Abstract: In an embodiment, an authentication system includes a supply device having a data storage chip with identification (ID) bit memory cells. The ID bit memory cells comprising a measured cell, pointer cells to store address information that points to the measured cell, and analog cells that store factory-measured analog information about the measured cell.

Abstract: One example discloses a peripheral supply component. The peripheral supply component includes a supply item to provide resources on an installed peripheral component, wherein the supply item is a consumable, upgradable, or replacement component on the installed peripheral component. An encoded component is installed with the supply item, wherein the encoded component is employed to generate a message event related to the peripheral component.

Abstract: A fluid ejection device includes a plurality of analog devices, and a storage element storing an authentication value based on electrical characteristics of a subset of the plurality of analog devices.

Abstract: A fluid ejection device includes a plurality of analog devices, and a storage element storing an authentication value based on electrical characteristics of a subset of the plurality of analog devices.

Abstract: A fluid ejection device includes a plurality of analog devices, and a storage element storing an authentication value including a plurality of bits, a first bit of the plurality of bits based on measured electrical characteristics of a first subset of the analog devices, and a second bit of the plurality of bits based on measured electrical characteristics of a second subset of the analog devices, the second subset different from the first subset.

Abstract: Encryption of fluid cartridges for use with imaging devices is disclosed herein. One disclosed apparatus includes a memory of a fluid cartridge comprising a plurality of sequential bits, where the plurality of sequential bits are written to the memory after the plurality of sequential bits are transformed based on scrambling bits of the plurality of sequential bits, and a memory interface of the fluid cartridge to enable access to the memory to authenticate the fluid cartridge.

Abstract: Encryption of fluid cartridges for use with imaging devices is disclosed herein. One disclosed apparatus includes a memory of a fluid cartridge comprising a plurality of sequential bits, where the plurality of sequential bits are written to the memory after the plurality of sequential bits are transformed based on scrambling bits of the plurality of sequential bits, and a memory interface of the fluid cartridge to enable access to the memory to authenticate the fluid cartridge.

Abstract: A fluid ejection device includes a plurality of analog devices, and a storage element storing an authentication value including a plurality of bits, a first bit of the plurality of bits based on measured electrical characteristics of a first subset of the analog devices, and a second bit of the plurality of bits based on measured electrical characteristics of a second subset of the analog devices, the second subset different from the first subset.

Abstract: One example discloses a peripheral supply component. The peripheral supply component includes a supply item to provide resources on an installed peripheral component, wherein the supply item is a consumable, upgradable, or replacement component on the installed peripheral component. An encoded component is installed with the supply item, wherein the encoded component is employed to generate a message event related to the peripheral component.

Abstract: A print head die includes a storage element. The print head die includes a plurality of analog devices. The storage element is to store an authentication value. The authentication value is generated based on comparisons of the measured electrical characteristics of at least some of the analog devices.

Abstract: One example discloses a peripheral supply component. The peripheral supply component includes a supply item (130) to provide resources on an installed peripheral component (110), wherein the supply item (130) is a consumable, upgradable, or replacement component on the installed peripheral component (110). An encoded component (140) is installed with the supply item (130), wherein the encoded component (140) is employed to generate a message event related to the peripheral component.

Abstract: A print head die includes a storage element. The print head die includes a plurality of analog devices. The storage element is to store an authentication value. The authentication value is generated based on comparisons of the measured electrical characteristics of at least some of the analog devices.

Abstract: An image forming system and methods are disclosed. The methods include detecting an ambient temperature of an image forming system by a first thermal sense resistor disposed in a first printhead to obtain a first detected ambient temperature, detecting the ambient temperature of the image forming system by a second thermal sense resistor disposed in a second printhead to obtain a second detected ambient temperature, and determining a temperature difference between the first detected ambient temperature and the second detected ambient temperature of the image forming system by a temperature variation module.

Abstract: A printing system comprising an electrical interface for ink pens of an inkjet printer, the electrical interface including a first group of electrical contacts; a second group of electrical contacts, the second group of electrical contacts being arranged in an identical configuration as the first group of electrical contacts; and a number of electrical interconnects, in which each electrical contact from the first and second groups of electrical contacts is connected to one of the electrical interconnects via a conductive trace; in which at least one electrical contact from the first group of electrical contacts is connected to a same electrical interconnect as at least one electrical contact from the second group of electrical contacts.

Abstract: A method for tuning ink usage includes storing an ink usage adjustment value in a memory of an ink cartridge; and with a printing system utilizing the ink cartridge, adjusting an ink usage of the ink cartridge based on the ink usage adjustment value. An ink cartridge includes a memory for storing an ink usage adjustment value, the ink usage adjustment value based on ink usage properties of the cartridge. A printing system utilizing the ink cartridge adjusts an ink usage of the ink cartridge based on the ink usage adjustment value.

Abstract: A printing system configured for multi-mode printing, the printing system including a print head, the print head including a number of nozzle pairs, each nozzle pair including a primary ink nozzle and a secondary ink nozzle; and switching circuitry for selectively firing either or both of the nozzles in a selected pair within one of a number of time slots based on a current print mode.

Abstract: In an embodiment, an authentication system includes a base unit to receive a replaceable supply device, a controller integrated into the base unit, known characteristic data accessible by the controller, and an authentication algorithm executable on the controller to authenticate the supply device if a known characteristic measured on the supply device matches the known characteristic data.

Abstract: In an embodiment, an authentication system includes a supply device having a data storage chip with identification (ID) bit memory cells. The ID bit memory cells comprising a measured cell, pointer cells to store address information that points to the measured cell, and analog cells that store factory-measured analog information about the measured cell.

Abstract: One example discloses a peripheral supply component. The peripheral supply component includes a supply item (130) to provide resources on an installed peripheral component (110), wherein the supply item (130) is a consumable, upgradable, or replacement component on the installed peripheral component (110). An encoded component (140) is installed with the supply item (130), wherein the encoded component (140) is employed to generate a message event related to the peripheral component.

Abstract: A consumable product can have an identifier stored on a circuit or machine-readable medium. The identifier can be used to verify the authenticity of the consumable product. The integrity of the identifier can be verified based on an integrity check portion of the identifier.