Good grief the pin numbers for the DE9F are wrong on that drawing too. I can't make sense of that drawing at all, and so I'm ignoring it.
I'm going to go by the actual user manual. That too has one slight confusion but not really. At first glance it looks like it's saying there is a 9pin male connector on the z88, but it's really saying to use a 9pin male connector to make a cable. https://archive.org/details/aa153-Z88_User_Guide/page/n235/mode/2up It's neat that they included an explicit provision for powering rs-232 to cmos level shifters (max232, max3232). This also shows a female connector on the z88, so between the pics and the manual, I'm going ahead assuming it's a female connector on the Z88. https://oldcrap.org/2019/10/28/cambridge-z88/ I've updated the wiki and github project to include Z88 versions of the schematic, PCB, and BOM. http://tandy.wiki/TPDD#Cable Untested of course. I don't have a Z88 and only just updated the drawings now. But it's all tested with Model 100 and other "Model T"s, so as long as the original Z88 manual isn't lying, then it's good to go. For future reference, note that pin numbers for both male and female plugs are the same, in the sense that, pin#1 of a male plug plugs in to pin#1 of a female plug. That means that, regardless if you're looking at the front on the connector where the pins are, or the back where the solder legs are, and regardless if you are talking about the port on a device or the end of a cable that plugs into that device, pin#1 always means the same pin#1. IE, pin#1 on the device does not connect to say pin#6 on the cable. It connects to pin#1 on the cable. So, the way to avoid getting confused is, always use the correct pin numbers according to standards, and expect everyone else (official) to have done so also, and then, you don't care if you're dealing with a male or female plug, you just know that you need for example, the ground goes on pin #7. Then, on the connector itself, the pins are individually numbered explicitly so you don't have to guess which one is pin#7. You can also always google up references for standard connectors themselves, regardless what kind of device is using the connector or what kind of signals are on it. The same goes for the rectangular pin headers and IDC connectors. There is a specific location for pin#1, and a specific numbering pattern to proceed from pin#1. They aren't individually labeled on IDC connectors, or labelled at all on plain pin headers, but either the connector or the pcb silkscreen will always indicate where pin#1 is, and you follow the standard to number the rest. The TPDD drive adheres to the standard for the 2x4 pin header on the back. So, the z88 manual lists signals and pin numbers for the de9 plug on it's end, and the tpdd manual lists pin numbers and signals for the 2x4 pin header on it's end, and it's possible to derive a correct cabling between the two without having to guess about anything like what the author means by "front", and without the confusion introduced by things like that drawing which uses pin numbers, but all incorrect pin numbers. -- bkw
