ESDI terminator values

[Chuck Guzis]

ESDI used by CDC uses 150 ohms to +Vcc as termination on the control
cable.  Signal cables are radial, so they always have termination.

See:
http://bitsavers.org/pdf/cdc/discs/wren/77738212D_94166_Wren_III_ESDI_Product_Specification_Aug87.pdf
PDF Page 37

Also, generally, the CDC ESDI spec is here:

http://bitsavers.org/pdf/cdc/discs/wren/77738076D2_CDC_ESDI_Specification_Nov84.pdf

--Chuck




On 6/1/20 8:09 PM, Chris Zach via cctalk wrote:
> Working on restoring this 11/83, I would like to replace the Fujitsu
> 2284E drive with a slightly larger capacity CDC/Imprimis WREN VI
> 94246-383 ESDI. I think I have the jumper configurations, however the
> problem is the disk does not have a terminator pack.
> 
> Does anyone know what kind of resistor pack was used for the CDC drives?
> It's probably something very basic and easy to find at Digikey but what?
> 
> Thanks!
> Chris
> (working away here)