This slot uses a 46-pin, 50-position PCI-like connector; 2 pairs of positions are occupied by key.
This slot may be designated as slightly repositioned cutted 3.3V PCI slot: short parts of AMR and PCI slot have equal length (it made ACR - an extension to AMR - possible with use of standard PCI connector).
As PCI, AMR may share its place with ISA slot.
Generally, color of slot is grey-brown.
Component (primary) and solder (secondary) sides of board are identical to PCI.
Pins are counted from card bracket to the deeper edge of board; B is primary side of board, A is secondary (as with the PCI).
Connector is divided into 2 sections by a key, as in PCI.
Instead of PCI-like numbering of contacts, AMR does not specify numbers for positions occupied by key. For example, 3.3V PCI slot ends its first part at A11/B11, and starts second at A14/B14 (as these 12th and 13th positions may be populated in 5V slot), but AMR continues at A12/B12, because populating the key area with contacts is not planned.
B1
AUDIO_MUTE#
AUDIO_PWRDN
A1
B2
GND
MONO_PHONE
A2
B3
MONO_OUT/PC_BEEP
RESERVED
A3
B4
A4
B5
A5
B6
PRIMARY_DN#
A6
B7
-12V
+5V dual / +5VSB
A7
B8
USB_OC#
A8
B9
+12V
A9
B10
USB+
A10
B11
+5V Digital
USB-
A11
Keyway
B12
A12
B13
S/P-DIF_IN
A13
B14
A14
B15
+3.3V Digital
+3.3V dual / +3.3VSB
A15
B16
A16
B17
AC97_SDATA_OUT
AC97_SYNC
A17
B18
AC97_RESET#
A18
B19
AC97_SDATA_IN3
AC97_SDATA_IN1
A19
B20
A20
B21
AC97_SDATA_IN2
AC97_SDATA_IN0
A21
B22
A22
B23
AC97_MSTRCLK
AC97_BITCLK
A23