Sony PCV-E203 - Manual (Page 55)

System Board 47
Slot Connectors
There are a total of three slot connectors: one ISA (slot #1) and two PCI
slot connectors (slot #2 and #3). The ISA slot is occupied by the fax/
modem card. The two PCI slot connectors are available for PCI cards.
ISA Slot Connector
✍
Slot #2 and #3 (PCI) connectors do not support bus mastering.
A1 A49 A31
B1 B49 B31
OM04712A.VSD