Struct SkmBitSelector 

pub struct SkmBitSelector {
    pub quarter: Quarter,
    pub bitpos: SkmBitPos,
}

SkmBitSelector is primarily for use with the SKM instruction which can access bits 1-9 of quarters, plus the meta and parity bits (of the full word). Hence the wider range. See the index_address_to_bit_selection function.

Fields

quarter: Quarter

bitpos: SkmBitPos

Implementations

impl SkmBitSelector

pub fn to_value_bit(self) -> Option<BitSelector>

Trait Implementations

impl Clone for SkmBitSelector

fn clone(&self) -> SkmBitSelector

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SkmBitSelector

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

Formats the value using the given formatter.

impl Display for SkmBitSelector

Render the bit selector in the form q.b. Unfortunately the TX2 documentation is inconsistent in how the bit number is formatted. Page 3-34 of the User Handbook clearly says “Bit Numbers are interpreted as Decimal”.

However, section 5-5.2 of the Users Handbook provides a listing of the standard reader leader. The instruction at location 17 is shown as

INSTRUCTION              NUMERICAL FORM (OCTAL)
²MKZ₄.₁₂ 400011          |021712 400011|

Section 5-5.2 of the Users Handbook also shows an instruction in Plugboard A at address 0377775:

INSTRUCTION              NUMERICAL FORM (OCTAL)
³⁰SKN₄.₁₂ 377744         |301712 377744|

In both our examples above, quarter 3 has the value 0712 octal. This encodes the value generated by the 4.12 bit selector (as well as the bottom 3 bits of the opcode).

SKN is shorthand for ³⁰SKM and MKZ is shorthand for ²SKM. The opcode for SKM is 017. In the TX-2’s instruction word, the index bits are used to store the bit selector for the SKN instruction. In the TX-2’s convention these are bits 3.1 to 3.6 inclusive. That is, bits 19 through 24 (counting from 0 as the least significant):

Q3 Bit	Interpretation	Octal	Meaning
3.1 to 3.4	Bit number	012	10 decimal, the metabit
3.5 to 3.6	Quarter number	000	Q4
3.7 to 3.9	Low bits of opcode	007	Part of 017, for SKM

However, for the moment we will adopt the decimal convention since it is in wider use in the documentation.

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

Formats the value using the given formatter.

impl Hash for SkmBitSelector

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for SkmBitSelector

fn cmp(&self, other: &SkmBitSelector) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for SkmBitSelector

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for SkmBitSelector

fn partial_cmp(&self, other: &SkmBitSelector) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for SkmBitSelector

impl Eq for SkmBitSelector

impl StructuralPartialEq for SkmBitSelector