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apple2_thunderclock
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Apple 2 Hardware Disassembly Project - Peripheral: ThunderClock Plus

== Parts List ==

  • 1x 1990C
  • 1x 2708 (EPROM)
  • 1x 74LS08 (Hitachi 0D4 8 / HD74LS08P)
  • 1x 74LS27 (Hitachi 0F44 / HD74LS27P)
  • 1x 74LS74 (Hitachi 0E3 T / HD74LS74AP)
  • 1x 74LS109 (Hitachi OF2 4 / HD74LS109AP)
  • 1x 74LS126 (Hitachi 0J3 4 / HD74LS126AP)
  • 1x 74LS132 (Motorola SN74LS132N / I8015)
  • 1x 74LS174 (Hitachi 0D4 T / HD74LS174P)
  • 1x CD4050 (Motorola MC14050B / CP QQ8014)
  • B1 HOLDER BATTERY 1CELL N ALUMINUM DigiKey: 36-154-ND
  • B2 HOLDER BATTERY 1CELL N ALUMINUM DigiKey: 36-154-ND
  • C1 104Z (East)
  • C2 104Z (East)
  • C3 104Z (North)
  • C4 104Z (North)
  • C5 104Z (East)
  • C6 104Z (North)
  • C7 NPO 20J
  • C8 variable
  • CX ???
  • D1 ??? M5?2? (Diode)
  • D2 ??? N40-0 (Diode)
  • R 1 Brown- Black- Orange Gold = 10 * 1K Ohm +/- 5%
  • R 2 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
  • R 3 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
  • R 4 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
  • R 5 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
  • R 6 Orange Orange Red--- Gold = 33*100 Ohm +/- 5%
  • R 7 Brown- Black- Orange Gold = 10 * 1K Ohm +/- 5%
  • R 8 Yellow Violet Orange Gold = 47 * 1K Ohm +/- 5%
  • R 9 Orange Orange Red--- Gold = 33*100 Ohm +/- 5%
  • R10 Blue-- Orange Black Gold = 63 * 1 Ohm +/- 5%
  • R11 Brown- Black- Orange Gold = 10 * 1K Ohm +/- 5%
  • R12 Brown- Black- Green- Gold = 10*100K Ohm +/- 5%
  • R13 Brown- Black- Green- Gold = 10*100K Ohm +/- 5%
  • SW1 DIP SWITCH
  • SW2 -- not installed --
  • Q1 2N3904
  • Q2 2N3904 ???
  • Q3 2N3904
  • Q4 2N3904 ???
  • Y1 ???
Color Digit Multiplier
Black 0 1 Ohm
Brown 1 10 Ohm
Red 2 100 Ohm
Orange 3 1K Ohm
Yellow 4 10K Ohm
Green 5 100K Ohm
Blue 6 1M Ohm
Violet 7 10M Ohm
Grey 8
White 9
Gold - x 0.1
Silver - x 0.01

== Layout ===

  • Component Side:
 _______________________________________________________________________________
|                B2      B1      C8    SW1           ThunderClock Plus          |
|R12 R13 Q4                     Y1 C7                              C4       Q1  |
|                             D2     1990C  CD4050  74LS174  74LS08   74LS132   | A
|        Q3                 Q2                    R3       R2                R1 |
|                                    R4                                         |
|        R11                  R7     R5                                   Sw2   |
|                                                                               |
|            D1   74LS74  74LS109  74LS126                   2708  C3  74LS27   | B
|        R10    R9      R8       R6                                C2           |
|                                       C6         C5          C1            CX |
 ___________________________________________________                         ___|
                                                    |_|_|_|_|_|_|_|_|_|_|_|_|
                                                     1                    25

== Schematic ==

  • TODO

== Questions ==

  • What is Y1 ?
  • What is CX ?
  • What is D1 ?
  • What is D2 ?