2SIO silkscreen error
If you're building one of Grant's 2SIO boards, be aware that the silkscreen is incorrect for D3, D6, D9, D12, D15 & D18. The cathode should be up toward the Molex connectors, instead of down as shown on the silkscreen.
This matters only if you are configuring the board for a current loop device, those diodes are not used if you are configuring it for RS232. Geoff. |
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Tom L |
silk screen
Hi Geoff;
THANK YOU THANK YOU for your excellent work , again... Now if I could get my 2-sio to work with a mbl prom or a debug eprom, I would be happy if I could get my s-io (single port) to work with either... :( :( THANK YOU Marty |
I just confirmed that there was a mistake on the boards. The diodes are correct on the board scans, but when I was done processing the artwork they are flipped. I don't remember exactly how I processed the artwork...but I do know I used the same diode stamp fo all the positions. I must have flipped it for the bottom 8 diodes and not noticed for the top???
If I decide to make more 2SIO boards I will fix the problem. Thanks for finding that! If you've sent me an e-mail in the last few days, I will try to answer it tonight. I changed the settings for "non unicode" programs to Korean and now most of my Eudora filters don't work. I'm slowly changing all of the filters to work and I should be able to get to the e-mails tonight. Right now there are a few good e-mails in a sea of mailing list subscriptions! :( |
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but... the pulses arriving at the UART are very messy (see the scope trace below) and I'm not sure why. The UART can't handle it. I'll play with it a while longer, but I think it makes most sense to convert it to RS232. As you said elsewhere, it will make for a more versatile interface. http://www.solivant.com/misc_images/icK-8-9.jpg The bottom trace is the input to IC K pin 9, which is supposed to be more or less TTL, the top trace is the output from IC K pin 8, which should be a clean TTL square wave. Geoff. |
2sio
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Tom |
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Did you verify that you can drive your asr33 with your adapter correctly? If so, then switching the 2SIO port to RS232 should get you up and running. Geoff. |
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Thanks! Tom |
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