Typically, that is the correct address for com1. Com 2 is IRQ 3, and
2F8. Com 3 and 4 if they are supported by the bios are 3E8, and 2E8
generally.
I've unfortunately never had a dos machine with all 4 com ports active.
I've used com 3 or 4 periodically with an additional com card, but it
didn't have both com ports on it, and I never had a motherboard that
supported all 4 com ports, but the address 2E0 is not typically
associated with a com port, neither are the various IRQs listed in the
snippet below. Normally the com ports are on com 3 and 4, though I
think it was possible to switch irqs for com3 and com4 to be on
different irqs, in case you wanted to use multiple com ports at the same
time.
(multiple being more than 2 at a time in this case).
Part of it may depend on the software you're using to access the com
port as well. The driver should handle the translation to/from irqs and
port addresses, so you may not need to worry about that, but you do need
to know what to talk to on your end of the connection to make it all work.
I've only used screens like you're describing on SBC (single board
computers) like the propeller board from parallax, so I can't offer
anything else to point you in a direction for troubleshooting other than
what I've offered above. Perhaps something here will make a connection
and you'll be able to solve it.
On 3/17/2024 5:10 PM, Thomas Cornelius Desi via Freedos-user wrote:
For some experimental reasons I got a 19« 3M Touchscreen for the RS-232 Port.
(I attached the VGA cable and the RS-232 cable on both sides)
(The monitor is functional as a monitor-only. Seller tells me touch function is
working…)
My question is about the RS-232 COM1 port.
The AMBIOS (my BIOS on the machine) says that the COM1 port address is
3F8h/COM1 Enable onBoard Serial port 1 and address is 3F8h.
- I am installing from a USB Stick (= c:\) (=source drive?)
- port address I wrote: 3F8
- interrupt Number: 4 (??? no clue)
The DOS driver directory the seller sent me contains some installation info,
the examples given differ much from what I set and - of course it does NOT work.
Any ideas someone around?
Much appreciated,
regards, Thomas
================driver info===================
DOS Only Installation:
From the installation drive type:
INSTALL k: /Axxx /Inn
k source drive
xxx port address: 2E0, 320 or 330
nn interrupt number: 9, 10, 11, 12 or 15
The software is copied to
c:\mts\touch
You will see that the installation program tries to connect to the touch
controller by varying COM port speed and parity and, if found, sets the
line parameters to
2400 baud
8 data bits
1 stop bit
no parity
=========================================
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