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voodoo: Restore some cycle stealing on vretrace to allow sfrush to boot.

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This commit is contained in:
Aaron Giles 2021-07-09 15:07:39 -07:00
parent 1c00213b65
commit f0106d986a
1 changed files with 3 additions and 0 deletions
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src/devices/video/voodoo.cpp
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@ -2034,6 +2034,9 @@ u32 voodoo_1_device::reg_fbiinit2_r(u32 chipmask, u32 regnum)
u32 voodoo_1_device::reg_vretrace_r(u32 chipmask, u32 regnum)
{
// sfrush needs this to be at least 1 extra cycle slower or else it won't boot
m_cpu->eat_cycles(1);
// return 0 if vblank is active
return m_vblank ? 0 : screen().vpos();
}