Sony pcv-rx740 Verweishandbuch

There are five expansion slots (see 

Expansion (slot No.1) is occupied by the fax/modem card. A V.90 
compatible modem has two jacks (Telephone and Line).

*

Expansion (slot No. 2, 3, 4, and 5) are available for expansion.

* Your system has five expansion slots, however, only four slots are visible from the back panel.

Slot No. 5

Slot No. 4

Slot No. 3

Slot No. 1/2