Struct BusTiming

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pub struct BusTiming {
    pub mem8_ns: f64,
    pub mem16_ns: f64,
    pub mem32_ns: f64,
    pub io_ns: f64,
}

Expand description

How long the CPU waits for the video card on each access, in nanoseconds.

Video memory on the ISA bus was slow, and how slow decided whether a full-screen copy fit into the vertical blank or tore. Every Dos::poke / Dos::outb advances the clock by these amounts.

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§mem8_ns: f64

One 8-bit video memory access.

§mem16_ns: f64

One 16-bit access (two 8-bit cycles on an 8-bit bus).

§mem32_ns: f64

One 32-bit access.

§io_ns: f64

One I/O port access.

Implementations§

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impl BusTiming

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pub const INSTANT: Self

Free: video memory as fast as system RAM. Tearing then only comes from when you draw. Port accesses still cost a little (MIN_IO_NS), so status polling loops terminate.

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pub const ISA8: Self

An 8-bit card in a 4.77 MHz PC/XT (CGA, Hercules, early EGA): about 1 MB/s.

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pub const ISA16: Self

A 16-bit ISA VGA in a 286/386: 2-4 MB/s, a full mode 13h frame takes longer than the vertical blank.

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pub const VLB: Self

A VESA Local Bus card in a 486: ~30 MB/s.

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pub const PCI: Self

A PCI card in a Pentium: ~60 MB/s.

Trait Implementations§

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impl Clone for BusTiming

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fn clone(&self) -> Self

Returns a duplicate of the value. Read more

1.0.0 (const: unstable) · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Copy for BusTiming

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impl Debug for BusTiming

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl PartialEq for BusTiming

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fn eq(&self, other: &Self) -> bool

Equality operator ==. Read more

1.0.0 (const: unstable) · Source§

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=. Read more

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impl StructuralPartialEq for BusTiming

Auto Trait Implementations§

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impl UnwindSafe for BusTiming

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more

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where T: ?Sized,

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where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)

Performs copy-assignment from self to dest. Read more

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Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s.

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Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.

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impl<T> Downcast<T> for T

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fn downcast(&self) -> &T

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Calls U::from(self).

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where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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