Teletype Model 42 ASR - 4220 AAB + 4250 AAA

IMG_2934.JPG (3686331 bytes) IMG_2933.JPG (3732755 bytes) IMG_2938.JPG (2448547 bytes) Model 4220 AAB Teleprinter
IMG_2943.JPG (541569 bytes)
IMG_2932.JPG (1464872 bytes) IMG_2915.JPG (2436567 bytes) IMG_2925.JPG (1391267 bytes) IMG_2914.jpg (84526 bytes)
Note "Transmit"-"Receive"-"Transmit Simulator" switch
IMG_2912.JPG (1526350 bytes)
IMG_2913.JPG (1677153 bytes) Switch and Indicator Lamp
IMG_2944.JPG (2151060 bytes)
IMG_2947.JPG (2602226 bytes)
External Cable w/ Molex Connector

Brown - Loop + ??
Black - Loop - ??
White - Chassis Ground

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IMG_2923.JPG (1066252 bytes) IMG_2924.JPG (965585 bytes) IMG_2927.JPG (1728368 bytes) IMG_2928.JPG (1668066 bytes)
Power Supply 430780
IMG_2929.JPG (3040909 bytes)
Send-Receive Loop ???
IMG_2931.JPG (1486528 bytes)
Ribbon Cartridge Replacement
IMG_2916.JPG (3096264 bytes)
Spare something taped inside
IMG_2930.JPG (1441021 bytes)

Controller Interface Board - 410382 Dual EIA plus Neutral

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IMG_2962.JPG (2350172 bytes) IMG_2963.JPG (2480697 bytes) IMG_2964.JPG (2484302 bytes) IMG_2965.JPG (59824 bytes)

Controller Board - 410231 5 Level SCCAT - what does this mean?    

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IMG_2970.JPG (1409428 bytes) IMG_2969.JPG (1617833 bytes) IMG_2968.JPG (1673504 bytes) IMG_2967.JPG (1727916 bytes)

Paper Tape Unit Details

IMG_2937.JPG (1189070 bytes) IMG_2935.JPG (1023237 bytes) Optical tape reader
IMG_2936.JPG (1147633 bytes)
Model 4250 AAA paper tape unit
IMG_2940.JPG (227441 bytes)
IMG_2941.JPG (928508 bytes) IMG_2942.JPG (3009083 bytes) Mike Hatch's paper tape unit showing the chad box in place
pt-mike-01.jpg (97258 bytes)
Mike's chad box, chad chute, and "wing cover" - I need these - Please send me email if you have a spare.

chadboxetc0168.jpg (1611950 bytes)


1987 Naval Sea Systems Command Safety Tag
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COMNAVSURFRESFORINST 3502.lA
31 OCT 1990

STS 101-0001 - COMMUNICATIONS REFRESHER TRAINING
Description:-  This course provides refresher training in various areas such
as Crypto Material System (CMS), ACP 126 and modified ACP
126 message formats, Task Group Orestes (TGO) circuits, and
shipboard simulator teleprinter (MOD 42) usage.

LESSON TOPIC TITLE
1.1 Communications Organizations
1.2 Introduction to Security
1.3 Accountability and Control of Classified Material
1.4 Accountability and Control of Communications Security Material System (CMS)
2.1 Outgoing Message Processing
2.2 Broadcast Circuit Operating Prodecures
2.3 Incoming Message Processing
2.4 Message Reproduction/Distribution (R/D) and Filing
2.5 Genadmin Message Text Format
3.1 Model 42 Teleprinter
3.2 Operating Signals (OPSIGS)
3.3 Basic Radioteletype Circuit Operating Procedures
3.4 Basic Radiotelephone (R/T) Circuit Operating Procedures
4.1 DD-173 OCR Message Format
4.2 ACP 126 Message Format
4.3 Modified ACP 126 Message Format
4.4 JANAP 128 Message Format