Servus Rainer,

the sco box was virtualized into an vmware 1.0.9 server. this is an outdated product, like the sco server itself

I used Acronis true image to get the data into the vmware, by backuping (take a image, without compression) from the baremetal installation and restoring it on a vmware hard disk.

Set up your virtual machine as other / other, 256 MB ram, 1 CPU, SCSI HDD, Floppy drive, network.
You have to choose a (Buslogic) SCSI controller.

I have to admit, i cannot remember every little step i did in 2009 to get the sco box work.

On vmware 1.0.9 i had to use the pnt lan driver. you can get it from sco ftp.
On newer vmware you can use an intel nic driver like described here: VMware Documentation for SCO OpenServer 5.0

As i remember, i had to boot from a disk with the right scsi controller driver (blc). This should do it for actual VmWare ESX Server too.

i think this link could help you:
SCO Unix 5.0.4 on VMware <- Aplawrence

you have to load the boot disk (i think the Buslogic (blc) disk is bootable, see Aplawrence mmunix.exe or my images below for download), after that, install the driver using btldinstall. you can take the right defbootstr from the applawrence link.

the blc driver i used is extracted from the mmunix.exe (link on applawrence), written by a windows 98 virtualbox on a virtual floppy disk (blc_treiber.img 1,4Mb) and reduced by a linux using dd to 720kb (blc_treiber_red.img)

you need the reduced disk to mount it on the vmware (not on startup, just when you are using "mount" within the sco box). The full disk will not be recognized. that is because SCO somehow recognizes that this is a virtual floppy disk and so it accepts only 720 kb at run-time (not on startup)

here the links for the driver:
http://usb-culture.de/driver/blc_treiber.img
http://usb-culture.de/driver/blc_treiber_red.img