Kabuto n.d.

Cite as: Kabuto n.d.
Original: https://plutiedev.com/mirror/kabuto-hardware-notes
sha256: 977ddfe554b97aeb30be4e51525bee5313683ace93abe59cb0b97facbc0d67a7
Archived: https://web.archive.org/web/20261005184056/https://plutiedev.com/mirror/kabuto-hardware-notes
Accessed: 2026-10-27
Licence: none stated on the page
Credit: Kabuto of TiTAN, written during the development of the demo Overdrive 2 (version 1.5); mirrored on Plutiedev from Kabuto's published Google document.
Notes: Hardware findings from Kabuto's own tests on Mega Drive consoles. Used for the VDP's line length in master clocks and its lines per NTSC frame.

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The NTSC Mega Drive/Genesis draws 59.9227 frames a second. Its VDP takes 3,420 master-clock ticks for each raster line, in both the H32 and the H40 mode, and an NTSC frame is normally 262 lines: 896,040 master clocks a frame. With MAME's NTSC master clock of 53.693175 MHz, that is exactly 3,579,545/59,736 frames a second (59.922743). MAME's driver sets its NTSC screen to the same rate, the master clock ÷ 10 ÷ 262 ÷ 342.	`Timing tricks with the H40 mode flagsTiming tricks with the H40 mode flagsPicture size`	Web