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- Adding Communication ports
-
-
- AC.SYS can be inserted into your CONFIG.SYS file to add non-standard
- communication ports for use as COM1, COM2, COM3, or COM4. If your serial card
- uses a hardware port address which your BIOS ROM does not know then that card
- will be unavailable to DOS, The Weak Link and The Also-LAN. With this
- program you can give the BIOS its proper address. Serial card port addresses
- are kept as follows:
-
- word at 40h:0 = COM1
- 40h:2 = COM2
- 40h:4 = COM3
- 40h:6 = COM4
-
-
- This program merely "pokes" a proper port address to the appropriate
- memory address. You must know your card's port address in order to use this
- program. Usually, a card will have several different address options which are
- set via jumpers or DIP switches. Your manual is usually a good place to find
- this information but I have found several Taiwanese manuals with bad
- information. I have several boards which are almost identical but the later
- versions have COM3 at 1F8h even though the manuals clearly state the COM3
- address of the card is 2E8h. Evidently the board was revised but not the
- manual.
-
- Once you find out your hardware's port address then add AC.SYS to your
- CONFIG.SYS file (with the appropriate parameters) prior to The Weak Link or
- The Also-LAN. For example:
-
- DEVICE=AC.SYS COM2=1F8 COM3=2E8
- DEVICE=PM.SYS COM2 <-- Weak Link
-
- This will add COM2 and COM3. Characters can be entered in upper or
- lower case. You cannot add the ":" to the COM name and you cannot add a space
- before or after the "=" sign. The port address must be a hex number. If the
- port address you give is not found then an error message will be printed and
- that parameter will be skipped.
-
- Also note that you can use this program to expand the number of
- available ports beyond COM4. Immediately after the four communication port
- addresses are kept 4 parallel port addresses. If you are using only LPT1 then
- you could use the LPT4 slot as COM8, LPT3 as COM7, and LPT2 as COM6. It would
- be best to use COM8 first, then COM7, etc. But remember that all port
- addresses must be different. Also remember that a special DOS device driver
- must be written in order for DOS to use anything above COM2. These extended
- ports are only available to programs which simply need to know port addresses,
- such as The Weak Link and The Also-LAN.
-
-
- Rick Armstrong
- Caranet Corporation
- Postal Outlet Box 46001
- 1725 Kingston Road,
- Pickering, Ontario,
- Canada. L1V 6P6
- Ph. 416-427-2886
-