The RBT-820 was announced back on January 10 2007 at the same time as as the RBT802. The press release implies that the underlying hardware is identical with the RBT-802 being Linux based whilst the RBT-820 runs Microsoft's CE.Net.
The 820s I got came fitted with wireless LAN cards.
The early examples I have use the 'gorabbit' logo rather than the later 'RBT' version.
AMD Geode LX800
256MB (max 1GB)
1920x1440 ?-bit colour
4 x USB2.0
12V 1.2A (datasheet)
Dimensions H x W x D (mm) 35 x 140 x 130
This appears to available with Linux (RBT-802) or Windows CE.Net (RBT-820)
The unit requires a 12V supply and uses a conventional 5.5mm/2.5mm coax connector. (My test PSU drew 4W with nothing connected to its output).
Having booted Tinycore, /proc/cpuinfo shows:
vendor_id : AuthenticAMD cpu family : 5 model : 10 model name : Geode(TM) Integrated Processor by AMD PCS stepping : 2 flags : fpu de pse tsc msr cx8 sep pge cmov clflush mmx mmxext 3dnowext 3dnow eagerfpu 3dnowprefetch vmmcall
The Linux lspci command shows:
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] CS5536 [Geode companion] Host Bridge (rev 30) 00:01.1 VGA compatible controller: Advanced Micro Devices, Inc. [AMD] Geode LX Video 00:01.2 Entertainment encryption device: Advanced Micro Devices, Inc. [AMD] Geode LX AES Security Block 00:0d.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8139 PCI Fast Ethernet Adapter (rev 10) 00:0e.0 Network controller: VIA Technologies, Inc. VT6655 WiFi Adapter, 802.11a/b/g 00:0f.0 ISA bridge: Advanced Micro Devices, Inc. [AMD] CS5536 [Geode companion] ISA (rev 03) 00:0f.2 IDE interface: Advanced Micro Devices, Inc. [AMD] CS5536 [Geode companion] IDE (rev 01) 00:0f.3 Multimedia audio controller: Advanced Micro Devices, Inc. [AMD] CS5536 [Geode companion] Audio (rev 01) 00:0f.4 USB controller: Advanced Micro Devices, Inc. [AMD] CS5536 [Geode companion] OHC (rev 02) 00:0f.5 USB controller: Advanced Micro Devices, Inc. [AMD] CS5536 [Geode companion] EHC (rev 02)
Of the three hardware revisions I've seen the CS5536 revision numbers vary:
DT166 serial number starts: 1664XNL... has CS5536 (rev 30)
DT166 serial number starts: 166NL... has CS5536 (rev 31)
DT166 serial number starts: 1660L... has CS5536 (rev 33)
You remove the two screws holding the back panel to the case and then the circuit board (complete with panel) can be slid out of the housing.
The circuit board is fitted with a pad below the CPU which I assume is there to assist with transfer of the heat from the circuit board/cpu to the case. As it's slightly tacky it doesn't exactly help with the 'slide' bit - tho' some of my examples show traces of a silicon(?) fluid that was used to provide some lubrication.
The RBT-820s I got came as a batch of eight. Within the eight there were three revisions of the circuit board. The more obvious variations are detailed below:
|DT166 Serial No||Motherboard||Characteristics|
|1664XNL...||GD168_MB V:1.1||CPU mounted on top of circuit board. Small heat sink fitted, but only on half of the CPU. (Other half is covered by the SODIMM)|
|166NL...||GD168_MB V:2.1||CPU mounted on bottom of the motherboard|
|1660L...||GD168_MB V:2.4||CPU mounted on bottom of the motherboard. CR2032 button cell added to provide backup of CMOS settings.|
The case is compact in size so there is little space to fit anything internally.
Flash: The Flash memory is replaceable. It's a DOM plugged into a standard 44-pin IDE connector.
RAM: The RAM is a conventional 200-pin SODIMM plugged into a socket fitted on the top of the board. Two of my samples were fitted with 128MB of RAM, the remaining six with 256MB. They were PC2700 SODIMMs. I successfully tried out a 512MB PC2700 SODIMM I had to hand.
Wireless: The units were fitted with an internal Mini PCI b/g wireless adapter. These were VNT6655AM modules.
JLPC1: There is a 20-pin strip-line connector labelled JLPC1. I don't know what this is for and haven't attempted to see where the PC traces go.
Links: There are two sets of links on the board. JP1 sets how the unit recovers from a power failure and JP2 whether 3.3V or 5V is available on the IDE interface. There is a silk-screened explanation of the settings on the circuit board. There are small differences between the hardware revisions. The photo shows those from the V2.4 circuit board.
Any comments? email me. Added August 2017