Michael Polak wrote:
> 
> I failed to setup serial connection between COMTOOL 
> as terminal on DOS (HP-CX) side and MINICOM on Linux 
> side (/dev/modem linking to /dev/ttyS1, where laplink
> is connected...)

Have you tried activating /dev/ttyS1 in 
/etc/inittab ?  In Slackware you do this 
by removing the # in this line:
-------------------------------------------------
# s2:12345:respawn:/sbin/agetty 19200 ttyS1 vt100
-------------------------------------------------
Once this is done, you can use a terminal program
on the DOS side and log into Linux via /dev/ttyS1.

> Is it possible to setup PPP connection over standard 
> HP-CX(LX) laplink cable ? 

First, I suggest you establish a TCP/IP connection
using the ETHERSLIP packetdriver. 

On DOS machine:  192.168.1.2
^^^^^^^^^^^^^^
ethersl 0x60 4 0x3f8 57600    (for com1)
-or-
ethersl 0x60 3 0x2f8 57600    (for com2)

On Linux machine:  192.168.1.1
^^^^^^^^^^^^^^^^
slattach -p slip -dvs 57600 /dev/ttyS1 &
ifconfig sl0 192.168.1.1 pointopoint 192.168.1.2
route add 192.168.1.2   

> I am not sure if null-modem cable and laplink 
> cables are the same, or not.

Same.
 
> Now I would like to start experimenting with getting online 
> with stripped down version of Arachne running on HP-CX 
> palmtop (1 MB RAM, XT-compatible, 8 Mhz, CGA card...), either
> against PPP server running on my Linux, 

Once you have the SLIP TCP/IP connection between the palmtop
and the Linux machine, it can be routed to the PPP connection
via IP masquerading.

Cheers,
Steven

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