D-shell sizes [was Re: Slightly rare Mac 512k with D(?)-25 connector]

r.stricklin bear at typewritten.org
Wed Sep 5 20:28:29 CDT 2007

On Sep 5, 2007, at 9:40 AM, Chuck Guzis wrote:

> 37-pin External floppy drive connectors on PC and PS/2.  Some SCSI
> cards (e.g. the Iomega Bernoulli PC version) also used them.  There's
> also a 68-pin 3-row "high-density" version used on Overland and Chi
> Pertec 9-track adapters.

Nit, it has 62 pins. It's a DC62.

> There's also a "thicker" 50-pin 3-row (not HD) connector used for  
> the external connector for some PC-based QIC-02 and QIC-36  
> controllers (Wangtek, I think).

That's the D-size. The DD50. There are also DD78 and DD100 connectors.

> There were also non-standard sizes, such as the 19-pin D connector
> used for Atari ST ACSI connections.

I've heard them described as DF19 (NeXT monitor, Macintosh floppy)  
and DG23 (Amiga floppy, Amiga RGB), though this is not part of the  

Jules mentioned alternate pin designations too. Besides the "W" for  
coaxial "pins", there are also "high current" pins, physically the  
same size as the coaxial ones but with a single conductor, and  
perhaps others besides.

Gee, look what I found.



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