dlukas@mydland (David Lukas;133B Barker;x2-6145) (12/03/90)
I am posting this to see if anyone can help to fix (or at least diagnose) the following problem I am having. As I will describe, there are workarounds, but I am curious to know what is going on... I own a DTK Tech-1000A, a PC-AT (286) clone. I have been using it for over a year with a US Robotics 2400 baud internal modem and a Hercules-compatible Mono graphics and printer card. When I recently received a serial mouse (Genius brand) I decided to install a multi-serial port (and printer port, and game port) card in the system. Following the jumpering instructions I set the modem for com2, the printer port on the new card to lpt2, and the serial ports on the add-on card to com1 and com3. The modem made a screeching sound and didn't work. After trying various other port configurations on the two cards (modem and multi-port) I tried a different brand internal modem and a different I/O card. In every combination, the modem would not work when the multi-port card was in place. Since I tries so many combinations and configurations, I am left to suspect a problem with the motherboard, although I am not nearly knowledgeable enough to figure out how such a problem would arise. (The system has 640K memory and a 40 MB Everex hard drive with a Winchester controller, if that makes any difference.) For now, I plan to try to make the system work by putting the mouse on one serial port of the multi-port card, and an external modem on the other. Also, I could try the system out with an internal modem and either a single-port serial card or a bus-mouse card, but I am reluctant to do so because I would have to invest more money and I have a hunch it would't work. Anyone have any ideas, or know what components on the motherboard might relate to the COM ports or deal with peripherals in slots? Thanks, David Lukas dlukas@mydland.berkeley.edu dlukas@geoworks.com uunet!bsw!dlukas