i just got a new computer which doesnt have regular serial ports, but i did get a free EVAL232R that out puts TX/RX etc signals in ttl format from USB. so i hooked it up and installed the drivers, but it wont upload anything, of course. TXD of the eval is going to RX on the arduino and RXD is going to TX. previously this arduino was using a MAX232 and the serial cable and worked fine. It is a breadboard duino with the optiboot(UNO) bootloader on a 328p. so then i connected RX and TX of the EVAL together and i got the echo. so im guessing it something to do with serial port settings in device manager; mine are 9600 8N1. i changed it to 115200(the uno upload speed) but no go.
oh, and when it doesnt upload it says 0x00. so it seems like no connection at all. swapping rx/tx doesnt help. neither does manual reset.
what do ya think? sorry to post this, but i have tried all the common causes and i have run out of ideas.