COM.SYS

Product Support
OS/2 1.3
OS/2 2.0
OS/2 2.1	S
OS/2 2.11 SMP
OS/2 Warp 3	S
OS/2 Warp Connect	S
OS/2 Warp 4	S
OS/2 Warp Server for e-Business	S

Asynchronous Communications Driver used by an external device like a modem. There is also available COM02.SYS which is available for the Micro Channel architecture.

CONFIG.SYS

This driver is required for serial communications.

DEVICE=C:\OS2\BOOT\COM.SYS <parameters>

TIP

below. This line MUST appear after any driver that uses a communications port. Older versions of COM.SYS are limited to 57600 Baud, newer ones (e.g. delivered with Warp 4) are able to do 115200 Baud. Beginning with build 10.042 PCI Add-On cards with implemented software interrupt sharing are supported too, beginning with build 10.052 there are 16 com ports available and beginning with build 10.068 Combo Cards are supported.

TIP

There are two very good replacement drivers called SIO.SYS\VSIO.SYS.

TIP

To add support for COM3 and COM4 at location 3E8 with IRQ 4 and 2E8 with IRQ 3 respectively, add (3,3E8,4) (4,2E8,3) to the DEVICE line, e.g.

DEVICE=drive:\OS2\COM.SYS (3,3E8,4) (4,2E8,3)

You can also use this method to change a COM ports assigned IRQ. The normal address for COM1 is 3F8 and IRQ 4, for COM2 2F8 and IRQ3.

TIP

With ThinkPads should the address be added. e.g:

DEVICE=drive:\OS2\BOOT\COM.SYS (1,3F8,4) (2,2F8,3)

Parameter

/V

Verbose (since 10.052)

/W

Wait verbose mode (since 10.052). Displaying pauses with a "Press Enter to continue..." message.

/F

Find COM ports on PCI combo (serial/parallel) cards automatically (since 10.068).

Versions

Date	Version	Size	Comments
2002-04-15	10.056	19,743 bytes
2002-08-13	10.070	25,335 bytes