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ZX Spectrum controls lunar landing in KSP

https://sudonull.com/zx-spectrum-controls-lunar-landing-in-ksp

Learn how ZX Spectrum with Z80A and kRPC implemented landing in Kerbal Space Program. Technical details of emulation, RS232 and comparison with AGC. For developers.

Reversing BCD4 Queue Display Protocol

https://sudonull.com/reversing-bcd4-queue-display-protocol

Analysis of BCD4 encoding and carry-checksum in the electronic queue display protocol. Python code, packet structure, web integration. For developers.

HDMI Matrix in Home Assistant: RS-232 Integration

https://sudonull.com/hdmi-matrix-in-home-assistant-rs-232-integration

Set up TV source switching between rooms via Home Assistant and 4×4 HDMI matrix. Step-by-step code for Coordinator, media_player entity, protocol. For middle/senior dev. Install in 13 min.

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