A3 Z Counter

End is Labeled:

A-3          Z    COUNTER                            100-101112
N              L               J                                                   B  A
G              R              R                                                   T  T
r                e               e                                                    P  P
n               d               d

ICD-GPS-200

The Z count consists of a 29 bit binary number composed of two parts: This board should have a counter of at least 29 bits length and the logic to cause rollover of both parts at the correct counts.   Z count is displayed on the front panel as a 7 character octal number therefore there will be a number of wires going from this module to the front panel.


A3 PCB
 
 
Elec  cap Elec cap balnk Elec cap
header   -rr----- F  74LS32PC blank blank
TI SN74LS123N SN74LS169N TI SN74LS37N M SN74LS169N
Beckman  899-1-R1k M SN74LS169N TI SN74LS169N M SN74LS169N
TI SN74LS00N AM35LS194APC M SN74LS169N AM25LS194APC
F 74LS08PC M SN74LS169N AM25LS194APC F 9LS/74LS133
DM74LS74N M SN74LS169N M SN74LS169N AM25LS08PC
M SN74LS169N AM25LS194APC M SN74LS169N F 74S32 PC
M SN74LS169N F 74LS08PC AM25LS194APC AM25LS08PC

The wire wrap PC board is marked:  STI 021-100533  REV A