The Forvus Line of Coax Adapters are register level compatible with the IBM 3278/79 ISA coax adapter with a few exceptions. There are limits imposed by the Plug and Play specifications, which prevent 100% compatibility.

The original IBM 3278 adapter uses a fixed memory range (CE000-CFFFF), I/O range (2D0-2DF), and IRQ 9. The Forvus 3270 Coax Adapter - ISA Legacy (P/N 70000) uses these resources exclusively. The Forvus 3270 Coax Adapter - ISA PnP is assigned resources by the Plug and Play BIOS of the PC and it is not possible to have fixed resources. Windows 95/98 allows modification to these resources through the Control Panel/System/Device Manager. If the resources required by a third party emulator are not used (or can be moved), the Forvus Coax adapter's settings may be moved to match those settings.

The following example will explain the steps necessary to install IBM Personal Communications software with the Forvus Coax adapter - PnP.

1) Install Forvus Coax Adapter - PnP in an empty slot of your PC and power on the PC. 

2) Windows will detect the adapter and register it in the Device Manager.

3) Click "My Computer" and select Control Panel. Under Control Panel, select "System"

4) Under "System Properties" select the "Device Manager" tab.

5) Under "3270 adapters" select the Forvus Coax adapter - PnP and press "Properties".

6) Deselect the "Use Automatic Settings" check box. Select Memory range and click "Change Settings" button.

*If Windows 95/98 reports "This resource cannot be modified." Click the "Cancel" button and proceed to the PNP/PCI BIOS Settings found below.

7) Change the memory range to 000CE000-000CFFFF.

8) Select the I/O range and click "Change Settings" button.

9) Change the I/O range to 02D0-02DF.

10) Click "Ok" to exit the Control Panel. Reboot the PC to allow the new settings to occur.

The Forvus adapter is now set to the IBM register compatible mode of operation.

11) If not already installed, install your IBM Personal Communications emulator.

12) Configure a Personal Communications for an ""interface Type" of coax, 
"Adapter Number" of 0, "Buffer Address" of CE000 and save the profile (by default, the profile is saved in the directory C:\Program Files\Personal Communications\Private with an extension of .ws)

13) Using Notepad, edit the profile file saved in step 12. After the last line of the [CSDFT] section, add the following line.

POLL=Y

and then save the modified file.

14) Restart the PC and the installation is complete.

Depending on the model and manufacturer of your PC, you will need to access the setup of your system's BIOS setup.