Abstract: In an example, a method comprises, by logic circuitry associated with a replaceable print apparatus component, responding to a first validation request sent via an I2C bus to a first address associated with the logic circuitry with a first validation response; and responding to a second validation request sent via the I2C bus to a second address associated with the logic circuitry with a second validation response.

Abstract: In an example implementation, a print supply cartridge comprises a microcontroller to receive a timing challenge and enable authentication of the cartridge by providing a challenge response. The challenge response is provided in a challenge response time that falls within an expected time window.

Abstract: An example print supply includes a non-transitory computer-readable medium. The non-transitory computer-readable medium includes data. The data includes an indication of a schema for the data. The data also includes an indication of an identifier. The data includes an indication of a digital signature. The digital signature is usable to authenticate a type of the data, the schema, and the identifier. The print supply also includes a communication interface. The communication interface is to output the data from the non-transitory computer-readable medium.

Abstract: Examples for cost generation for a common print substance supply are described herein. In some examples, signals indicative of an amount of print substance consumed by a plurality of printing devices are received at a computing device. Signals indicative of a cost corresponding to the amount of print substance consumed by each printing device of the plurality of printing devices are generated at a processor of the computing device based on the received signals. The cost is also generated based on a device identifier, a customer identifier, a print media identifier, or a combination thereof. The signals indicative of the cost for each printing device are transmitted.

Abstract: Examples for determining printing device functionality based on consumption and payment are described herein. In some examples, signals indicative of an amount of utilized print consumable by a printing device and signals indicative of payment for the amount of utilized print consumable are received at a computing device. Signals to cause the printing device to alter a functionality based on the signals indicative of an amount of utilized print consumable and the signals indicative of payment for the amount of utilized print consumable are transmitted by the computing device.

Abstract: In an example, a logic circuitry package is configured to be addressable via a first address and at least one second address and comprises a first logic circuit. The first address may be an address for the first logic circuit, and the package may be configured such that, in response to a first command indicative of a first command time period sent to the first address, the package is accessible via at least one second address for a duration of the first command time period; and in response to a second command indicative of a second command time period sent to the first address, the first logic circuit is to, for a duration of the second command time period, disregard traffic sent to the first address.

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 print apparatus component includes an interface to communicate with a print apparatus logic circuit, and at least one logic circuit. The at least one logic circuit is configured to receive, via the interface, a command series addressed to a first default address and a second default address, and transmit, via the interface, at least one response in response to at least one command of the command series. The at least one logic circuit is configured to receive, via the interface, an other command series addressed to an other first default address and subsequently, the second default address, and transmit, via the interface, at least one other response in response to at least one other command of the other command series.

Abstract: In one example, an article for a replaceable printer component includes an integrated circuit device having a device controller, a conductor to supply power to the device controller and to carry a signal to and from the device controller, and a sensor operatively connected to the device controller to sense a voltage and/or a frequency on the conductor. The device controller to send an indication of a sensed voltage and/or a sensed frequency to the printer controller.

Abstract: An example print supply includes a non-transitory computer-readable medium. The non-transitory computer-readable medium includes data. The data includes an indication of a schema for the data. The data also includes an indication of an identifier. The data includes an indication of a digital signature. The digital signature is usable to authenticate a type of the data, the schema, and the identifier. The print supply also includes a communication interface. The communication interface is to output the data from the non-transitory computer-readable medium.

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 implementation, a print supply cartridge comprises a microcontroller to receive a timing challenge and enable authentication of the cartridge by providing a challenge response. The challenge response is provided in a challenge response time that falls within an expected time window.

Abstract: In an example implementation, a print supply cartridge comprises a microcontroller to receive a timing challenge and enable authentication of the cartridge by providing a challenge response. The challenge response is provided in a challenge response time that falls within an expected time window.

Abstract: In an example implementation, a print supply cartridge comprises a microcontroller to receive a timing challenge and enable authentication of the cartridge by providing a challenge response. The challenge response is provided in a challenge response time that falls within an expected time window.

Abstract: A print substance cartridge for a printing device includes a supply of print substance for the printing device, a non-volatile memory, and logic. The memory store authentication values by which the print substance cartridge is authenticated by the printing device, and/or a cryptographic key from which authentication values are able to be generated within the print substance cartridge. The memory stores hash values corresponding to authentication values and by which the authentication values are verified by the printing device. The logic is to, in response to a request from the printing device for an authentication value, provide the requested authentication value to the printing device. The logic is to, in response to a request from the printing device for the hash value corresponding to the authentication value, provide the hash value corresponding to the authentication value to the printing device.

Abstract: In an example implementation, a print supply cartridge comprises a microcontroller to receive a timing challenge and enable authentication of the cartridge by providing a challenge response. The challenge response is provided in a challenge response time that falls within an expected time window.

Abstract: In an example, replaceable print apparatus component authentication apparatus comprises a memory and circuitry. An electrical characteristic of the circuitry may be variable in response to a stimulus, and the memory may store data indicative of an expected variation in the electrical characteristic in response to the stimulus which is associated with a variation in capacitance.

Abstract: A non-transitory memory storing a digital signature of a consumable product where the digital signature indicates that an identifier and host device setting data are from a trusted source.

Abstract: In an example, a logic circuitry package has a first address and comprises a first logic circuit. In some examples, the first address is an I2C address for the first logic circuit, and the package is configured such that, in response to a first command indicative of a task and a first time period sent to the first address, the first logic circuit is to, for a duration of the time period, perform a task, and disregard I2C traffic sent to the first address.

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.