DIY Soldering

Broadcom Wireless cards and Lenovo E530 Bios UEFI Whitelist

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24Aug2015
Last Updated on 24 August 2015 | Written by CodeAsm

Wireless card

Its a trouble maker, a soldering iron fire starter. The Lenovo E530 I got two(already!)years ago can sometimes be a pain.
First I destroyed the filesystem, then I borked the Bootsequence and last time I beeped flipped the Bios/Uefi variables completly.

I save those boot errors for another blog, when I try refashing it.
Wich actualy started my research for COreboot or just removing/altering the Whitelist of my beloved Lenovo.

Wait what? if you never heard of Bios whitelists, or whitelists for hardware, go read here:

So yes, My lenovo has a whitelist and I do not agree.

Click the readmore button to view some awesome images of the card without shield cover and my further research:

 

Read more: Broadcom Wireless cards and Lenovo E530 Bios UEFI Whitelist

 

openWRT on the Sitecom WL-559 / WL-173 54g Turbo ?

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09Jan2014
Last Updated on 09 January 2014 | Written by CodeAsm

Doing some reseach on getting openWRT working on the Sitecome WL-559 from Ziggo (I found mine while dumster diving ;) ) and doing so i can confirm, the WL-559 is just a relabeled WL-173 Sitecom just for Ziggo (NL (BE? FR?))

This is based and hopefully helps the openWRT pages : http://wiki.openwrt.org/oldwiki/openwrtdocs/hardware/sitecom/wl_173?s[]=wl&s[]=173

This router runs on the Realtek RTL8650/RTL8651(B): http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=11&Level=4&Conn=3&ProdID=70

Router

I found so far:

  • Serial com (TTL Rx Tx)
  • Posible JTAG (some people already found out, and got memory access)
  • USB 1.0 !! its not populated but datasheets and other family members of the RTL8650B has USB !
  • Sources availeble
  • Telnet ?

And some guy who build some of them? https://web.archive.org/web/20130606111447/http://www.csie.nctu.edu.tw/~cfliu/work/8650.htm

Please click readmore for all the research ive done sofar and ill update this article when im finding more.

 

Read more: openWRT on the Sitecom WL-559 / WL-173 54g Turbo ?

 

Vcc, Vdd, Vss or Vdd. What are they and wich one is ground and power?

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30Dec2013
Last Updated on 30 December 2013 | Written by CodeAsm

Ive heard it earlier from a electrician and a teacher, but I seem to keep forgetting it. So to start remorizing it I started to write this article. Its actualy pretty easy when you remember why it is called VDD or VCC for power and VSS and VEE for ground.

Because of the Transistors inside the IC your connecting it to. ill qoute: "Apparently this terminology originated in some way from the terminals of each type of transistor, and their common connections in logic circuits (i.e., Vcc is often applied to BJT collectors, Vee to BJT emitters, Vdd to FET drains, and Vss to FET sources). This notation then carries across to integrated circuits" Eric Seale and Wilf Rigter.

Its source: http://encyclobeamia.solarbotics.net/articles/vxx.html

and the table from  there:

BJT FET "Vxx" meaning
Vcc Vdd Positive supply voltage
Vee Vss Negative supply, ground
   

Summer projects and MSX

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12Aug2013
Last Updated on 12 August 2013 | Written by CodeAsm

Recently I recieved a pakage from Japan containing the following ic:

Yamaha V9958

V9958

This is ofcourse a Video chip belonging to the 80s MSX series. Awesome looking 64pin DIP.

I did another search on the internet and yes, I realy like to build a MSX from scratch or at least a MSX upgrade card to turn my MSX to a Msx2 or even a MSX2+.

A qoute from Wiki:

The Yamaha V9958 is a Video Display Processor (VDP) used in MSX 80s home computers. More specifically, the MSX 2+, MSX turbo R and the "TIM" upgrade to the TI-99/4A. The Yamaha V9958, also known as MSX-Video, is the successor of the Yamaha V9938. It was clearly conceived not to be a very major upgrade to its predecessor, which hampered its adoption. The main new features are three graphical YJK modes (with up to 19268 colors) and horizontal scrolling registers.

 

I now want to buy the following:

YM2413 (maybe more, to play with) DIP14
YM2149 aka AY-3-8920 (DIP64, so i want to use it in a socket)
Some RAM chips for Video, CPU

And of course make a PCB for this all.
I also know that I have difficulties keeping my projects simple, ill start writing a add-on Card for my existing MSX, try making some game.
And maybe start making an upgrade card in such a way that an home-brew MSX can also use it. Magic everywhere. Also I realy need to go understand Glue logic.

Hope I don't break stuff :D
and I rly have no idea, maybe I should do something with my N8vem aswell, to get "into" stuff.

Remember this? its my N8vem, it still running so now and then. I should make some more cards for it :P

 

 

 

Iiyama Pro Lite E485S FIX

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28Jan2013
Last Updated on 28 January 2013 | Written by CodeAsm

It was a busy weekend, and I did not have lots of time for everytyhing I wanted to do.

But I was pretty pleased with the fact that I could find some time and all the tools needed to fix my Iiyama E485S LCD screen.

This was the problem, like more people I had this screen laying arround wich gave a Greenish screen when turn on and that isnt going away.

Only if you say to a Debug/Service menu to use "special" values it is maybe in the correct colors again. But once power lost, so is the green screen back.

Read more: Iiyama Pro Lite E485S FIX

   

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