View Full Version : 5th pin in data cable...

September 19th, 2006, 06:13 AM
It's requied?
I need to cut that pin from controller.

I'am replacing MFM controller in computer.
As I don't have enough long cables to use 'em in XT I'll use IBM ones wich haven't hole there, where 5th pin goes.

September 19th, 2006, 06:29 AM
Search for the ST506 pinout on Google. The answer is readily available.

September 19th, 2006, 06:59 AM
Okay, I've got it.

But... reserved - it means, that's not used?
And, yes I looked into dictionary ;).

September 19th, 2006, 07:20 AM
Google doesn't always give definitive answers, but now your homework is done and we can discuss. ;-)

Many references list the odd pins as 'ground', and some as reserved. If it doesn't have a named signal going across it, it is fair game and you can remove the pin.

I would suggest modifying the cable, or getting a different cable instead. Cables are easier to replace than controllers.

September 19th, 2006, 07:45 AM
5th pin in my source is marked as reserved.
In another two controllers from Western Digital I don't have 8th pin, wich is marked as Ground.

As on Xebec controller there's no 5th pin, cable from Xt lacks hole for 5th pin...

Getting such long cables will be difficult, as getting any MFM cables is hard.
Maybe I could build one from FDD cable... ;)

September 19th, 2006, 09:08 AM
Personally I would bend the pin over, that way it can be bent back if you find out you need it ;)

September 19th, 2006, 09:14 AM
I've also used a hot paperclip to melt a hole in a connector without one.

September 19th, 2006, 03:53 PM
I've also used a hot paperclip to melt a hole in a connector without one.

I've had good results using a tip cleaner for a gas welder. It's basically a finger-drill with a selection of tiny drill bits. Should be available from your local welding supply house.


Terry Yager
September 19th, 2006, 04:44 PM
I got one of those little rotary-tool thinggys from Harbor Freight, for around $8.50. It's already paid for itself.