Configuring the IBMTDLC Link Service

The IBMTDLC link service is used to connect SNA Server to IBM midrange systems, over twinaxial cable.

Before you configure this IBMTDLC link, you should record the settings on the IBM twinax adapter you installed in your SNA Server PC. The settings you use to configure the IBMTDLC link driver must match those on your adapter.

You can change the value of any of the following parameters. Click on the parameter below to get more information.

Title

Interrupt

I/O Address

Page Address

Workstation Address


Title

Enter a text description of up to 40 characters that will help you to identify this IBMTDLC link.


Interrupt

Select an interrupt setting from 2 to 7. The interupt must be unique and not in use by any other hardware in your server PC.

The interrupt is a signal sent by the IBM adapter card requesting the attention of the CPU.


I/O Address

Select a hexadecimal address of 2xxA, where xx is a value from 40 to 7F (for example, 240A or 27FA).

The I/O address of the IBM adapter card expressed in hexadecimal.  The I/O address you select in this field must match the I/O address setting on the adapter card.

For details on your adapter card's I/O address setting, refer to the documentation included with your IBM adapter card.


Page Address

Select a page address from 0C000 to FC000.

The IBM adapter has 8K of on board memory which must be mapped into the PC's address space. The page address parameter specifies the PC's address that this 8K of on board memory is mapped to. The IBM Adapter requires that the second nibble of the page address have the hex value 'C'.

This gives 16 possible (theoretical) values for the page address. For example, hex YC000, where Y can have any value in the range 0 - F hex (0 -15 decimal).

The address specified must not conflict with any other device or board installed in the PC.


Workstation Address

Select a value from 0 to 6.

The workstation address you select must match the host's workstation address on a twinaxial port.