•/PC
M/PC is a concatenative operating system for Varvara, inspired by Openfirmware, designed to manage files on system without a file browser. It uses the postfix notation, meaning that the function success their operands:
Files can store reusable sequences of commands, the tilde prefix includes the content of the file:
The interface uses a single prompt at the top of the screen to input commands:
Controls
The operating system can be used largely without a keyboard to navigate folders and launch roms:
left/right Navigate Stack
up/down Scroll Stack
A Evaluate Selected Symbol
B Directory/Back
Kiosk
To start M/PC as a BIOS rom so that when the user presses F4, Varvara returns to the BIOS instead of triggering a reboot, launch with arguments:
Wallpaper
On boot, M/PC will try and draw an ICN file named wallpaperWWxHH.icn, where WW is the width of the screen divided by 8 in hexadecimal, and HH the height.
Reference
Here is the list of all primitives:
Source, Latest
Repository
Support:
Manifest
Theme
Snarf
incoming: 2026