Atari 1050 Test Point Voltages

Screen Shot 2018-09-30 at 13.28.44

Test Point Voltage
TP13 +5
TP14 +12
TP15 Ground

My J14,J10, J1,J12… had a different color scheme than the service manual, so I included a picture here.


Port Knocking (Raspberry Pi)

What is it?

Port knocking works by configuring a service to watch an interfaces for connection attempts. If a specific sequence of predefined connection attempts (or “knocks”) are made, the service will modify the firewall rules and open up connections on a specific port.

This is useful for services meant to be used only by known, legitimate users, like SSH.

Server Setup on Pi

Insure you have a firewall installed (UFW = Uncomplicated Firewall)

sudo apt install ufw
sudo ufw enable

and deny SSH

sudo ufw deny 22

sudo apt-get update
sudo apt-get install knockd
sudo nano /etc/default/knockd
# control if we start knockd at init or not
# 1 = start
# anything else = don't start

# command line options
KNOCKD_OPTS="-i wlan0"
sudo nano /etc/knockd.conf

        sequence    = 7000,8000,9000
        seq_timeout = 5
        command     = /sbin/iptables -I INPUT -s %IP% -p tcp --dport 22 -j ACCEPT
        tcpflags    = syn

        sequence    = 9000,8000,7000
        seq_timeout = 5
        command     = /sbin/iptables -I INPUT -s %IP% -p tcp --dport 22 -j ACCEPT
        tcpflags    = syn

For Seeing the output while testing

sudo service knockd stop
sudo knockd -D -v

To see if the rule was applied, from another console

sudo iptables-save

For normal operation

The raspberry Pi *should* auto start the knockd service at startup, however, I found it didn’t and needed to add these steps:

sudo nano /lib/systemd/system/knockd.service

Edit the file as follows:

Description=Port-Knock Daemon

ExecStart=/usr/sbin/knockd $KNOCKD_OPTS
ExecReload=/bin/kill -HUP $MAINPID
SuccessExitStatus=0 2 15
CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN


Tell it to start knockd at startup:

systemctl enable knockd.service

Finally start the service

sudo service knockd start

Client Applications (The Knocker)

OS Application
OSX KnockIt!
Android Port Knocker

SuperPET with 6809 emulation using VICE

I learned how to program originally on a SuperPET using Waterloo APL, now you can torture yourself as well:
xpet +sound -truedrive -superpet -cpu6809
-model SuperPET -drive8type 8050 -drive9type 8050 -drive10type 8050 -drive11type 8050
-8 DISKS\os9-systemdisk.d80
-9 DISKS\sp9000lang.d80
-10 DISKS\sp9000tut.d80
Important Tip: You *must* have the OS9 disk in drive 8.
Additional Docs: