# Retro Card Reader Repurposed for Solar System Guide

A 1990s TRANZ 330 credit card reader was repurposed into a solar system guide. It uses GPS and thermal printing to show planet positions. Source code is available and shared by [CharlesD].

https://hackaday.com/2026/10/27/2026-retrocomputing-challenge-explore-space-with-a-credit-card-reader/

Image: https://hackaday.com/wp-content/uploads/2026/10/z80planets_feat.jpg?w=800

Image: https://hackaday.com/wp-content/uploads/2026/10/z80planets_detail.jpg?w=400

Image: https://hackaday.com/wp-content/uploads/2026/08/RetroComputing_728x90.jpg

#retrocomputing #gps #z80 #telescope

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Canonical URL: https://qwibbit.com/q28910

Created: 2026-10-27T20:15:26.624671+00:00

Last edited: 2026-10-27T20:15:26.624671+00:00

Board: 3

Origin: Syndicated

Original source: https://hackaday.com/2026/10/27/2026-retrocomputing-challenge-explore-space-with-a-credit-card-reader/