COM.SYS
This driver loads the serial port support to be used by an external device like a modem. There is also available COM02.SYS which is available for the Micro Channel architecture.
Version
| Date | Version | Size | Comments |
|---|---|---|---|
| 2002-04-15 | 10.056 | 19,743 bytes | |
| 2002-08-13 | 10.070 | 25,335 bytes |
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).
| OS/2 2.x | OS/2 3.0 | OS/2 4.0 | OS/2 4.5x |
|---|---|---|---|
| Yes | Yes | Yes | Yes |