DC instruction—Binary constant

The binary constant specifies the precise bit pattern assembled into storage. Each binary constant is assembled into the integral number of bytes (see 1 in Table 1) required to contain the bits specified, unless a bit-length modifier is specified.

The following example shows the coding used to designate a binary constant. BCON has a length attribute of 1.

BCON     DC              B'11011101'
BTRUNC   DC              BL1'100100011'
BPAD     DC              BL1'101'
BFOUR    DC              B'1111 0100 1111 0100'

BTRUNC assembles with the leftmost bit truncated, as follows:

00100011

BPAD assembles with five zeros as padding, as follows:

00000101

Table 1. Binary constants
Subfield	Value	Example	Result
1. Duplication factor	Allowed
2. Type	B
3. Type Extension	Not Allowed
4. Program type	Allowed
5. Modifiers Implicit length: (length modifier not present)	As needed	`B DC B'10101111' C DC B'101'`	`L'B = 1 1 L'C = 1 1`
Alignment:	Byte
Range for length:	1 to 256 (byte length) .1 to .2048 (bit length)
Range for scale:	Not allowed
Range for exponent:	Not allowed
6. Nominal value Represented by:	Binary digits (0 or 1)
Enclosed by:	Apostrophes
Exponent allowed:	No
Number of values per operand:	Multiple
Padding:	With zeros at left
Truncation of assembled value:	At left