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apple2e: fix FLASH timing #14554

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Merged
merged 1 commit into from
Nov 22, 2025
+10 −1
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apple2e: fix FLASH timing #14554

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11 changes: 10 additions & 1 deletion src/mame/apple/apple2video.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -955,7 +955,16 @@ uint32_t a2_video_device::screen_update(screen_device &screen, bitmap_ind16 &bit
}

// always update the flash timer here so it's smooth regardless of mode switches
m_flash = ((machine().time() * 4).seconds() & 1) ? true : false;
if (Model == model::IIE || Model == model::IIGS)
{
// video scanner overflow flash timer every 16 frames, ~1.87 Hz (NTSC)
m_flash = screen.frame_number() & 0x10;
}
else
{
// approximate 555 flash timer, ~2 Hz cycle
m_flash = (machine().time() * 4).seconds() & 1;
}

int text_start_row = 0;

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