NetBSD ASCII logos

Since I’ve been more and more interested about NetBSD lately, I decided to draw some ASCII logos to be used as MOTD and/or as /etc/issue. So here are the two variants I came up with, rendered with Amiga Topaz font.

Feel free to use them on your systems, and change the NetBSD port in the information boxes accordingly. I currently use mainly NetBSD/evbarm, so the logos reflect that.

The files can be downloaded here and here. Enjoy.

NetBSD ASCII Logo - One-line variant

NetBSD ASCII Logo - Box variant

Cross building NetBSD on Linux

Known for its portability, it might come at no surprise that NetBSD (and pkgsrc as well) is also easy to cross build on other platforms and even other hosts. Building NetBSD on Linux can be very conveniant, as it’s far easier to get access to high-performance Linux powered machines than to NetBSD ones. So let’s go through the process and build a NetBSD/amd64 release on a Debian host, using an unprivileged user account.

First, we will need to install some development packages on the host machine :

apt-get install build-essential zlib1g-dev flex

Then, we can download and extract source sets for the NetBSD version we want to build. At the time of writing, latest NetBSD release is 6.1.4 :


for file in *.tgz
	tar xfz $file

We can now build the cross compiler :

cd usr/src
./ -U -u -m amd64 tools

Compilation results :

===> Summary of results: command:    ./ -U -u -m amd64 tools started:    Thu Aug 28 21:49:19 UTC 2014
	 NetBSD version:      6.1.4
	 MACHINE:             amd64
	 MACHINE_ARCH:        x86_64
	 Build platform:      Linux 3.2.0-4-amd64 x86_64
	 HOST_SH:             /bin/sh
	 No $TOOLDIR/bin/nbmake, needs building.
	 Bootstrapping nbmake
	 TOOLDIR path:        /home/admin/usr/src/obj/tooldir.Linux-3.2.0-4-amd64-x86_64
	 DESTDIR path:        /home/admin/usr/src/obj/destdir.amd64
	 RELEASEDIR path:     /home/admin/usr/src/obj/releasedir
	 Created /home/admin/usr/src/obj/tooldir.Linux-3.2.0-4-amd64-x86_64/bin/nbmake
	 Updated makewrapper: /home/admin/usr/src/obj/tooldir.Linux-3.2.0-4-amd64-x86_64/bin/nbmake-amd64
	 Tools built to /home/admin/usr/src/obj/tooldir.Linux-3.2.0-4-amd64-x86_64 ended:      Thu Aug 28 21:56:48 UTC 2014

Here is more information about configuration options used in those examples :

-U             Set MKUNPRIVED=yes; build without requiring root privileges,
               install from an UNPRIVED build with proper file permissions.
-u             Set MKUPDATE=yes; do not run "make cleandir" first.
               Without this, everything is rebuilt, including the tools.
-m mach        Set MACHINE to mach; not required if NetBSD native.

Once our toolchain is ready, we can now build NetBSD itself :

./ -U -u -m amd64 release

Compilation results :

===> Summary of results: command:    ./ -U -u -m amd64 release started:    Thu Aug 28 21:57:54 UTC 2014
         NetBSD version:      6.1.4
         MACHINE:             amd64
         MACHINE_ARCH:        x86_64
         Build platform:      Linux 3.2.0-4-amd64 x86_64
         HOST_SH:             /bin/sh
         TOOLDIR path:        /home/admin/usr/src/obj/tooldir.Linux-3.2.0-4-amd64-x86_64
         DESTDIR path:        /home/admin/usr/src/obj/destdir.amd64
         RELEASEDIR path:     /home/admin/usr/src/obj/releasedir
         Updated makewrapper: /home/admin/usr/src/obj/tooldir.Linux-3.2.0-4-amd64-x86_64/bin/nbmake-amd64
         Successful make release ended:      Thu Aug 28 23:21:28 UTC 2014

From there, building an ISO image takes only a few seconds :

./ -U -u -m amd64 iso-image

We can now try to boot the resulting ISO image :

NetBSD Primary Bootstrap
NetBSD Installer

Unsurprisingly, it works as expected! Welcome to NetBSD :-)

Installing CA certificates on NetBSD

Using SSL-aware programs which expect a CA certificate path on NetBSD (such as cURL, Git or Wget) without installing CA certificates will result in the following SSL certificate error messages.

Please note that this also happens when using pkgsrc on other systems, and the same installation instructions can be used.

cURL error message :

curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here:

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

Git error message :

git clone
Cloning into 'pkgsrc'...
fatal: unable to access '': SSL certificate problem: unable to get local issuer certificate

Wget error message :

--2014-08-25 16:48:11--
Resolving (, 2001:4f8:3:7:14::25
Connecting to (||:443... connected.
ERROR: cannot verify's certificate, issued by ‘/C=US/O=GeoTrust, Inc./CN=RapidSSL CA’:
  Self-signed certificate encountered.
To connect to insecurely, use `--no-check-certificate'.

In order to fix this issue, we need to install CA certificates distributed by the Mozilla Project (mozilla-rootcerts package), using either pkgsrc or pkgin :

Using pkgsrc :

cd /usr/pkgsrc/security/mozilla-rootcerts
make install clean clean-depends

Using pkgin :

pkgin install mozilla-rootcerts

We can then extract and rehash all CA root certificates :

mozilla-rootcerts install

The combined certificate file will be created in /etc/ssl/certs, and we can now connect safely to secure endpoints.

Nginx on FreeBSD

The purprose of this article is mostly to show how easy it is to compile and run custom builds of Nginx on FreeBSD, including third party modules which will be automatically fetched and built.

For a comprehensive list of compile time options and included modules for Debian and Ubuntu packages, check the following article : Nginx packages in Debian stable.

Installing Nginx via pkg :

pkg install nginx

By default, Nginx is compiled with the following options :

nginx version: nginx/1.6.0
TLS SNI support enabled
configure arguments:
--with-cc-opt='-I /usr/local/include'
--with-ld-opt='-L /usr/local/lib'

Installing Nginx using the ports collection :

cd /usr/ports/www/nginx
make config

Below is a list of all available configuration options and third party modules, showing the Lua module highlighted and selected for compilation.

Nginx on FreeBSD

Once configured, we can launch installation and clean dependencies :

make install clean-depends

Starting Nginx :

After adding the nginx_enable directive in rc.conf :

echo 'nginx_enable="YES"' >> /etc/rc.conf

We can launch the server manually :

service nginx start

Nginx is now up and running and should be launched automatically at boot time.

Emulators written in JavaScript

A list of emulators written in the JavaScript programming language.

This list started as a compilation of JavaScript emulators posted to Echo JS over the years. If you know about any missing emulators, please consider adding them to the collection : the source for this page is available on GitHub. Thank you in advance.

Lastly, if you are into JavaScript, you might enjoy Echo JS.


  • CPCBox - Amstrad CPC emulator in JavaScript
  • Roland - An Amstrad CPC emulator written in JavaScript


  • Apple IIjs - An Apple ][ Emulator in JavaScript
  • a2 - A fast, WebGL optimized Apple ][+ emulator.
  • Apple2JS - A JavaScript emulator for the Apple II


  • EstyJS - A pretty fast and functional JavaScript Atari ST emulator (Source)
  • jsA8E - JavaScript version of the A8E Atari 800 XL Emulator




  • 1964js - JavaScript port of the 1964 N64 emulator for Windows
  • CycloaJS - JavaScript NES Emulator (Source)
  • GBA.js - Game Boy Advance in the Browser
  • GameBoy Online - JavaScript GameBoy Color emulator (Source)
  • IodineGBA - A GameBoy Advance emulator written entirely in JavaScript (Source)
  • JS-VBA-M - JavaScript port of VisualBoyAdvance-M, a Game Boy Color / Advance emulator
  • JSNES - A JavaScript NES emulator (Source)
  • Nezulator - A NES emulator in JavaScript
  • XNES - Experimental JavaScript Super Nintendo emulators (Source)
  • fam - JavaScript NES emulator (Source)
  • jsGB - A GameBoy emulator in JavaScript (Source)
  • mupen64plus - A port of the popular Nintendo 64 emulator for the Web (Source)
  • n64js - An N64 emulator in JavaScript (Source)

PC Emulators

  • JS/Linux - JavaScript PC emulator
  • JsDOSBox - JavaScript PC DOS emulator (Source)
  • PCjs - IBM PC Model 5150 emulator
  • Virtual x86 - An x86 emulator written in JavaScript (Source)
  • jemul8 - An object-oriented JavaScript x86 emulator for Node.js and the Browser (Source)
  • jsbochs - Bochs PC emulator for the Browser (Source)




Multi-system Emulators

  • JSMESS - The JavaScript MESS (Multi Emulator Super System) (Source)
  • PCE - PC emulators in JavaScript (Atari ST, IBM PC 5150, Macintosh, RC759 Piccoline)
  • RetroArch - JavaScript port of RetroArch (bundles Gambatte (Gameboy), Genesis Plus GX, Handy (Lynx), Snes9x Next, VBA Next (GameBoy Advance), Tyrquake and FinalBurn Alpha)