Description: Apple II Hardware: Errata in Apple II Reference Manual (1 of 2)
Header: Apple II Hardware: Errata in Apple II Reference Manual (1 of 2)

 Page 4
 Because of continuing cost reductions on 16K RAMs, current revisions of the
 Apple II accept only 16K RAMs.

 Page 7
 Table 2, the backspace key are reversed.

        ->  $95  $95  $95  $95
        <-  $88  $88  $88  $88

 Page 9
 2nd Paragraph, the pins carrying the video signals are referred to as being
 on the left side of the board.  They are on the RIGHT.

 Page 10
 The photograph refers to a Revision 6 Apple.  Revision 7 and later Apples
 will look slightly different.

 Page 10
 The Eurapple modification is not complete and we do not support or recommend
 modification of Apples for European television signals.

 Page 11
 The photograph refers to a Revision 6 Apple.  Revision 7 and later Apples
 will look slightly different.

 Page 23
 The photograph refers to a Revision 6 Apple.  Revision 7 and later Apples
 will look slightly different.

 Page 25
 First paragraph, line 4; The address is actually $C040 instead
 of $C04F.

 Page 31
 Paragraph 3, line 3, "the leftmost column" should read "the rightmost
 column"

 Page  31
 Table 11 should read:

        LEFT EDGE     32 $20   0/ 0/39   $0/$ 0/$27
        WIDTH         33 $21   0/39/39   $0/$27/$27
        TOP EDGE      34 $22   0/ 0/23   $0/$ 0/$17
        BOTTOM EDGE   35 $23   0/24/24   $0/$18/$18

 Page 35
 ESC E "When COUT detects this" should read "When RDKEY detects this"

 Page 36
 The Autostart ROM initializes the annunciators 0 and 1 to OFF and annunciators
 2 and 3 to ON.

 Page 37
 Paragraph 5 refers to to using call -1169 to set $3F4 to XOR of $3F3 in
 autostart reset vector.  This may garbage the diskette in drive 1 if used on a
 non-autostart system.


 -) and the forward copy key (-
 Page 47
 The line of monitor command just under the first paragraph should read

        *0:FF FF AD 30 C0 88 D0 04 C6 01 F0 08
        *:CA D0 F6 A6 00 4C 02 00 60

 Page 70
 Paragraph 2, the page 3 memory usage chart is actually on page 65 of the
 manual instead of page 62.

 Page 70
 RAM Configuration Blocks are not included on Revision 7 and later Apple
 boards.

 Page 74
 The Zero Page memory maps are incomplete.  Applesoft also uses $D6 and
 Applesoft HIGH-RES uses $19 to $1D.

 Page  79  Table 22
 The line for $C060 should be

               $0   $1   $2   $3   $4   $5   $6   $7
        $C060  cin  pb0  pb1  pb2  gc0  gc1  gc2  gc3

 Page 81
 Paragraph 3 recommends IOSAVE and IORESTORE.  These routines must be used with
 caution because if any other routine in the system uses them, they will
 overwrite your information.  The 6502 stack is a better place to save the
 registers.

 Page 84
 Expansion ROM, paragraph 3, This flip-flop should be turned on by the I/O
 SELECT signal, not the DEV SEL signal.

 Page 89
 The photograph refers to a Revision 6 Apple.  Revision 7 and later Apples will
 look slightly different.

 Page 89
 The pointer to the USER 1 jumper is wrong.  See the photograph on page 99 for
 the correct location.

 Page 90 Paragraph 5
 RDY, RES, IRQ, NMI lines are held high by a 1000 ohm resistor, NOT 3300 ohm.

 Page 91
 Data from 6502 (read) and Data to 6502 (write) are reversed.
 They should be:

        Data from 6502 (write)
        Data to 6502 (read)

 Page 96
 Paragraph 4, line 5, the 74LS283 is at location E14.

 Page 100
 The Apple's new built-in keyboard is built around a AY-5-3600 keyboard
 encoder.  The inputs to this ROM,  pins 17 through 26 and 36 through 40, are
 connected to the matrix of keyswitches on the keyboard.  The outputs of this
 ROM are buffered by a 74LS04 and are connected to the Apple keyboard
 connector.

 The keyboard decoder rapidly scans through the array of keys on the keyboard,
 looking for one that has been pressed.  This scanning action is controlled by
 the free running oscillator made up of three sections of a 74LS00 at location
 B3 on the separate encoder board.  The speed of this oscillation is controlled
 by C7, R7 and R8 on the encoder board.
 Apple Tech Notes


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