Sunday, August 9, 2020

Fixed my wrap plug so that it works properly with the 3174

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 IBM WIRING DIAGRAMS DISCUSS WRAP PLUG AS NOTES Each of the three cable types (EIA, X.21 and V.35) have their own wiring diagram in the main...

I am lucky with the cable I bought on eBay to connect my 3174

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 IBM COMMUNICATIONS CABLES The communications adapter connection on the rear of the IBM 3174 is a DB25 male connector, which can be used for...
Saturday, August 8, 2020

Looking into implementation of Binary Synchronous Communications link to the 3174

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CHARACTER SYNC AND MESSAGE BOUNDARIES IN BSC Most hobbyists are familiar with asynchronous serial communications which solve certain problem...
Friday, August 7, 2020

Working on the 3174 EIA wrap test plug until the diagnostic runs clean, controller tests out good

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 WIRING UP THE WRAP TEST PLUG I used the diagrams from the 3174 maintenance manual to build an EIA Wrap Test Plug. I had noted that the diag...
Thursday, August 6, 2020

Mystery of the IBM floppy drive cabling in the 3174 Controller

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DISK CONFIGURATION OPTIONS The model 51R controller that I own has four possible combinations of disk devices it supports. One 1.2MB floppy ...

Connectivity option being pursued between 3174 and PC running Hercules

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TYPICAL MAINFRAME CONNECTION TO THE 3174-51R The 51R is classed as a medium size remote controller for 317x and similar terminals. It is con...
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Tuesday, August 4, 2020

Flexible wrap-test connector platform for use with the IBM 3174 Communications Adapter

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THERE ARE A NUMBER OF WRAP TEST PLUGS AND SOME AMBIGUITY IN WIRING The Type 1 Communications Adapter that is built into my IBM 3174 controll...
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