Umh... To configure Telix under DOS you need to provide the first I/O port
and IRQ, so I guess it talks to the hardware directly. Also the other side
(minicom under Linux) works according to selected communication speed with
Telix on the XT side. Also, ELKS has I/O ports hardcoded, so I doubt it
communicates with BIOS for serial I/O, see in
elks/arch/i86/drivers/char/serial.c:
static struct serial_info ports[NR_SERIAL] = {
{(char *)0x3f8, 4, 0, DEFAULT_LCR, DEFAULT_MCR, NULL},
{(char *)0x2f8, 3, 0, DEFAULT_LCR, DEFAULT_MCR, NULL},
{(char *)0x3e8, 5, 0, DEFAULT_LCR, DEFAULT_MCR, NULL},
{(char *)0x2e8, 2, 0, DEFAULT_LCR, DEFAULT_MCR, NULL},
};
static char irq_port[NR_SERIAL] = { 3, 1, 0, 2 };
Port 3f8 is the one I entered in Telix under FreeDOS.
On Mon, 17 Feb 2020, Georg Potthast 2 wrote:
> Hi Paul,
> I recall that DOS used the BIOS to send and receive data via the serial port. This resulted in a usable speed of 1200 baud max. Lower speeds were more reliable. Therefore all communication programs used interrupt driven data input and no DOS or BIOS calls. I assume ELKS also uses the BIOS and therefore you are limited to 1200 baud in case of a 8086 processor and have to expect missing data then.
>
> Georg
>
> > Paul Osmialowski <pawelo@xxxxxxxxxxx> hat am 17. Februar 2020 um 00:26 geschrieben:
> >
> >
> > Hi Georg,
> >
> > I'm using null-modem cable I've made myself and been using it for years
> > (it corsses-over Rx/Tx and hardware control lines). It works nicely with
> > Telix running under FreeDOS on my XT and minicom on 'big' Linux, at speed
> > 115200, which is the top speed for 8250 chip on the XT side.
> >
> > With ELKS it's not that nice. I've managed to configure getty in
> > /etc/inittab to use /dev/ttyS0 at the default speed (9600bps), and it
> > kinda worked, except it was losing bits from time to time. I'd removed
> > getty line from /etc/inittab for other experiments, then I've tried to
> > 'cat' some text files between ELKS and Linux (and vice versa), and
> > although a text sent from ELKS to Linux looked good, the other way round
> > it was disaster. I've tried different speeds (using 'stty' on both sides).
> > Finally, it looked almost OK at 1200bps, but still I had an impression,
> > bit-banging serial port on my old ZX Spectrum +3 offered better
> > communication stability at 4800bps than this!
> >
> > Eventually, I've managed to establish SLIP connection between ELKS and
> > Linux, with telnetd running on ELKS, and I could open telnet connection
> > that worked for a while... not too long though. I guess, serial connection
> > support must be looked upon in ELKS before doing experiments with SLIP.
> >
> > Trying to follow your instructions, I've encountered some problems with
> > the 'ifconfig' line:
> >
> > - there's no 'up' param in your example; usually I'm adding it after the
> > interface name (e.g. 'ifconfig sl0 up ....'),
> >
> > - the destination address option is different in various versions of
> > ifconfig; in your example it was 'pointtopoint', but my 'ifconfig' didn't
> > like it; turned out, in my case it should be 'dstaddr' (which some googled
> > pages listed as obsolete).
> >
> > Thanks,
> > Paul
> >
> > On Sun, 16 Feb 2020, Georg Potthast wrote:
> >
> > > ELKS does NOT have a special version of SLIP. Therefore you can communicate
> > > with any Linux host provided you manage to configure this. I would recommend
> > > to follow my instructions first to get an understanding how to set this up.
> > > Then make a serial cross over connection cable and test that using two
> > > terminal programs on each side. Getting the wires linked correctly and
> > > providing the hardware signals is not trivial for someone who has not done
> > > that before. If you can send across what you type you can start configuring
> > > SLIP over this line.
> > >
> > > Georg
> > >
> > > -----Ursprüngliche Nachricht----- From: Paul Osmialowski
> > > Sent: Sunday, February 16, 2020 7:37 PM
> > > To: Georg Potthast
> > > Cc: Paul Osmialowski ; Derek Johansen ; Marc-F. Lucca-Daniau ; ELKS
> > > Subject: Re: Obsolete documentation?
> > >
> > > Hi Georg,
> > >
> > > Will it connect to SLIP/CSLIP interface as implemented in normal Linux
> > > kernel (CONFIG_SLIP)?
> > >
> > > Thanksm
> > > Paul
> > >
> > > On Sun, 16 Feb 2020, Georg Potthast wrote:
> > >
> > > > I wrote a SLIP documentation which shows how to setup a SLIP connection
> > > > between an ELKS system running in QEMU und the host where QEMU is running.
> > > > You
> > > > could send data from the host to the ELKS system and vice versa. This is
> > > > this
> > > > document:
> > > > elks/Documentation/html/user/setup_slip.html
> > > > To me this seemed easier to set up instead of two ELKS systems connected
> > > > with
> > > > a cross-over serial cable.
> > > >
> > > > Georg
> > > >
> > > > -----Ursprüngliche Nachricht----- From: Marc-F. Lucca-Daniau
> > > > Sent: Sunday, February 16, 2020 6:05 PM
> > > > To: Paul Osmialowski ; Derek Johansen
> > > > Cc: ELKS
> > > > Subject: Re: Obsolete documentation?
> > > >
> > > > Hello Derek and Paul,
> > > >
> > > > ELKS is indeed still SLIP capable :
> > > > https://github.com/elks-org/elks/issues/304
> > > >
> > > > One has just to change the command line of 'ktcp' to remove Ethernet and
> > > > put back SLIP.
> > > >
> > > > Documentation is quite outdated. Georges made an effort to document
> > > > Ethernet and some other things while debugging networking features, but
> > > > there are still many legacy documents that need to be reorderer and updated.
> > > >
> > > > Thanks,
> > > >
> > > > MFLD
> > > >
> > > >
> > > > Le 16/02/2020 ? 12:08, Paul Osmialowski a écrit :
> > > > > So what happened to SLIP support in ELKS? 8-bit ISA ethernet cards
> > > > > (with RJ-45 connector) are very rare (I have only one of them, work >
> > > > nicely
> > > > > under FreeDOS and in theory it should be supported by ELKS's ne2k >
> > > > driver,
> > > > > but it isn't). Within my one more XT machine to play with ELKS, serial
> > > > > port is the only means of external communication. PPP/IP or SLIP is
> > > > > something ELKS should definitely have IMHO.
> > > > >
> > > > > Cheers,
> > > > > Paul
> > > > >
> > > > > On Sat, 15 Feb 2020, Derek Johansen wrote:
> > > > >
> > > > > > Does elks/Documentation/text/networking_guide.txt make
> > > > > > elks/Documentation/text/networking.txt obsolete? The latter in
> > > > > > Section 2 says ELKS only supports SLIP connections. I don't think
> > > > > > this is still true?
> > > > > >
> > > >
> > >
>
