AMT Datasouth M7 - Manual (Page 10)

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2.2.3 Rear View
1. Fan-fold paper entrance chute
2. Centronics interface
3. USB interface
4. RS-232C interface
5. Power jack socket
6. GPIO interface
*7. SD card slot
8. Ethernet interface
9. PS/2 interface
10. Power switch
* Recommended SD card specification.
SD V 1.0, V 1.1 SD V 2.0 (SDHC)
128MB
256MB
512MB
1GB
4GB class 6
-Supported DOS FAT file system.
-Folders stored on the SD card should be in the 8.3 filename format.
-Approved SD card manufacturer: SanDisk, Transcend.
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Note:
1. SD card slot, Ethernet interface and PS/2 interface are standard
interfaces for M7 PLUS models, but optional for M7 non-PLUS
models.
2. GPIO interface card includes SD card slot, Ethernet and PS/2
interfaces. So GPIO interface is an factory option for M7 PLUS ,
but a dealer option for M7 non-PLUS models.