Antex Electronics SX-26 Digital Audio Adapter - Manual (Page 10)

7
I/O ADDRESSES AND INTERRUPTS
The valid I/O addresses for the SX7, SX9, SX11, SX-12a, SX20,
SX22, SX23e and SX26 are:
180h, 22h, 280h, 300h, 320h and 380h
The valid interrupts are:
2, 3, 4, 5, 10, 11 and 12
SX-12a, SX-20
There are 5 external connections located on the front surface of
the audio board's metal bracket (Fig. 3).
Audio Input:
Line: RCA jacks, 2VRMS/+6dBV max (digital clipping),
with an impedance pf 20 k ohms
Audio Output:
Headphone: 1/4" stereo phone jack, 0.5 VRMS into 8
ohms
Line: RCA jacks, 2VRMS/+6dBV max (digital clipping),
with an impedance of 470 ohms and a load
impedance of >10k ohms
SX-7
There are four external connectors located on the SX-7 audio
board's metal mounting bracket. See Figure 4. There is also one
three pin header (JP1) for an optional user-supplied headphone
connection, which would allow for a front panel headphone jack.