CompuServe Messages

Don, I didn't think it was the serial card because regular characters that are being sent over have no problem. For example, I downloaded using YMODEM a very large file (180K) with no retransmissions or errors whatsoever. Like I stated earlier, normally characters are not dropped. Only when the character sequence is being used for cursor control at the PC while someone is simultaneously typing is there a problem. Now the modem wouldn't know what the characters are being used for…As another test, I composed a file on the remote host that had the cursor escape sequence in it, and had the remote "type" the file out. I then captured the characters coming in, and nothing was dropped. It appears to me that somehow, there is an interaction going on between the keyboard, screen and modem. For example, while the PC is handling keyboard interrupts, is it possible to loose characters coming in on the serial port? Such a problem, I suspect would be in the ROM BIOS. (I tried different versions of MS-DOS with the same result). What do you think? John