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>
CydandClaude Opus 4.8
ebad6ee5fe