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Going to try this:

Thanks for that, but they want $14 shipping, or about $40 total for that cable - that I may use this one time only. But I should be able to make any RS-232 COM cable I need now, with all of those adapters and ends I've bought, thinking my cable had all of the wires inside. The 8-wire cable...

This is exactly what the problem was, this is a 5-wire cable with 8-pin and DB9 connectors. Ordered an 8-wire cable this time, should be here tomorrow. https://www.amazon.com/gp/product/B0D415MLGV

That's a good idea, to check my current cabling with the working SE. Might as well do that, just to be certain the cables work, will do. I did recently complete the restoration of a C128/1571 drive over at lemon64; I got bit by the Commodore bug again when a generous and really cool older...

This is a good sub. https://www.mouser.com/ProductDetail/232-XK680MEFCSN35X40 Took that from the parts list maintained by JDW, it's always up to date: https://docs.google.com/spreadsheets/d/18X-EN67lQdZ2crCBAlkHrtqCCoJK6cLw_BkIYdlJvgs/edit?gid=0#gid=0

I do have that SE, it's like new, but don't have the straight 8-pin cable. But the cables I have should work, have the 8-pin to DB9 on the left, DB9 Null modem cable just in case the Rx Tx isn't crossed, and then this USB COM port, that was used in the past with Cisco RJ-45 COM ports. In the...

Got everything hooked up correctly, and still no Terminal access, got the CR+LF and Echo working properly, could see the commands given, but am not getting any response from the SE/30 board. This would mean the CPU, the Serial controller, or the Glue chip is not working correctly. Going to...

This particular cable said RS-232, but no mention of Null output. The adapter will be here tomorrow finally.

It took forever to get that din-8 to DB9 cable from ebay. When I connect it between a PC/USB COM port and the SE/30 serial port next to the audio output jack, I get no flashing cursor or keyboard input in Putty or TeraTerm, both set to 9600, 8, 2 stop bits, no parity, no flow control. Have a...

I've got to try to fix this stock board, if all else fails the Reloaded board is a great option. Gives me some hope this can be a useful tool. Thanks.

Nice work! What are you using on the DB9 end to talk to the SE/30 board with? Have you been able to retrieve any useful info from it?

You're welcome! And thanks to Adrian for putting the spreadsheet together. Found an 8-pin to DB9 that claims to be RS-232. Already have a USB to DB9/COM port that will connect to this. https://www.ebay.com/itm/184211248546 The cable was shipped this morning, should have it by this weekend.

Great to hear that cable works, I'll get the 8-pin DIN to DB9. Thanks! Here's the spreadsheet Adrian prepared with the commands for terminal access to the pre-ROM boot: https://docs.google.com/spreadsheets/d/1zsc7ET5fyiOYWj1_AzOgafbrCVFED-7jzLH6ruCiAVE/edit?gid=1499087781#gid=1499087781 He...

I have plenty of good DB9 capable PC's here. Just can't determine if that 8-pin Apple printer cable would line up with the correct DB9 output, or RS-232 COM port input. A null modem adapter might be necessary to cross the Tx and Rx between terminals, in order to get that to work.

I have a good SE instead of a IIci, would an SE and Zterm work, with the same cable you used?

Rather than try to visually inspect this board for broken traces, it's time for a diagnostics program. In this episode of Adrian's Digital Basement: he uses a modem cable (8-pin to 25-pin), converted with Laplink cables, to connect to a PC's DB9 port with Terra Term - in order to obtain error...

At least I didn't make it any worse. Need to check the Reset and Clock lines today. Is there a way to check the ROM without a spare or replacement?

Made it through the Data Pin Matrix, all pins and continuity check out. Need to put this back together, and start looking for reset and clock signals. Do have an ATX extension cable. https://www.amazon.com/dp/B07L88HJ9X

The Pin Matrix Data chart insists pin N is the last pin of UK8, the CPU. The Pin Matrix chart lines up correctly if you ignore there are only (13) pins, and pretend the last one is N.

Has anyone here successfully completed the SE/30 Data Pin Matrix? I'm showing that the columns in the chart don't match the CPU Pin numbers, but everything else lines up. Example: I'm in CPU pin K13, but it tones at ROM Pin 16, at D8, Pin 10 at S1A and S3A, and Pin 1 of the FPU. The colors...