Operator documented the physical VDB + companion card: Jaton KY2-JAX-CVGA54PCI
(Cirrus CL-GD5434) feeds a 26-pin feature-connector ribbon to an AMD/Lattice
MACH130-15JC CPLD (the ISA 0x300-0x31A port decoder + hardwired byte-lane
splitter), which drives 3x Brooktree Bt477KPJ80 RAMDACs -> one VGA stream to
the color radar + a DB25 fan-out to the 5 mono MFDs. Confirms the RE (3 DACs =
3 palette groups; Bt477 6-bit DAC = the driver's shr al,2). A component tied in
parallel to the PC front-panel reset (remote reboot or VDB known-state on
reset) is under operator research. Also: RP uses the FULL 640x480 on all 6
displays (so our top-strip decode = a framebuffer READ bug, stride/page, not
sparse RP content).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
CydandClaude Fable 5
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