Description: Apple II Hardware: Errata in Apple II Reference Manual (2 of 2)
Header: Apple II Hardware: Errata in Apple II Reference Manual (2 of 2)

 Page 104
 The +12 and -5 volt levels are documented on page 92 as +11.8 and -5.2.  The
 levels will vary from Apple to Apple.

 Page 107
 Pin 19, SYNC, is connected only on Apples manufactured for sales overseas.

 Page 107
 Pin 21, RDY, is pulled high with a 1000 ohm resistor to +5 volts.

 Page 107
 Pin 22, DMA, is held high by a 1000 ohm resistor to +5 volts.  This signal
 will stop the 6502 clock.  It should not be held low for more than two clock
 cycles or the 6502 internal registers may be lost.

 Page 108
 Pin 28, INT IN, is the second item on the page and is mislabeled 26.

 Page 108
 Pin 32, INH, is pulled high by a 1000 ohm resistor.

 Page 108
 Pin 35, COLOR REF, is connected only on Apples manufactured for sales
 overseas.

 Page 119
 Figure 3 should be labeled:

        ROTATE ONE BIT RIGHT (MEMORY OR ACCUMULATOR) M or A.

 Page 120
 The Processor status word should be

    7                           0
  +---+---+---+---+---+---+---+---+
  | N | V |   | B | D | I | Z | C | PROCESSOR STATUS WORD, "P"
  +---+---+---+---+---+---+---+---+
            ^
            This bit is undefined.

 Page 121
 Note 1 should read "Bits 6 and 7 are transferred to the Status Register.  If
 the result of A AND M is zero, then Z=1; otherwise Z=0."

 Page 127-128
 The unimplemented opcodes are shown as NOPs, which is wrong. $EA is the only
 code defined as NOP.  The others should not be used as they perform undefined
 operations.

 Page 128
 Op-code $AD is a LDA, Absolute

 Page 137
 The addresses starting at line 100 should be:

        CLRAN0 EQU $C058
        SETAN0 EQU $C059
        CLRAN1 EQU $C05A
        SETAN1 EQU $C05B
        CLRAN2 EQU $C05C
        SETAN2 EQU $C05D
        CLRAN3 EQU $C05E
        SETAN3 EQU $C05F

 Page 143
 Starting at address $FA6F the comments should read:

        FA6F LDA CLRAN0 ;AN0 = TTL LO
        FA72 LDA CLRAN1 ;AN1 = TTL LO
        FA75 LDA SETAN2 ;AN2 = TTL HI
        FA78 LDA SETAN3 ;AN3 = TTL HI

 Page 165
 The comment after address $FCAC should read

        1.0204 USEC * (13+27/2*A+5/2*A*A)

 Pages 172-176
 These tables were cut up to fit the pages so they are no longer in numeric or
 alphabetic order.
 Apple Tech Notes


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