!pr0
!lm12
!rm75
Apple Chips........................................Bob and Bill

You may recall that when Bill reviewed Apple ][ Circuit Description last month, he bemoaned the lack of a "Cross Reference", by board location, of all the Apple's ICs.  Well Bob has worked out a couple of tables to fill that gap, and we'll be including those tables in future shipments of the book.

In the meantime, here's another sort of table, showing the locations and descriptions of all the chips in your Apple.  This one is organized by chip number.

           Board                Chip
Chip      Location(s)          Description
----      -----------          --------

555       A13 B3               Timer
558       H13                  3 Timers
741       K13                  Op Amp

2316B     A5  (Rev 7,RFI)      ROM (character generator)
2513      A5  (Rev 0,1)        ROM (character generator)
4116      C3-10 D3-10 E3-10    RAM
6502      H6-9                 Microprocessor
9316B     F3-11 (6 chips)      ROM (monitor and language)

74LS00    A2                   4 2-input NAND
74LS02    A12 A14 B13 B14      4 2-input NOR
74LS04    C11                  6 Inverters
74LS08    B11 H1               4 2-input AND
74LS11    B12                  3 3-input AND
74LS20    D2                   2 4-input NAND
74LS32    C14                  4 2-input OR
74LS51    C13                  AND3-NOR2, AND2-NOR2
74LS74    A11 B10 J13          2 Flip-Flops
74LS86    B2                   4 2-input XOR
74LS138   F12 F13 H2  H12      3-by-8 Decoder
74LS139   E2  F2               2 3-by-4 Decoders
74LS151   A9                   1-of-8 Selector
74LS153   C1  E11 E12 E13      2 1-of-4 selectors
74LS161   D11-14               Counter
74  166   A3                   8-bit Shift Register
74LS174   B5  B8               6 Flip-Flops
74LS175   B1                   4 Flip-Flops
74LS194   A10 B4  B9           4-bit Shift Register
74LS195   C2                   4-bit Shift Register
74LS251   H14                  1-of-8 Selector
74LS257   A8  B7  C12 J1       4 1-of-2 Selectors
74LS259   F14                  8-bit Addressable Latch
74LS283   E14                  4-bit Full Adder
74LS367   H3  H4  H5 (on some models)  6 Bus Drivers

8T97      H3  H4  H5 (on most models)  6 Bus Drivers
8T28      H10 H11    (on rev 0,1,7)    4 Bus Buffers
8304      H10        (on ref RFI)      8 Bus Buffers
