Here are the three #BarrenPlanet campaigns running on a Hewlett Packard #hp100lx. You can download the game from https://cyningstan.itch.io/barren-planet, where you will find links to the two DLC campaigns. #hp200lx #msdos #cga

Incongruously for a #z80 powered device, the #MailStation is heavily GUI based. There isn't a putc function, or even a fixed-width font, in the firmware. Instead, a windowing toolkit and a selection of widgets are provided, and loadable apps are expected to be event-driven. Each app supplies a main event handler function responding to incoming signals such as init, draw, and keydown. Apps don't take over the whole system as typical on single tasking retrocomputers. While the Mailstation doesn't do true multitasking, (or even #HP200LX-like switching between paused apps!), the event-driven software architecture is helpful for battery life, as the CPU can spend most of its time halted waiting for interrupts.

Incongruously for a #z80 powered device, the #MailStation is heavily GUI based. There isn't a putc function, or even a fixed-width font, in the firmware. Instead, a windowing toolkit and a selection of widgets are provided, and loadable apps are expected to be event-driven. Each app supplies a main event handler function responding to incoming signals such as init, draw, and keydown. Apps don't take over the whole system as typical on single tasking retrocomputers. While the Mailstation doesn't do true multitasking, (or even #HP200LX-like switching between paused apps!), the event-driven software architecture is helpful for battery life, as the CPU can spend most of its time halted waiting for interrupts.