Charlieman, if his is like mine, it's HDI-30 on one end and DB-25 on the other. That's it – designed for converting the funky PB-SCSI port to a standard Apple port. I also have the one you are thinking of which uses an HDI-30 (on both ends) cable and has two DB-25 ports (which is also bus-powered), with which I have successfully used as a coupler for two DB-25 SCSI connectors without the HDI-30 port.
I have never seen a female HDI-30 to DB-25 connector and believe me I've looked ever since I had my first Duo. The only way to get one is off another PowerBook, or a device designed to use the PowerBook cables as a converter, with the custom HDI-30 male-to-male cable for use with a PowerBook.
LCGuy, this is not exactly the right thread, but in a nutshell, I needed to test whether the flyback transformer of an old Mac bought off eBay, or the CRT was dead. So I used the flyback transformer from a good Mac to drive the other Mac's CRT. This demonstrated that not only was the CRT good, but the rest of the video circuitry was good as well. So, the painstaking removal and replacement of the flyback transformer was not performed in vain! Both Macs were powered up and neither appeared to suffer any ill effects.
I have never seen a female HDI-30 to DB-25 connector and believe me I've looked ever since I had my first Duo. The only way to get one is off another PowerBook, or a device designed to use the PowerBook cables as a converter, with the custom HDI-30 male-to-male cable for use with a PowerBook.
LCGuy, this is not exactly the right thread, but in a nutshell, I needed to test whether the flyback transformer of an old Mac bought off eBay, or the CRT was dead. So I used the flyback transformer from a good Mac to drive the other Mac's CRT. This demonstrated that not only was the CRT good, but the rest of the video circuitry was good as well. So, the painstaking removal and replacement of the flyback transformer was not performed in vain! Both Macs were powered up and neither appeared to suffer any ill effects.