gnw-zelda-microsd-kicad

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README

GnW-Zelda-MicroSD

A castellated-edge microSD interposer for the Game & Watch: The Legend of Zelda console mod scene -- built as original KiCad artwork, informed by existing community Gerber-only releases rather than copied from any of them.

The board mates directly to the console's STM32 mainboard via a 7-position castellated edge (real 0.3x1.2mm SMD pad geometry, machined flush by the board-edge mill -- this is the critical mechanical/electrical mating surface, not an approximation) and carries an onboard RT9193-28GB LDO regulating the console's raw ~4.2V battery rail down to a safe 2.8V for the microSD card.

This is a flex PCB, not rigid: 2-layer, 1oz copper both sides on a 2mil (50.8um) polyimide core, 0.1408mm total board thickness.

Status

Working draft, not yet fab-verified on real hardware. Electrically clean (0 unconnected nets, 0 shorts per kicad-cli pcb drc) with real routing and filled ground pours on both copper layers. Remaining DRC output is DFM-grade (clearances, drill sizes, silk overlap) -- normal manual-review territory before ordering boards, not electrical faults. See docs/design-notes.md for the full derivation, findings, and everything still worth double-checking by hand in the KiCad GUI before fabrication.

Commit history

Initial commit -- the original reconstruction: schematic, PCB, footprints, and silkscreen rebuilt from scratch in KiCad from measured Gerber geometry (see Origin and attribution below). No third-party KiCad source files were used at this point -- every footprint was RE'd/approximated by hand from pad positions and sizes read off the Gerbers.
This commit -- incorporates real assets from PrimoAngelo's native KiCad source (added as source material in the prior commit) now that he's confirmed as the known-good original author: J2 (microSD socket) and J3 (VBAT tab) were swapped from their RE'd/approximated footprints to his real MSD1A/Pad_1x1_5 pad geometry, and a real STEP model was wired into U1 (RT9193 LDO). C1/C2/R1 now carry a second, real hand-solder-0805 footprint stacked at the same location as their original passive footprint, so either package size can be assembled. Also fixed a schematic/PCB reference-designator mismatch (J2/J3 and U1/U2 were swapped between the two files) and a batch of inconsistent net names left over from re-syncing the PCB against the schematic.

Repository layout

Comments

GnW-Zelda-MicroSD

This is a flex PCB, not rigid: 2-layer, 1oz copper both sides on a 2mil (50.8um) polyimide core, 0.1408mm total board thickness.

Status

Commit history

Initial commit -- the original reconstruction: schematic, PCB, footprints, and silkscreen rebuilt from scratch in KiCad from measured Gerber geometry (see Origin and attribution below). No third-party KiCad source files were used at this point -- every footprint was RE'd/approximated by hand from pad positions and sizes read off the Gerbers.

This commit -- incorporates real assets from PrimoAngelo's native KiCad source (added as source material in the prior commit) now that he's confirmed as the known-good original author: J2 (microSD socket) and J3 (VBAT tab) were swapped from their RE'd/approximated footprints to his real MSD1A/Pad_1x1_5 pad geometry, and a real STEP model was wired into U1 (RT9193 LDO). C1/C2/R1 now carry a second, real hand-solder-0805 footprint stacked at the same location as their original passive footprint, so either package size can be assembled. Also fixed a schematic/PCB reference-designator mismatch (J2/J3 and U1/U2 were swapped between the two files) and a batch of inconsistent net names left over from re-syncing the PCB against the schematic.

Repository layout

gnw-zelda-microsd-kicad

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