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A soft-core FPGA replica of the Saab CK37 — the world's first IC-based airborne computer, rebuilt from the original 1963 FMV maintenance manual and running a PID navigation loop in the original Q1.25 assembly. Target: OrangeCrab r0.2 (ECP5-25F)
11 starsVerilog
FPGA soft-core of the Saab Viggen's 1963 airborne computer
by FormerLabFred·Mar 20, 2026·22 points·8 comments
AI Analysis
●●●●GemWizardryZero to OneNiche Gem
Original 1963 navigation code runs on FPGA reconstructed from Swedish Air Force manuals.
Strengths
- •Primary source reconstruction from FMV maintenance manuals, not reverse-engineered guesses
- •25/25 tests passing with 8.5× timing margin on ECP5-25F target hardware
- •End goal: autonomous drone navigation using proven 1963 Viggen fighter algorithms
Weaknesses
- •OrangeCrab hardware bring-up still pending, not yet flight-tested in the wild
- •Extremely niche audience at FPGA and aviation history intersection
Category
Target Audience
FPGA developers, aviation historians, embedded systems engineers
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