🚀 go-pugleaf

I asked the following question already some weeks ago but did not get
any response, so I am trying again...

I bought IBM OS/2 1.2 in April (this is the second, updated release of
1.2 from IBM) and installed it on and AT-bus machine with an 386/24
MHZ, C&T board, AMI BIOS. I use a Paradise VGA-1024 with an analog
multisync display and have a second, monochrome display card (Hercules)
with a TTL monochome display attached.

The system runs nearly complete (see next article(s)) but I have
problems with the secondary display. Usually, MODE MONO is used to
switch a fullscreen session to the mono card. This works fine under DOS,
works also fine with and OS/2 1.1 (the one from the 1.1 SDK which I had
an opportunity to try first) and even in the DOS box of my IBM 1.2 OS/2.

The IBM 1.2 cannot switch to the mono card with MODE MONO. The session
continues to stay on the VGA but apparently switches the VGA to mono
mode which interferes with the video memory of the mono card at B000 and
both cards display the same picture (i.e. text) but the Hercules card
looses vertical synchronization (perhaps because the VIO subsystem
writes to the VGA through ports which interfere with the mono card's
controller).

Also, although MODE MONO works in the DOS box, I get the same mess when
I switch back to PM and to the DOS box again while I left it in mono mode.

The MODE program seems ok because I wrote a small program with the VIO
calls needed to switch to the mono card but had the same results. The
bug seems to be in the VIO subsystem.

I need the mono display for CVP to debug PM applications. CVP/2 works
only in fullscreen VGA sessions for non-PM apps but not for PM programs.
For PM programs, I have to switch to the secondary card and then use CVP
without /2 option (according to MS documentation).

Any hints ? Is there a fix available ?
Does anyone else use OS/2 1.2 from IBM with two displays ?

Does a 8514/A in addition to a VGA give you the possibility of
two-monitor-debugging with the 8514/A display for the PM and the VGA
display for CVP ?

Thanks in advance,

Kai Uwe Rommel
Munich
rommel@lan.informatik.tu-muenchen.dbp.de