patscc
Veteran Member
You're absolutely right. I meant 26, not 16. Which is kinda embarrassing seeing as how I posted the link with the Z80 pinout in the first place. Oh, well, been tired.
patscc
patscc
Does your Fluke have a frequency counter ? What model is it ?
patscc
The terminology's a little confusing here; when you say 'monitor' in this context do you mean the terminal?I don't have any specific reason to suspect the monitor, except a lack of activity on the LED serial tester; they do a bit of a show when I turn the monitor on but that's about it, other than the faint flicker of key presses. When I had local echo on, it would require the computer to be on to give me line feeds. If 'puter was turned on later, then previous keystrokes all appeared at once.
Or pick up a used scope somewhere. Is there anyone you can borrow a scope from ?
patscc
No, but I didn't see any mention of it, so I thought I'd better ask. The +-16v and +8v are all present at the Teletek, correct ?
patscc
First thing in the morning.A few more questions. On the file FDC-1C007.jpg, there's a bunch of voltages penciled in on the serial ports. Can you measure those ?
No, it came on the brown truck, I was elated to find it had echo once I was brought up to speed on the pin numbering.Also, have you had the terminal successfully hooked up to anything else before, recently ?
Yes, I still use a Compaq with D-9, I need it for programming many remotes with IR codes and macros.Do you have a PC, or something else with a serial port, either 9 or 25 pin?
Can't hurt, but if the terminal echoes when 2 & 3 are jumpered and stops when the jumper's removed I think we can assume that it's working. I'd still like to see it echoing through the 1488 & 1489 though, to confirm that they're OK and the cable's wired correctly.Well, here's a thought. We can try to get the terminal talking to the Compaq to see if the terminal works, or try to get the board to talk to the Compaq.
patscc
Can't hurt, but if the terminal echoes when 2 & 3 are jumpered and stops when the jumper's removed I think we can assume that it's working. I'd still like to see it echoing through the 1488 & 1489 though, to confirm that they're OK and the cable's wired correctly.
And also whether the CPU's address lines are toggling, i.e. whether the voltages change when it's held in reset state vs. running.