hb@vpnet.UUCP (hank barta) (02/02/90)
(Here I go again... Several days ago I advised someone that COM3,COM4 were not supported by SCO - They may be for certain configurations.) The devices tty01..tty12 refer to virtual consoles on a PC (accessed by pressing <alt fn> n=1,12). The actual serial devices are tty1[a-h] and tty2[a-h]. The numerals refer to which COM port IRQ line the device uses. The alphas (a-h) refer to a port on the controller. A single serial port card, such as those most commonly used under DOS, would use the letter 'a'. The multi-port cards, such as a Digiboard-4 or Digiboard-8, would use a-d or a-h to refer to the ports. For example, a single serial port known as COM1 under DOS would be called /dev/tty1a under SCO UNIX (and I would guess the same is true of XENIX). Note that SCO provides different drivers depending on whether the line includes modem control. For modem control, the alpha character is capitalized. For example, the device I am using to make this call (COM2 under DOS) is /dev/tty2A. I'm not familiar with your particular board, but I hope this explanation helps to clear up the naming issue of the serial devices.