An image forming apparatus, having a cartridge detachably attached to the image forming apparatus and including a first compartment configured to store a colorant, a container configured to be connected with the cartridge and including a second compartment configured to store the colorant flowing from the cartridge, and a display configured to display a first object indicating a first remainder amount and a second object indicating a second remainder amount in a single screen, is provided. The first remainder amount is a remainder amount of the colorant stored in the first compartment, and the second remainder amount is a remainder amount of the colorant stored in the second compartment.

An image forming apparatus includes: a main casing to which a consumable including a consumable memory is attachable; a main memory; and a controller configured to perform: when the consumable is new, storing identification information of the consumable in the main memory; when the consumable is used and is a special consumable, determining whether the identification information is stored in the main memory; when the identification information is stored in the main memory, permitting use of the consumable; when the identification information is not stored in the main memory; prohibiting use of the consumable; and while an external memory is physically connected to the main casing, storing the identification information in the external memory. By the external memory being physically connected to another image forming apparatus, the another image forming apparatus permits use of the consumable therein on the basis of the identification information stored in the external memory.

A consumable is attachable to a main housing and usable in an image forming apparatus. The consumable contains consumable material. The consumable includes a consumable memory configured to store first remaining amount information. The first remaining amount information indicates a first remaining amount that is a current remaining amount of the consumable material in the consumable. A controller is configured to execute: a first storing process, in a case where the consumable is a contract consumable that is usable when a contract for the image forming apparatus is set, storing a second remaining amount in the consumable memory as the first remaining amount information; and storing a third remaining amount in an apparatus memory. The second remaining amount is a part of the first remaining amount stored in the consumable memory. The third remaining amount is obtained by subtracting the second remaining amount from the first remaining amount.

An image forming apparatus, having a first container with a first compartment, a second container with a second compartment, a recorder, a display, and a controller, is provided. The controller controls the display to display a first screen and a second screen. The first screen contains a first object having a form that reflects an amount of a colorant in the first compartment and a second object having a form that reflects an amount of the colorant in the second compartment. The second screen contains a third object having a form that reflects one of the amount of the colorant in the first compartment, the amount of the colorant in the second compartment, and a total amount of the colorant in the first compartment and the second compartment.

There is provided a liquid supply device including: first and second valves; a head; a suction mechanism; and a controller. The controller is configured to: execute a valve-opening operation of opening the first and second valves, in response to a suction instruction; execute a valve-closing operation of closing the first valve depending on output of a first signal, and closing the second valve depending on output of a second signal, the first signal indicating that an amount of a first liquid in a first tank is a first threshold value or more, the second signal indicating that an amount of a second liquid in a second tank is a second threshold value or more; and execute a suction operation of driving the suction mechanism for a predetermined time period.

An information processing system includes a storage portion, a reception portion, and a processing portion. The storage portion stores a learned model obtained by performing machine learning on a replacement condition of a print head based on a data set in which nozzle surface image information obtained by photographing a nozzle surface of the print head and replacement necessity information representing replacement necessity of the print head or a replacement timing of the print head are associated with each other. The reception portion receives the nozzle surface image information. The processing portion outputs the replacement necessity information of the print head based on the received nozzle surface image information and the learned model.

An example method comprises identifying a plurality of supply levels corresponding to a set of print supplies of a print device. The example method further comprises coordinating depletion of the set of print supplies by selecting between black print and process black print for a print job of the print device based on the plurality of supply levels.

An image processing apparatus detects a change in job information which is information related to an execution of the job, and generates a log related to the processing of the job. In a condition that the job includes a plurality of pages, in a case where the change in the job information is not detected, one log is generated with the job as a unit, and in a case where the change in the job information is detected, a log is generated even during the job based on job information before the change. In a case where the change in the job information is detected at a first point in time, a log is generated as of the first point in time, and in a case where the change from the first point in time in the job information is detected at a second point in time which is a point later than the first point in time, a log from the first point in time to the second point in time is generated.

An image forming apparatus, having a cartridge detachably attached to the image forming apparatus and including a first compartment configured to store a colorant, a container configured to be connected with the cartridge and including a second compartment configured to store the colorant flowing from the cartridge, and a display configured to display a first object indicating a first remainder amount and a second object indicating a second remainder amount in a single screen, is provided. The first remainder amount is a remainder amount of the colorant stored in the first compartment, and the second remainder amount is a remainder amount of the colorant stored in the second compartment.

An image forming apparatus, having a first container with a first compartment, a second container with a second compartment, a recorder, a display, and a controller, is provided. The controller controls the display to display a first screen and a second screen. The first screen contains a first object having a form that reflects an amount of a colorant in the first compartment and a second object having a form that reflects an amount of the colorant in the second compartment. The second screen contains a third object having a form that reflects one of the amount of the colorant in the first compartment, the amount of the colorant in the second compartment, and a total amount of the colorant in the first compartment and the second compartment.