Sagacious Himself — brevity in circumlocution: never blague — suffering genius

July 21, 2014

realtek RTL8192CU

Filed under: Download,Geeky goodness,Hardwares,Raspberry Pi — Sagacious Himself @ 4:27 pm

For low cost client compatibility with Atheros AP we opted for RealTek RTL8192CU.

  • IEEE 802.11b/g/n WLAN Controller with USB 2.0 Interface
  • a MAC, a 2T2R capable baseband, and RF in a single chip
  • as Realtek RTL8192CU-GR
  • ProductID 277

Working backwards from selected chipset we selected a manufacturer least likely to abandon driver development:  TP-Link, TrendNet.  This left less desirable: Belkin, BenQ, D-Link, Edimax, Hawking, Netgear, Rosewill, and the balance from the listed 48.

linux: lsusb


OSX: system_profiler SPUSBDataType

Product ID: 0x8178
Vendor ID: 0x0bda  (Realtek Semiconductor Corp.)
Version:  2.00
Serial Number: 00e04cXXXXXX
Speed: Up to 480 Mb/sec
Manufacturer: 802.11n
Location ID: 0xfa200000 / 3
Current Available (mA): 500
Current Required (mA): 500


as TP-LINK TL-WN823N   (available only as V1 in support site)

2T2R [mimo 2×2:2]

The MAC address of the tested units seems to be cloned.  Fun.

One flavor of RTL8191SU-GR [ProductID 231] is available as 2X2:2 also in 27 products.


That RTL8192CU vs that RTL8191SU

  • RTL8192CU additionally:  receiver diversity up to two antennas
  • RTL8192CU additionally:  two independent RF blocks, the RTL8192CU can perform fast roaming without link interruption
  • RTL8192CU only:  64-pin QFN
  • RTL8192CU only: IEEE 802.11h TPC, Spectrum Measurement
  • RTL8192CU only: IEEE 802.11k Radio Resource Measurement
  • _peripheral  (it’s not worth fighting wordpress outline ‘features’)
  • CU: general purpose IO pins: 10
  • SU: general purpose IO pins: 8
  • CU: configurable LED pins: 3
  • SU: configurable LED pins: 2


Unique to SU standards

  • Cisco Compatible Extensions (CCX4)


Amidst other features both share

  • Multiple BSSID feature allows … multiple MAC identities when used as a wireless bridge



RTL8192CU RealTek drivers, version 2.0.1

current to 2012 october



uninstall script for OS X includes


echo “Uninstalling Script and Utility …”
sudo killall -c Wireless\ Network\ Utility
sleep 2
sudo rm -rf /Library/StartupItems/WirelessNetworkUtility

echo “Uninstalling UI…”
sudo rm -rf /Library/LaunchAgents/Wlan.Software.plist
sudo rm -rf /Applications/Wireless\ Network\

echo “Removing Driver…”
sudo kextunload /System/Library/Extensions/RTL8192SU8.kext
sudo rm -rf /System/Library/Extensions/RTL8192SU8.kext
sudo kextunload /System/Library/Extensions/RTL8192CU8.kext
sudo rm -rf /System/Library/Extensions/RTL8192CU8.kext

As one packages serves two flavors

    <choice id=”choice7″ title=”RTL8192CU”>
<pkg-ref id=”com.WirelessDriverCU.pkg”/>
<choice id=”choice8″ title=”RTL8192SU”>
<pkg-ref id=”com.WirelessDriverSU.pkg”/>

And some startup joy

<string>/Applications/Wireless Network Network Utility</string>


TP-Link “V1” driver





February 5, 2013

RPi fraught USB reader, SDcards

Filed under: Raspberry Pi,SDHC — Sagacious Himself @ 7:01 pm
Tags: ,

Alcor Micro

$6 iogear GFR209A, corded 12 in 1 USB reader, ASIN:B004QHPYT0

Some ubuntu boxes see- and use it, others pretend it has become existentially challenged.

USB3 devices in USB2 consistently appear to function at USB2 max which makes sense given lazy corporations and foolhardy management which is why to buy USB3 flash USB (UFD)


__Fun with SDcards

$14 transcend TS8GSDHC10U1E, 8gig class10 UHS1, claim 85/22 MB/sASIN:B006LFVJW6 [1]

$14 “sandisk” SDSDX-008G-X46, 8gig Class10 UHS1, claim 30/30 MB/sASIN:B007M54DYA [2]

Raspberry Pi initially didn’t care for the Transcend 8gig ‘fast’ (a brand ordinary I would avoid) Class 10 UHS-1 TS8GSDHC10U1E  claims 85/22 MB/s.  ‘Seems’ about as fast as the sandisk 8gig equivalent.

When I didn’t bother with a partition table or partitioning (for one partition) and formatted partitionless Raspberry Pi tolerated (recognized) its existence.  Having OpenElec and DarkElec sporadically freeze was a bit tiresome especially Vizio cold booting so transcend provides an Xbian alternative (no such freezes yet).  With more patience I’ll try creative NFS openelec. (yes, all shares are NFS, no media SMB here)

The Transcend 2 gig TS2GSDC I bought for an OOOLLD camera I haven’t tried feeding RPi.  $4.99 ASIN:B000FGNM6I

no RPi issues gut feeling clone.  Had a ‘great’ time with amazon CS trying to find the correct ASIN for the retail part: their FFP/retail selector would only add ‘FF’P to the cart.  Sandisk says they don’t package for amazon which means a lunkhead opens the static sensitive bits to repackage (or a robot with lazy maintenance/programmer).  I routinely receive non-electronics pick-robot packaged like fine china but delicate electronics with nothing more than a packing slip inside a skin tight box.   fabulous!  I can return until they do it right.. how much double-shipping loss is amazon willing to absorb before ‘someone’ steps in to correct glaring errors?  I miss the foldable sandisk combo USB plugs.  The 512meg version I have is only suited for BerryBoot

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