OptiPlex 755 Hacking

October 4, 2011, 9:51 pm

I had a old Optiplex 755 knocking around and I wanted to stick a PCIe graphics card in it. Unfortunately the 755 is a small form factor PC and the PCIe card, while electrically compatible, doesn’t fit.

I removed the section around the PCI bay, this allowed the front of the PCIe card to stick out of the system. Unfortunately the heat sink also encroaches on the footprint of a double width PCIe card. So it had to go. The casing around the heatsink and keeps it firmly coupled to the motherboard was removed. Amazingly with the heatsink JUST SITTING on the processor enough heat still seems to get dissipated, well… time will tell, but so far there are no signs of overheating.

I also had to replace the powersupply, there was no way the dinky little thing in there was going to power a double width GPU.

Fin

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Palm Pre Rooting and Terminal Installation

October 3, 2011, 10:15 pm

You can find detailed rooting information for the Palm Pre here. These are some quick notes on how to root the Pre on a Mac, and some additional software you might want to install after the phone is rooted.

0. Check device information, in order to run Preware later you need firmware version 1.4.0 or above.

1. To enable developer mode:

In Card view or in the Launcher application, type the following: webos20090606
(follow the on screen instructions)

2. Install the Palm SDK from here (Mac)

3. On your PC run novaterm from the command prompt.

4. You have a root shell yay!

5. Install “Preware”. (detailed instructions here).

In your root shell, type the following:

cd /tmp
wget http://gitorious.org/webos-internals/bootstrap/blobs/raw/master/preware-bootstrap.sh
sh /tmp/preware-bootstrap.sh

(answer yes to everything)

6. In your apps window you’ll have a new app called “Preware” open it. Let it do its thing.

7. In Preware install Terminal and or Terminus (This are in Application/System)

Yay root!

Notes

The Palm Pre uses BusyBox and glibc, yay:

From /lib/libc-2.5.so:

@GNU C Library stable release version 2.5, by Roland McGrath et al.
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Compiled by GNU CC version 4.2.1.
Compiled on a Linux >>2.6.20-16-generic<< org="" software="" libc="" html="">.

and it has busybox complete file listing here: filelist

Output of df:

root@palm-webos-device:/# df -h
Filesystem                Size      Used Available Use% Mounted on
rootfs                  441.7M    413.4M     28.3M  94% /
/dev/root                31.0M     11.3M     19.7M  36% /boot
/dev/mapper/store-root
                        441.7M    413.4M     28.3M  94% /
/dev/mapper/store-root
                        441.7M    413.4M     28.3M  94% /dev/.static/dev
tmpfs                     2.0M    156.0k      1.8M   8% /dev
/dev/mapper/store-var
                        248.0M     22.7M    225.3M   9% /var
/dev/mapper/store-log
                         38.7M      6.0M     32.7M  16% /var/log
tmpfs                    64.0M      2.4M     61.6M   4% /tmp
tmpfs                    16.0M     44.0k     16.0M   0% /var/run
tmpfs                   119.5M         0    119.5M   0% /media/ram
/dev/mapper/store-media
                          6.7G     21.2M      6.7G   0% /media/internal
cryptofs                  6.7G     21.2M      6.7G   0% /media/cryptofs
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Program for calculating E

October 3, 2011, 2:54 pm

A program for calculating E in C++, in a stupid way no doubt.

#include
#include

using namespace std;

int main() {

double sum=0;
for(double x=1;x<10;x=x+0.000000001) { double y = 1/x; sum += 0.000000001*y; if(sum >= 1) {
cout << "E: " << setprecision(15) << x << endl; return 0; } } } [/sourcecode] Another method: [sourcecode language="cpp"] #include
#include

using namespace std;

int main() {

double e=1;
for(double n=0;n<=1;n=n+0.000000001) { e=e+(e*0.000000001); } cout << "E: " << setprecision(15) << e << endl; } [/sourcecode]

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Grabbing environment variables in gnuplot

October 2, 2011, 11:59 pm

set environment variables from bash e.g:

export positionsfile="$outputfile".positions
export rankprogressfile="$outputfile"

Then use them from gnuplot e.g.:

set size 1,1
set ylabel "Count"
set xlabel "Positions"

set terminal postscript eps color
set output "`echo $positionsfile`.eps"

plot "`echo $positionsfile`" using 1:2 with lines
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