8B located at position U33 on Mahou Daisakusen, Shippu Mahou Daisakusen, Battle Garegga, and probably Armed Police Batrider. This chip is responsible for generating timing signals for the discrete hardware text plane overlay. Without it, there will be no image.

It can be bypassed at the expense of the text layer by removing the chip, and putting in a jumper between pin 1 and pin 12, which will cause the board to latch the graphics data from the GP9001 custom.

The GAL is registered, soldered to the board, and locked, so it can not be trivially dumped. A replacement has been developed and tested in-circuit.

Pins 13-19 are outputs, while pins 1-9, and 12 are inputs. 11 is /OE and is tied to ground, so it may be ignored. Pin 3 is an inverted clock division fed back into the chip for unknown purposes.

A GAL16V8B located at position U33 on Mahou Daisakusen, Shippu Mahou Daisakusen, Battle Garegga, and probably Armed Police Batrider. This chip is responsible for generating timing signals for the discrete hardware text plane overlay. Without it, there will be no image.

It can be bypassed at the expense of the text layer by removing the chip, and putting in a jumper between pin 1 and pin 12, which will cause the board to latch the graphics data from the GP9001 custom.

The GAL is registered, soldered to the board, and locked, so it can not be trivially dumped. A replacement has been developed and tested in-circuit.

Pins 13-19 are outputs, while pins 1-9, and 12 are inputs. 11 is /OE and is tied to ground, so it may be ignored. Pin 3 is an inverted clock division fed back into the chip for unknown purposes.

A GAL16V8B located at position U33 on Mahou Daisakusen, Shippu Mahou Daisakusen, Battle Garegga, and probably Armed Police Batrider. This chip is responsible for generating timing signals for the discrete hardware text plane overlay. Without it, there will be no image.

It can be bypassed at the expense of the text layer by removing the chip, and putting in a jumper between pin 1 and pin 12, which will cause the board to latch the graphics data from the GP9001 custom.

The GAL is registered, soldered to the board, and locked, so it can not be trivially dumped. A replacement has been developed and tested in-circuit.

A GAL16V8B located at position U33 on Mahou Daisakusen, Shippu Mahou Daisakusen, Battle Garegga, and probably Armed Police Batrider. This chip is responsible for generating timing signals for the discrete hardware text plane overlay. Without it, there will be no image.

It can be bypassed at the expense of the text layer by removing the chip, and putting in a jumper between pin 1 and pin 12, which will cause the board to latch the graphics data from the GP9001 custom.

The GAL is registered, soldered to the board, and locked, so it can not be trivially dumped. A replacement has been developed and tested in-circuit.