NEC SP B-Series - Manual (Page 14)

Technical Information 1-3
Rear Features – Desktop Models
A – Power Socket B – Mouse Port
C – Parallel Port D – Keyboard Port
E – USB Ports F – Serial Port 1
G – Serial Port 2 H – Audio Connectors
I – Video Connector
Audio Connectors – Desktop Models
A – MIDI/Game Port B – Line Out Jack
C – Line In Jack D – Microphone Jack