Textbook Errors

• page 97, table
  The 8th row in the first column (Bit Pattern) should be 0000 0111, not 0000 0000.
  The 16th row in the first column (Bit Pattern) should be 0000 1111, not 0001 1111.
• page 116
  The sentence with bit ranges should be
  . . .character might be stored using bits 0-7,8-15, 16-23, and 24-31.
  not
  ". . .character might be stored using bits 0-8,9-15, 16-23, and 24-31."
• page 117
  The code fragment just before the start of section 5.2 should be

  
  not  mask, mask1           # Create inverse mask
  and  cell, mask, cell      # Clear 'C'
  or   cell, cell, little_c  # Merge little_c into cell
  
  

• page 122
  The subscripts for x and y in the last equation on the page are all written as 1s (ones). The subscripts for the first x and y to the right of the equal sign ('=') should be 0s (zeros).
• page 132
  The code in figure 5.8 for multiplication of two's complement integers only works for positive values of X (the multiplier).
• pages 142-143
  The equations given at the bottom of page 142 and top of page 143 contain errors in a superscript (exponent). The equation at the bottom of page 142 should read
  = 0001 0000 0000 0000 0000 0000 (base 2) = 2 ** 20
  At the top of page 143, the rightmost part of the equation should be
  1 + (2**20)/(2**23)
• page 144
  The first sentence on the page should read
  Here is the addition of 255.0625 to 134.0625:
  not
  "Here is the addition of 255.0625 to 2.25:" The instruction
• page 146
  The sentence
  "The value 135.861 in FPS format is"
  appears twice on the page. The second one is incorrect. It should be
  "The value -135.861 in FPS format is"
• page 160
  The sentence in the middle of the page should read
  Once underflow occurs, any number of multiplications will still produce the result of zero.
  not
  "Once overflow occurs, any number of multiplications will still produce the result of zero."
• page 173
  The instruction in the middle of the page

  
       add   i, 5
  
  

  should be

  
       add   i, i, 5
  
  

• pages 179 and 181
  There is a typo in the code fragment. The move instruction should be

  
       move  M[address], 0        # clear element
  
  

  not

  
       move  m[address], 0        # clear element
  
  

• page 187, figure 7.9
  There are 3 typos in the code fragment.
• page 210
  The addressing mode labeled Indirect should be labeled Register Indirect.
• page 219
  The paragraph at the top of the page is wrong. In SAL, the instruction is called cvt. In MAL, the equivalents are cvt.s.w and cvt.w.s.
• page 231, figure 9.3
  The add instruction at label if should be

  
       add  $20, $19, -1
  
  

  not

  
       add  $19, $20, -1
  
  

• page 264, figure 10.1
  The figure has an error in the hexadecimal address. The address that reads 0x7fft f000 should be 0x7fff f000.
• page 271, figure 10.2
  The addi instruction at label end should be

  
       addi  $2, $0, 10
  
  

  not

  
       addi  $8, $0, 10
  
  

  This error is propagated (incorrectly) in figures 10.3 and 10.5.
• page 316, figure 12.2
  Bit 3 of the Status register is called KUp, not PUp.
• page 390, MAL table
  The second operand of the move instruction should read S1, not S2. The source of a move cannot be an immediate. If you want to move an immediate, use the li instruction.

Appendix B -- MAL

• The ror (rotate right) and rol (rotate left) instructions should appear in the table. The operands are the same as the shift instructions.
• Unsigned arithmetic instructions addu and subu instructions should appear in the table.