Abstract: A logic circuitry package for a replaceable print apparatus component includes an interface to communicate with a print apparatus logic circuit and at least one logic circuit to transmit, via the interface, a limit parameter and a count threshold parameter. The logic circuit is to receive, via the interface, initial requests to read sensor IDs with the component connected to the apparatus and the apparatus not pneumatically actuating the component. The logic circuit is to transmit, via the interface, a resting state digital value in response to each initial request. The logic circuit is to receive, via the interface, further requests to read the sensor IDs with the component connected to the apparatus and the apparatus pneumatically actuating the component. The logic circuit is to transmit, via the interface, a further digital value in response to each further request.

Abstract: An integrated circuit for a replaceable print apparatus component comprising a communication interface to communicate with a print apparatus logic circuit over the bus, and at least one logic circuit.

Abstract: A logic circuitry package for a replaceable print apparatus component includes an interface to communicate with a print apparatus logic circuit, and at least one logic circuit to receive, via the interface, requests corresponding to different sensor IDs with the component connected to the apparatus. The logic circuit is to transmit, via the interface, a digital value in response to each request. The digital values corresponding to the different sensor IDs are distinct.

Abstract: A logic circuit for a replaceable print component is configured to, in response to a plurality of commands including a first command specifying the new I2C communications address and a first calibration parameter, a second command specifying the new I2C communications address and a second calibration parameter, a third command specifying the new I2C communications address and a class parameter, and/or fourth commands specifying the new I2C communications address and sub-class parameters, and at least one read request, generate count values in a count value range defined by a highest and lowest count value.

Abstract: In an example, a method includes, by logic circuitry associated with a replaceable print apparatus component installed in a print apparatus, responding to a sensor data request received from the print apparatus by returning a first response; receiving a calibration parameter from the print apparatus; and returning a second response which is different from the first response.

Abstract: Disclosed herein are sensor circuits for a replaceable print material container, the sensor circuit to communicate with a printer logic circuit. An example sensor circuit includes a first sensor to detect at least one of a pneumatic stimulus or a pressurization applied by a printer, a second sensor, and an interface to communicate with at least one of a voltage source or a data source of the printer logic circuit. The example sensor circuit also includes logic circuitry, responsive to a class parameter, to: (a) output a first signal based on at least one of the pneumatic stimulus or the pressurization sensed by the first sensor when the class parameter is a first class parameter; and (b) output a second signal based on at least one of an output of the second sensor, different data, or a different algorithm when the class parameter is a second class parameter.

Abstract: A sensor circuit for a replaceable print apparatus component comprises an interface to transmit signals with respect to a print apparatus logic circuit, and further comprises, connected to the interface, at least two sensor cell arrays, each array including nominally the same cells, the cells of one array being nominally different than the cells of the other array, and at least one single cell sensor that is nominally different than the other cells.

Abstract: In an example, a method comprises, by logic circuitry associated with a replaceable print apparatus component installed in a print apparatus, receiving a sensor data request and determining whether the request is for data indicative of a print material level or for data indicative of a pressurisation event. In the event that the request is a request for data indicative of the print material level, the method may comprise responding with a first data response in a first value range; and in the event that the request is a request for data indicative of a pressurisation event, the method may comprise responding with a second data response in a second value range.

Abstract: A logic circuit for a replaceable print component is configured to, in response to a plurality of commands including a first command specifying the new I2C communications address and a first calibration parameter, a second command specifying the new I2C communications address and a second calibration parameter, a third command specifying the new I2C communications address and a class parameter, and/or fourth commands specifying the new I2C communications address and sub-class parameters, and at least one read request, generate count values in a count value range defined by a highest and lowest count value.

Abstract: A sensor circuit for a replaceable print material container to be connected to a host print apparatus logic circuit comprising a first sensor to detect a pneumatic stimulus or pressurization applied by a print apparatus, and an interface including contact pads to connect to a voltage and/or data source of the print apparatus logic circuit, the sensor circuit configured to output signals conditioned by the pneumatic stimulus or pressurization via the contact pads.

Abstract: A sensor circuit for a replaceable print material container to be connected to a host print apparatus logic circuit comprising a first sensor to detect a pneumatic stimulus or pressurization applied by a print apparatus, and an interface including contact pads to connect to a voltage and/or data source of the print apparatus logic circuit, the sensor circuit configured to output signals conditioned by the pneumatic stimulus or pressurization via the contact pads.

Abstract: A logic circuit for a replaceable print component is configured to, in response to a plurality of commands including a first command specifying the new I2C communications address and a first calibration parameter, a second command specifying the new I2C communications address and a second calibration parameter, a third command specifying the new I2C communications address and a class parameter, and/or fourth commands specifying the new I2C communications address and sub-class parameters, and at least one read request, generate count values in a count value range defined by a highest and lowest count value.

Abstract: In one example, a liquid delivery and gas removal system for a printhead. The system includes a pump to provide a liquid at a positive pressure. The system also includes a filter fluidically coupled to the pump to receive the pressurized liquid at an upstream side, at a first pressure push the liquid through the filter to a downstream side, and at a higher second pressure push gas bubbles in the liquid through the filter to the downstream side. The system further includes a vent having a gas-permeable membrane. A wet side of the membrane is fluidically coupled to the downstream side and to a printhead. A vacuum is applied to a dry side of the membrane.

Abstract: In some examples, a fluid ejection assembly is removably mountable in a system, and includes a fluid ejection device, and a removable frame on which the fluid ejection device is mounted. The removable frame includes a plurality of fluid interface members that share a common design to releasably engage with a plurality of fluid interface connectors together as the removable frame is brought into engagement with a support structure in the system and on which the plurality of fluid interface connectors are mounted. Engagement of a first fluid interface member with a first fluid interface connector establishes a gas path through the first fluid interface member and the first fluid interface connector, and engagement of a second fluid interface member with a second fluid interface connector establishes a liquid path through the second fluid interface member and the second fluid interface connector, the liquid path to deliver a liquid to the fluid ejection device.

Abstract: A logic circuit for a replaceable print component is configured to, in response to a plurality of commands including a first command specifying the new I2C communications address and a first calibration parameter, a second command specifying the new I2C communications address and a second calibration parameter, a third command specifying the new I2C communications address and a class parameter, and/or fourth commands specifying the new I2C communications address and sub-class parameters, and at least one read request, generate count values in a count value range defined by a highest and lowest count value.

Abstract: An example apparatus includes a housing including a first chamber and a second chamber, the housing defining a first port to fluidly couple the first chamber to a printer, the housing including a second port to fluidly couple the first chamber and the second chamber; a bladder disposed in the first chamber, the bladder being inflatable to increase a pressure within the first chamber; and a regulator to regulate fluid flow from the second chamber to the first chamber and to deter fluid flow from the first chamber to the second chamber.

Abstract: An example pen housing includes a first regulator to actuate in response to a first pressure change to enable gas within a first chamber to flow from the first chamber to a second chamber, the first chamber to flow ink to a printhead, the second chamber not to receive ink directly from an ink supply; and a second regulator to actuate in response to a second pressure change to enable the gas received from the first chamber to be discharged from the second chamber.

Abstract: Example continuous ink supply apparatus, systems and methods are disclosed. An example apparatus includes a housing; a printhead; and a regulator including a lever, a spring coupling the lever to the housing, a bladder, and a valve, a position of the lever relative to the housing being controlled by the bladder, the bladder being inflatable to urge the lever away from a surface of the housing and a plug of the valve to move away from a valve seat to enable fluid to flow through the aperture and into the housing, the regulator to enable a pressure within the housing to be maintained below a threshold pressure to substantially prevent fluid from inadvertently dispensing from the printhead.

Abstract: An example pen housing includes a first regulator to actuate in response to a first pressure change to enable gas within a first chamber to flow from the first chamber to a second chamber, the first chamber to flow ink to a printhead, the second chamber not to receive ink directly from an ink supply; and a second regulator to actuate in response to a second pressure change to enable the gas received from the first chamber to be discharged from the second chamber.

Abstract: An example apparatus includes a housing including a first chamber and a second chamber, the housing defining a first port to fluidly couple the first chamber to a printer, the housing including a second port to fluidly couple the first chamber and the second chamber; a bladder disposed in the first chamber, the bladder being inflatable to increase a pressure within the first chamber; and a regulator to regulate fluid flow from the second chamber to the first chamber and to deter fluid flow from the first chamber to the second chamber.