Macintosh

The Macintosh is a family of computers made by Apple. Its early machines provide a concrete example of integrating a processor, computer memory, a display and pointing-device input into an interactive system. The original 128K model and its 512K successor combined a built-in screen with keyboard and mouse connections; the service manual distinguishes their memory capacities.^[ref]

The early display contained $512\times 342$ pixels. To model a monochrome framebuffer with one bit per pixel, the minimum packed image storage isThat is $21.375\times 1024$ bytes, before any additional image buffers or program data. This is an original storage calculation using the documented display dimensions, rather than a claim about a particular program's memory allocation.^[ref]

The example connects a visible pixel to an addressable representation in computer memory. Drawing a black line requires changing selected bits; a graphical user interface uses such drawing operations to represent controls and documents. Raising either display dimension increases storage even if the processor and the number of values represented per pixel remain unchanged.