BBS: Inland Empire Archive
Date: 04-20-92 (00:37) Number: 81
From: DONN BLY Refer#: NONE
To: JON SPRINGER Recvd: NO
Subj: Re: Comm Port 3 Conf: (2) Quik_Bas
> back of my computer one of the eight slots, is labeled
> com1...This might be the problem, but I had always
> thought com ports were not physical locations in the
> computer.
Actually, the COMx: ports *are* physical locations -- but
are physical in relation to memory not in relation to the
slots on the bus. The area in memory you are peeking and
poking into is actally the table to tell the machine where
these physical locations are in your machine.
> on lpt1...This is rather baffling, is there something I
> have missed? ie, is the above code always supposed to
> be legit?
Assuming that your BIOS Power-On-Self-Test (POST) fills the
table with the addresses for COM3, then it should work.
However, most BIOSs do not do this for you (while COM3 and
COM4 are somewhat standard, there really is no hard and
fast standard that says that they HAVE to located at any
given point).
You might want to check to see what is going on by displaying the values you
are PEEKing. Generally the port address for COM3 is 16
less than the address for COM1 (&H3E8 instead of &H3F8).
So, originally PEEK(&H404) should be 232. If it isn't,
just poke that value into &H400 and see if that works for you.
--- OPMED 3.00
* Origin: The Loft *HST/DS/V42bis* [NC, SDS] (1:236/7)
