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Conversion Instructions Section 3-11
256-to-8 bit Conversion
When the fourth (leftmost) digit of C is 1, DMPX(077) finds the locations of the
leftmost (highest bit address) or rightmost (lowest bit address) ON bits in one
or two 16-word ranges of source words. The locations of these bits are written
to R beginning with the specified byte. (Set the third digit of C to 0 to find the
leftmost ON bits or 1 to find the rightmost ON bits.)
When two bytes are being converted, DMPX(077) will write the values to the
bytes in R from right to left and will wrap around to the rightmost byte if the
leftmost byte (byte 1) has been specified as the starting byte.
C: #0032
C: #0011 C: #0030 C: #0013
R
R
R
R
Digit 1Digit 3
Digit 1Digit 3
Digit 1Digit 3
Digit 1Digit 3
Digit 2 Digit 0
Digit 2 Digit 0
Digit 2 Digit 0
Digit 2 Digit 0
R
C
Leftmost
bit
Rightmost
bit
=0 (Convert one 16-word range.)
Finds leftmost bit
(Highest bit address)
256-to-8 bit decoding
(The location of the leftmost bit in the
16-word range (m) is written to R.)
n=1 (Start with byte 1.)
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