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Hacking the Clover POS tablet (Read 21 times)
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Hacking the Clover POS tablet
Jan 23rd, 2023, 7:25pm
 
Hacking the Original Clover Station POS (C100) tablet.
 
The Original Clover Station has been considered "End of Life" by Clover Network Inc., and replaced by a number of different hardware POS devices.
 
Since the Original  Clover Station POS (C100) is no longer supported by Clover, these devices are now found in quantity on the surplus market.
 
The basic clover hardware is actually pretty nice -- especially for when it was released in 2014.  It consists of a good quality 11.6", 1366x768 Touch Screen Display driven by a NVidia Tegra 3 SOC.  It features 1G of RAM (Which was sufficient for the versions of Android that existed at the time), and 8G of flash.  It runs a customized version of Android 4.2.2.
 

 
So can these be converted into a regular tablet, or repurposed for other uses?
 
Physical:
 
Before getting much further into this, I will say that we are dealing with proprietary hardware and software here.
 
I will also say that I got mine (Tablet only) for $10, and I only got it yesterday.  This will be updated as I learn more.
 
Much of the Clover Station functionality is actually in the printer.  The printer connects to the "Tablet" (The Clover Touchscreen Display) via a proprietary cable.  The power supply, and breakout to standard ports in all done inside the printer.  The printer is powered by a 24V, 5A Power brick.  In addition to the power jack, and the proprietary interconnect port, the printer also contains 4 standard USB ports, and Ethernet port, and an RJ12 connector that is intended for an optional cash drawer or other accessories.  This may be some sort of serial port.
 
So in functionality, the Printer contains something similar to a USB travel hub with Ethernet.
 
The proprietary cable that connects to the Tablet contains the following as far as I can tell:
  • Unregulated Power to the Tablet
  • Two (2) Partial USB ports
  • Ground

 
More specifically, here is the Pinout of the 12 Pin connector inside the tablet:
Pin 1 is at the bottom in the following picture (near the circle).
 
1.   +Power
2.   +Power
3.   No Connection (No contact on the Motherboard connector)
4.   USB 1 Data  -
5.   USB 1 Data  +
6.   Ground
7.   USB 2 Data -
8.   USB 2 Data +
9.   Unknown Black Wire (no continuity to ground)
10. Ground
11. Ground
12. Ground
 
Notes:
  • All grounds seem to be the same, and the same as chassis/shielding ground.  I have not found any separate ground.
  • The Power supplied to the Display Tablet section seems to be an unregulated or higher voltage.

A Little More About the Power:
I am not sure if it directly fed from the +24V power brick.  All I can say is that it must be enough to run the 5 VDC Buck converter (Red Square shown in the picture).  Mine starts up at about 6.7 VDC.  At this supply voltage, the tablet section draws about 800mA.
 
For testing, I soldered a short length of wire to positive side of the filter capacitor that is right next to the interface connector. This prevents damage to the connector.
 
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