Hi Every one.
I have quite old computer and it has Com connection on the motherboard and I have a long usbasp cable (10 pin) that fits in to, can i use that connection like my usbasp connection?
Thanks.
What computer, what motherboard?
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I doubt it. That com header on your motherboard is likely for an RS-232 serial port.
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Yes, I guess too, rs232 Com connection.
Post a clear photo of the connector…
Probably yes, but only 9 of the pins are actually used.for a typical D9 RS232 connection…
.
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old Desktop pc that has no mark name.
Like this one
What about pin out like usbasp?
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Great Explanation, so it won't work like that. Thanks.
You can use this to convert it to TTL levels if you can find the adapter cable in post #5.
RS232 to TTL
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And if you try to use an onboard serial connector be aware that there were (at least) 2 different pinouts that were dependent on how the 9 pin connector at the other end was laid out. In one the pins were connected sequentially (hand soldered), in the other they were alternating (IDC crimp).
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One more question If I'm wrong please correct me. Could we use Com Port1 like Ftdi232 https://www.electroinvention.co.in/wp-content/uploads/2022/08/ftdi-connection-with-arduino-1.png There is all we need. Rxd Txd DRT Cts Ground maybe we need only Vcc 5V external?
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