The real display's power-on test (JP1 jumper 5, firmware $B888) runs through
several drawing sequences — a solid fill, a border+grid, more — each held
briefly, to expose dead dots and addressing faults; it isn't just full on/off.
Both vPLASMA and the replica firmware now cycle 5 representative patterns:
solid, border+grid, horizontal stripes, vertical stripes, checkerboard.
- VPlasmaDevice.ShowTestPattern(int) + TestPatternCount; the app cycles them
on a 1.2s timer while jumper 5 is installed.
- PlasmaDisplay::showTestPattern(int) + TEST_PATTERN_COUNT (shared logic); the
Matrix Portal sketch's DOWN button toggles the cycling test.
(The firmware's exact byte patterns live in the display's native scan-buffer
layout, which we haven't mapped, so these stand in for that sequence rather
than reproducing it byte-for-byte.)
Verified: 29 C# tests pass; the C++ patterns render distinctly on the host.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The hardware replacement for the failing Babcock PD01D221: an Adafruit Matrix
Portal S3 (ESP32-S3) reads the game's serial command stream over its native
USB-CDC port and renders it to two chained Adafruit 64x32 HUB75 RGB panels
(= 128x32) in neon-orange, via Adafruit Protomatter.
- PlasmaDisplay.h/.cpp — the PD01D221 command parser + 128x32 framebuffer,
ported line-for-line from vPLASMA's VPlasmaDevice (the reference oracle):
the full ESC command set, pixel-addressed cursor, attributes, orientation,
and the rotate-onto-glass plot() mapping.
- plasma_fonts.h — the 8 real ROM fonts (PROGMEM), generated from
tms27pc512.BIN.
- demo_screens.h — the 10 firmware demo screens (PROGMEM).
- MatrixPortalPlasma.ino — Protomatter init (128x32), USB serial input,
the orange/dim/blink render loop, and onboard buttons (UP = firmware demo,
DOWN = panel test) for no-host bring-up.
- README.md — BOM, wiring, build/flash, DOSBox-X serial config.
Parser verified on the host with g++ (font-0 'H', ESC Q/R positioning,
demo replay, test pattern) against a minimal Arduino shim.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
CydandClaude Opus 4.8