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The ATIC Interface Module

 

The Pin-Out to the Audio Tones and Interface Card (ATIC)

The following table summarises the edge-connector pin-out for the ATIC signals. It will be noted that the digital signals have been grouped in eights, for compatibilty with the typical Programmable Peripheral Interface IC that might occur in certain upgrades based on a microprocessor Single-Board System. In particular, the signals which change most frequently align with B0 or B7 so that, in the subsequent software manipulations, they may be shifted (left or right) into, or from the Carry for test or assertion. The parallel-track mother-board links together a pair of 32-way Eurocard (male-pin) connectors and passes the ATIC signals, pin for pin, to the Logic-8 card. Stops are only required on the tracks for pins 25-32, for the LED-display daughter-board, and pins 3-7, for the CAIRO-8 signals. (The CAIRO-8 Speaker or DIN pin-1 signal is unused in the Module, but passes from the Audio-8 plug to the DIN-8 socket, on its front panel.)

 

Pin Signal Reference PIO Sub-System Domain
1 GROUND Audio-8 Pin-4 / DIN Pin-2   mother-board Ground CAIRO-8
2 12V Audio-8 Pin-7 / DIN Pin-7   mother-board Power
3 Mic.-Hi Audio-8 Pin-6 / DIN Pin-3 (A7)  
4 Mic.-Lo Audio-8 Pin-5 / DIN Pin-5 (A6)  
5 PTT Audio-8 Pin-3 / DIN Pin-4 (A5) KEY [11] as metallic contact
6 Squelch Audio-8 Pin-8 / DIN Pin-8 (A4) buffered to be SQLCH [22]
7 AudioLine Audio-8 Pin-1 / DIN Pin-6 (A3) OPTO to mike [3,4]
8 Ground Guard (A2) (blank to avoid conflict with PIO interface signals)
9 Ground Guard (A1)
10 Ground Guard (A0)
11 KEY = PTT B7 Logic-8 : BCON + OPEN Digital Inputs
(TTL)
from Logic card
12 EAR Enable Audio Relay B6 *OPTO*, Logic-8 : OPEN
13 TL-M Tone Level-Medium B5 Tone OPTO- "R"
14 TL-L Tone Level-Low B4 Tone OPTO-"2R"
15 MUX-3 Tone Pitch (c) MSB B3 Logic-8 : PROM-Q3
16 MUX-2 Tone Pitch (b) B2 Logic-8 : PROM-Q2
17 MUX-1 Tone Pitch (a) LSB B1 Logic-8 : PROM-^Q2^
18 STROBE MUX Morse-Train/Pips B0 Logic-8 : PROM-Q1
19 Ground Guard (C0)    
20 TONBST = 1750Hz detected C1 567 PLL on Audio-Line Digital Outputs
(TTL)
to Logic card
21 VOX = user speech detected C2 556 Vox-gate on Audio-Line
22 SQLCH Rx-Squelch C3 buffered from [6]
23 CLOCK 20mS timebase C4 50Hz division of '8' MHz XTAL
24 PROBE Input (TTL active-low)   any "tell-tale" signal to Probe-LED [25]
25 Probe/LP Installers "wild-card" LED (C5) e.g. VOX Display LEDs
to LED-panel daughter-board
(on module case)

26 IT Internal Tones = MUX Strobe (C6) morse/pip(s) pulses
27 TA Through Audio = EAR (C7) Repeater is 'up' for active users
28 TX Key = PTT   Transmitter ON
29 TB Tone Burst = 1750 detect   user access
30 RX Squelch   carrier present
31 ON Display   current limited ground
32 5V daughter-board supply   switched to LED common rail

 

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G   B   3   Edge   Hill
- - .   - . . .   . . . - -   .   . . . .