In Rainbows
Summary
In Rainbows is a technical specification for devices connected to the ok virtual machine, focusing on memory-mapped I/O and a set of implemented and planned devices (RbConsole, RbArith, RbDisk, RbDatetime, RbScreen). The article outlines memory layouts, how to map RAM to hardware-like interfaces, and design considerations for future devices, including bare-metal goals and potential input/output options. It reads as a developer diary with ongoing evolution and future plans for the project.