IBM 704 manual Setting the Video-Sleep-Register Address J6A2

Setting System-Board Configuration Jumpers

3.Set the BIOS boot block jumper:

a.To remove the write-protection from the BIOS boot block, move the jumper to pins 2 and 3.

b.To set the write-protection on the BIOS boot block, move the jumper to pins 1 and 2 (factory default).

4.If you removed the processor board, install it (see steps 12 on page 108 through 12e on page 110).

5.Complete the installation (see “Completing the Installation” on page 201).

Setting the Video-Sleep-Register Address (J6A2)

Before you start, be sure that you have:

ŸRead “Electrical Safety” on page 75 and “Handling Static-Sensitive Devices” on page 77.

ŸRemoved the left side cover (as viewed from the front of the server; see “Removing the Side Covers” on page 81).

The Video-Sleep-Register jumper determines which I/O port the SVGA controller uses for its internal AT mode setup port. The starting address of the default port is 03C3H (pins 1 and 2). When this jumper is set to pins 2 and 3, the Video-Sleep-Register address changes to 46E8H.

If no keyboard activity occurs after a specified timeout period (1 to 128 minutes, as specified through the Setup program), the Video-Sleep-Register jumper blanks out the monitor screen. When this happens, you must enter a password to reactivate the monitor and keyboard.

296PC Server 704 User's Handbook