I have a considerable collection of ancient cables and adapters for that sort of thing around so I haven't shopped recently, but. The device you want is formally a 'Mini DIN8 to DB9 Serial Cable'. Macs of that era are not the only thing that used Mini DIN8 for serial, various aging Sun and SGI boxes, (modern) Gumstix embedded boards, and various industrial control systems use the same connector and (IIRC) pinout. Worst case, buy a cheap one (or raw connectors, or cheap cables with the appropriate connectors) and roll your own, they're standard and simple. I've been searching online, but yes, all the cables I can find are listed as PLC cables. Which as I mentioned, don't appear to be pin compatible with Apple but maybe I'm wrong. The SPARC systems I have use DB25 serial unfortunately.
I was hoping to not have to wire my own cables as I'd still need to buy the Mini-DIN connectors anyway. If someone has the right search keywords, that might help too, but I've looked on all the usual places. One on eBay looks right, but, it ships from Bulgaria.
I realized I read things in that weren't necessarily intended; When you say you're looking for a null serial cable, you mean one to use to speak RS232 (8/RXD+ tied to ground to put the Geoport into 232 mode, then pair swapped to be a null modem) with a device that has a DE9 connector (normal PC serial port), not to speak RS422 with another Mac or something? I looked around and things are even uglier than the last time this came up for me, I'd be seriously considering just hitting Amazon or an Electronics supplier (Newark has a Canada-specific site and their shipping is usually not too rapacious, quick glance comes up with and some Cat5 cable) for the connectors for a couple bucks, and (or a straight through and using a null modem adapter on the end to make the cables less confusing). I should really test my cables, I'm pretty sure I've used the same cable to talk to a Mac SE and an older Gumstix, and it appears that was a matter of luck that it happened to work for both.
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