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Unable to get SIO card working
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Hello everyone, hope you're having a fine day!
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I just picked up this kit a few weeks ago and I haven't been able to get the SIO card working. The front panel and CPU card work fine together but if I have the SIO card installed nothing seems to work. I have tried it with and without the front panel card.
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When I plug the SIO card in the only thing that happens is the LEDs flash a few times then stay on or turn off. Nothing comes out over the terminal connection (assuming the setting are the same as the front panel settings, which work fine). As for troubleshooting, I have checked to make sure there is no solder bridges that are obvious, and I tried to reflow the joints to be sure I didn't mess any up. I reseated the socketed chips and made sure that there was continuity between the pins and the solder joints on the underside of the board. I did replace R6 in a really stupid way because I somehow missed that it was supposed to look like it did. I honestly don't know how I missed that considering all the times I read through trying to figure out where I went wrong. Hopefully I didn't screw it up worse with that.
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I've swapped the files on the SD card multiple times to make sure I didn't mess that up but I've had no luck with that.
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And at this point I have exhausted my ability to troubleshoot and I'm hoping someone here can give me a hand in getting this running. I'm sure its going to be something stupidly simple because I always miss the easy stuff.
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I have some closeups of my boards if anyone wants to see them to make sure its not a stupid mistake:?
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Thanks for any help you can give!
Morgan |
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Hi Morgan, Can you measure the current draw?? Should be about 200mA I think?? If it's too high, try removing the UART chip, it may be faulty? Try other chips, remove one at a time. If you are in Canada you are welcome to mail me the board if we get stuck.? Or even come visit me if you're near Toronto. Cheers, Josh
On Friday, September 18, 2020, 06:59:04 a.m. EDT, mhtbx118@... <mhtbx118@...> wrote:
Hello everyone, hope you're having a fine day!
?
I just picked up this kit a few weeks ago and I haven't been able to get the SIO card working. The front panel and CPU card work fine together but if I have the SIO card installed nothing seems to work. I have tried it with and without the front panel card.
?
When I plug the SIO card in the only thing that happens is the LEDs flash a few times then stay on or turn off. Nothing comes out over the terminal connection (assuming the setting are the same as the front panel settings, which work fine). As for troubleshooting, I have checked to make sure there is no solder bridges that are obvious, and I tried to reflow the joints to be sure I didn't mess any up. I reseated the socketed chips and made sure that there was continuity between the pins and the solder joints on the underside of the board. I did replace R6 in a really stupid way because I somehow missed that it was supposed to look like it did. I honestly don't know how I missed that considering all the times I read through trying to figure out where I went wrong. Hopefully I didn't screw it up worse with that.
?
I've swapped the files on the SD card multiple times to make sure I didn't mess that up but I've had no luck with that.
?
And at this point I have exhausted my ability to troubleshoot and I'm hoping someone here can give me a hand in getting this running. I'm sure its going to be something stupidly simple because I always miss the easy stuff.
?
?
I have some closeups of my boards if anyone wants to see them to make sure its not a stupid mistake:?
?
Thanks for any help you can give!
Morgan
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Hello Josh,
I think I connected my multimeter correctly, I put it between the FTDI cable and the terminal on the side, and I ended up measuring ~70mA with the SIO and CPU cards. I tried out the other combinations and got 80mA with the Front Panel connected and 56mA with all cards connected. Unless I made a mistake connecting it looks like its low instead of high. I did find out however that if I have the Front Panel connected and I hit the reset buttons (F and 0) on there the SD card LEDs will flash. So that's something at least. Thanks,
Morgan |
开云体育I have found on my setup that the stacking connectors are particularly sensitive. Sometimes I need to play with the stack to get it working properly.
http://www.classiccmp.org/cini
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From: [email protected] <[email protected]> on behalf of Morgan <mhtbx118@...>
Sent: Friday, September 18, 2020 5:20:26 PM To: [email protected] <[email protected]> Subject: Re: [Z80MC] Unable to get SIO card working ?
Hello Josh,
I think I connected my multimeter correctly, I put it between the FTDI cable and the terminal on the side, and I ended up measuring ~70mA with the SIO and CPU cards. I tried out the other combinations and got 80mA with the Front Panel connected and 56mA with all cards connected. Unless I made a mistake connecting it looks like its low instead of high. I did find out however that if I have the Front Panel connected and I hit the reset buttons (F and 0) on there the SD card LEDs will flash. So that's something at least. Thanks,
Morgan
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Hi Morgan,?
I haven't actually measured the current draw on my boards, but 200mA was a guess at the most it should use.? I think 70mA is good enough. If you put a scope on the UART output and power CPU + SIO board, do you get any output? Scope the UART CS, is it getting addressed? Josh
On Friday, September 18, 2020, 5:20:27 PM EDT, Morgan <mhtbx118@...> wrote:
Hello Josh, I think I connected my multimeter correctly, I put it between the FTDI cable and the terminal on the side, and I ended up measuring ~70mA with the SIO and CPU cards. I tried out the other combinations and got 80mA with the Front Panel connected and 56mA with all cards connected. Unless I made a mistake connecting it looks like its low instead of high. I did find out however that if I have the Front Panel connected and I hit the reset buttons (F and 0) on there the SD card LEDs will flash. So that's something at least. Thanks,
Morgan
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Hi Morgan, Sorry, I missed this email post.? Ok, so where are you at now?? If you boil it down, the circuit either fails because of a bad component or bad circuitry. It's a slow process, but perhaps you can remove most chips and start ohming every trace?? Ohm it along the way from point a to b for shorts with adjacent traces. Cheers, Josh
On Saturday, September 19, 2020, 09:05:10 p.m. EDT, Morgan <mhtbx118@...> wrote:
Hello Josh, Unfortunately I don't have one of those to test with. I'm mostly limited to just a multimeter at the moment. Thanks,? Morgan |
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Hello Josh,
I've got some excellent news! I figured out what the problem was, turns out the UART chip was the issue. I ordered a replacement because I wanted to test the socketed stuff before I started desoldering, and when I replaced it the board started right up! So your initial suspect was the culprit. Thanks a ton for the help, this has been an absolute blast (not a joke, I have been really enjoying working on this). Thanks for your help, Morgan |
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Morgan,? Thank you for the great news.? Hope you get CP/M running too.? That's the part that amazes me, CP/M in the palm of your hand.
On Friday, September 25, 2020, 07:42:00 p.m. EDT, Morgan <mhtbx118@...> wrote:
Hello Josh, I've got some excellent news! I figured out what the problem was, turns out the UART chip was the issue. I ordered a replacement because I wanted to test the socketed stuff before I started desoldering, and when I replaced it the board started right up! So your initial suspect was the culprit. Thanks a ton for the help, this has been an absolute blast (not a joke, I have been really enjoying working on this). Thanks for your help, Morgan |
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