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.

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