IBM 5251 terminal USB conversion (but not what you think)

listofoptions

02 Oct 2020, 02:13

thats cool, ive found some; let me know if these work, im planning on spinning up my own to do some data-sniffing around a system 32/34/36/38 i have occasional access to.
here are my notes for the 5250 anyway:

connector for panel mount connector Amphenol 082-5590-RFX
cable ends use Amphenol 082-5589-RFX
use Belden 9207 or equivalent

the cable ends and connectors should be 50-ohm (93ohm are hens teeth) and the cable is 100ohm (also a hens tooth, but Ive seen 100, 107, 93, 78, etc.. for twin-ax characteristic impedance ratings, so YMMV apparently)

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inmbolmie

02 Oct 2020, 08:24

listofoptions wrote:
02 Oct 2020, 02:13
thats cool, ive found some; let me know if these work, im planning on spinning up my own to do some data-sniffing around a system 32/34/36/38 i have occasional access to.
here are my notes for the 5250 anyway:

connector for panel mount connector Amphenol 082-5590-RFX
cable ends use Amphenol 082-5589-RFX
use Belden 9207 or equivalent

the cable ends and connectors should be 50-ohm (93ohm are hens teeth) and the cable is 100ohm (also a hens tooth, but Ive seen 100, 107, 93, 78, etc.. for twin-ax characteristic impedance ratings, so YMMV apparently)

Connectors look fine. Cable in theory is 110Ω but yes, for short cables it shoudn't be that important. For some time was operating with a random twisted pair cable and terminators on a prototype board and worked just the same. Obviously if you run long cables with multiple stuff connected that becomes important.

monty11ez

12 Dec 2020, 04:44

This is so amazing. I was just looking for a nice terminal project for my computer and came across some IBM terminals that looked really nice, but I didn't know how to connect them to a modern computer. Fortunately Google brought me here, so it looks like I might have a new project on my hands.

Pingmeide

05 Jan 2021, 20:27

Hi, I just want to report that the 5250 adapter I got from Inmbolmie in July still works very well. The IBM 3477 Terminal I obtained works fine with the box and I use the terminal frequently - the picture quality is far more friendly (crisp) for the eyes than the normal computer screen.(In my opinion) Back in mid-2020 inmbolmie was very helpful in creating a "mapping" table for the German keyboard-layout and the money I spent was a good investment - thanks again !

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