PCI-1761 driver

i searched the archive but i couldn't find any information about it:
 
i got this PCI-1761 advantech card
Advantech talks about the comedi-0.7.60/comedilib-0.7.19 installation in
their "device driver for linux" user manual.
(http://ae.advantech.com.cn/wwwroot/aeuser.nsf/0/8023dc858bbc9b1a48256dc
e00250188/$FILE/user%20manual.pdf)
 
this comedi/comedilib version works fine with that pci 1761 card
 
i also downloaded the most recent versions of the comedi/comedilib and
discovered that the pci digital i/o cards are
gathered in this one adv_pci_dio.c file.
 
however the pci-1761 is not supported there while the pci-1762 is, and
they are quite similar i think.
 
my question: why is the pci-1761 no longer supported?
 
Joost