The VDB device was only logging the splitter-clock strobe; the gauge code's
palette writes were hitting the handler but being dropped. Cause: I mapped the
palette register groups at Adam's base offsets (0x300/0x308/0x310, sub 0-3),
but per L4VB16.CPP's "+2" convention and L4SVGA16.ASM SVGAWriteFullPalette
(mov dx,base; add dx,2 -> write-addr; inc dx -> data) the real registers are
at base+2: secondary 0x302-0x305, aux1 0x30A-0x30D, aux2 0x312-0x315, VGA-DAC
layout within each (0 mask, 1 read-addr, 2 write-addr, 3 data).
With the offsets corrected the device now captures the full palettes -- e.g.
"VDB pal0 loaded 768 data bytes" (256 RGB) + pal1 -- the per-display color
maps the VDB uses to colorize each of the six monitors. Foundation for
reconstructing the individual displays.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
CydandClaude Opus 4.8
6b62bf9613
