On Jul 23, 2009, at 12:29 AM, Sterling wrote:
> Why does apple do this? > They needed a 19-pin connector in the D-Sub format for their external floppy drives. 15 wouldn't do it as 19 or 20 pins was required, and a 25 pin connector would not fit on the mobo. As all D-Subs have an odd number of contacts, a DB-19 was the obvious answer, as a DB-21 would be the next possibility. The actual floppy header is 20 pins, not 19, but one of those 20 is a dummy. Well, two are dummies, on the Super Drive models. > Digikey and several other regular parts stores don't seem to carry a > DB-19 part. > It's not a standard offering in anyone's catalog. It was a "special", available directly from the manufacturer, only. > I want to make an Apple Disk cable, but cannot find the part anywhere. > You cannot find it for the reasons already mentioned. > I need the female version in particular. > The female was originally made only on a PCB-mounted type, for soldering to the mobo, but there were a few which were "wire mounted" which became available at surplus about 15 years ago. These were made by AMP Inc, and used standard AMP crimped and inserted pins. None, to my knowledge, were made with "solder tails", for soldering. I used one of these to extend the mobo's floppy connector on one of my Beige G3 Mini-Towers to the back panel, when I removed the internal floppy and replaced it with a 3.5" hard drive. About 1997, so about twelve years ago. This cable was a 20 conductor ribbon with a 20 pin female connector on the mobo end and the 19-pin D-Sub on the other end. Worked great, and allowed the use of the Super Drive which I originally bought with my SE/30 as an "external" floppy on my Beige G3 Mini-Tower. > Maybe there are cables I can buy that already have the female Db-19 on > them? No, the cables with integral molded DB-19s all had male connectors, not female connectors. There may still be a few female DB-19s in inventories in Silicon Valley surplus houses. Your best bet would be HSC, in Santa Clara. Ask for an AMP-type DB-19F which is a shell, only, and uses AMP Inc inserted pins. An issue is no one made shells for DB-19s as all were either soldered to the mobo, or had an integral molded shell. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
