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README.video-debug-overlay.md
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@ -26,6 +26,33 @@ Then, an at (@) sign followed by the video start address in hexadecimal. This re
This format may change as needed for some machine types.
# M_ video modes
M_CGA2: 640x200 2-color CGA graphics mode. EGA/VGA emulation will never show this value.
M_CGA4: 320x200 4-color CGA graphics mode. EGA/VGA emulation will never show this value.
M_EGA: EGA/VGA 16-color planar graphics mode. Not SVGA modes.
M_EGA (CGA4): EGA/VGA emulation of CGA 320x200 4-color graphics mode.
M_EGA (CGA2): EGA/VGA emulation of CGA 640x200 2-color graphics mode.
M_VGA: VGA 256-color graphics mode. Not SVGA modes.
M_LIN4: SVGA 16-color planar graphics mode. This usually means the 256K memory wraparound is disabled.
M_LIN8: SVGA 256-color graphics mode. This usually means the 256K memory wraparound is disabled.
M_LIN15: Highcolor 15bpp graphics mode. 16 bits per pixel, only the low 15 bits are used for 5-bit R/G/B.
M_LIN16: Highcolor 16bpp graphics mode. 16 bits per pixel. 5-bit Red and Blue, 6-bit Green.
M_LIN24: Truecolor 24bpp graphics mode. 24 bits per pixel. 8-bit R/G/B. Once used in the 1990s, no longer common since.
M_LIN32: Truecolor 32bpp graphics mode. 32 bits per pixel. 8-bit R/G/B/X. X is ignored. Very common since the late 1990s.
M_TEXT: Alphanumeric text mode.
M_HERC_GFX: Hercules graphics mode.
M_HERC_TEXT: Hercules/MDA text mode.
M_CGA16: CGA graphics mode with composite video emulation.
M_TANDY2: Tandy/PCjr 2-color graphics mode, monochrome.
M_TANDY4: Tandy/PCjr 4-color graphics mode.
M_TANDY16: Tandy/PCjr 16-color graphics mode.
M_TANDY_TEXT: Tandy/PCjr text mode.
M_AMSTRAD: Amstrad-specific graphics mode.
M_PC98: Video mode used by NEC PC-98 emulation.
M_FM_TOWNS: Placeholder mode (stub) for future development.
M_PACKED4: SVGA packed 4bpp mode (not planar). Somewhat common in the mid 1990s on some SVGA chipsets, not seen since.
M_DCGA: Olivetti M24 DCGA
## VGA debug status
# Bottom of the screen: palette
RPAL shows the exact contents of the VGA hardware palette, as would be seen through I/O ports 3C7h-3C9h.