Hi all,

I have been building some stuff using the built in USART on the PIC16C65A
and PIC16C67. I am having some _STRANGE_ trouble, though. If I write code
that does an interrupt driven loopback at 115200 on the C67, It works on my
486DX and Pentium 200. However, when I take it to two of my friends' houses
and try to use it on their computers, a 486SX and Pentium 100, many of the
characters come out garbled. I also made a device which used a PIC16C65
running at 38400 in low baud rate mode (BRGH=0). It ran fine on both of my
computers, as well as an 8088 laptop, but for some reason it has difficulty
with both of those other two computers (the 486SX and Pent 100). Both of
these computers have known working serial ports. I am using a MAXIM serial
comverter chip, not some jury-rigged level converter scheme. I'm not sure
if the problem is in RX only,TX only, or both.

Anyone have any suggestions or experience similar problems?

Thanks,

Sean
Sean Breheny,KA3YXM
Electrical Engineering Student