I got a PC Clone from the thrash and found it working perfectly. It's a TI 486SLC33, 4MB RAM and 270MB HDD with MSDOS 6.22 installed. I added a program to work with a serial Microcontroller programer for embedded design. The program says the device is not found at COM1, So I changed to COM2 and didn't work either.<br>I thought the ports were damaged, so I changed the serial card. Nothing worked. I changed Motherboard 3 times (i486, Cyrix586, AMD K5), but not to avail. I changed HDD and booted Win95, Win98, nothing. The only thing that remains from the original "Rescued" PC is the metal case and the Power Supply. But I checked out voltages and the don't lower when loaded (PC turned on). What's going on? Of course I tested the device in lots of computers and it always worked fine. Did I get Gremlins? Does that PC belong to the twilight zone? Is the device angry cause I connected it to a less-than-Pentium system?<br>Help!