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Jonathan Campbell 2025-03-31 03:01:30 -07:00
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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. 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 ## VGA debug status
# Bottom of the screen: palette # 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. RPAL shows the exact contents of the VGA hardware palette, as would be seen through I/O ports 3C7h-3C9h.