A different way to share the memory bus between the CPU and the Video

Considering the ZX Spectrum, part of the memory is accessible to both the ULA and the CPU, and the CPU is slowed down when it is using that area, so that the framebuffer can be read out. As I understand, some Amigas also have a region of memory which slows the CPU down when the CPU reads/writes to it, because it is connected not only to the CPU, but also to the video/sound/etc.

But it’s occurred to me, that the vast majority of interaction with the framebuffer on these systems will be to write something. Only rarely will it be necessary to read from the framebuffer. So it seems to me, that whenever the ZX Spectrum wrote a byte to the 8 KB containing the display file, instead of slowing the CPU down to allow that to happen, the value and the address could have been latched, and the write to the memory could happen later on — say, when the Z80 is fetching the next instruction. It should be possible so long as the video memory is on a separate bus from the rest of memory. (Of course, it would require a little extra circuitry, and would possibly preclude being able to execute code from this region, but it’s probably worth doing, right?).

So what’s with this design decision? The ZX Spectrum, the Amiga, the Commodore 64, all slow the CPU down so that the video can be read! Did any retrocomputing system buffer the write so as to let the CPU run at full speed whenever it’s not reading from the framebuffer (which is practically always)?

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How to share a clipboard between PC and windows phone 8.1

I need to sync and share data real-time between this two devices.

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Who made the cartoon where the ping pong champion got beat by a kid, and can you share an image?

I saw this cartoon a couple decades ago and I believe it was from The Far Side but I am not certain.

It showed a cowboy-style theme where the champion ping pong player (a king of the mountain) was finally beat by a skilled kid.

The caption was something like this:

Well kid, you beat me. Now every paddle-packing player wanting to make a name
for himself will come lookin’ for you instead.

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Can you use fed interest rates to predict the share price of a bond ETF?

The Fed interest rate is inversely proportional to a bond’s value:

  • When the Fed increases interest rates, your bonds lose value.
  • When the Fed decreases interest rates, your bonds gain value.

Since interest rates were rock bottom last year, they have nowhere to go but up. The Fed also announced that there would be several increases in rates to come. Does this mean we should wait until the Fed stops increasing rates to buy shares of bond ETF’s at a bargain rate?

Take the example below. SPTL is a long term treasury ETF. It has been moving in the opposite direction as the federal funds rate. It’s not just SPTL, but also most aggregate bond funds and municipal bond funds have been declining in value.

When people say “you can’t time the market”, does that only apply to stocks? Because I see clear indications of how bond funds can move.

Federal Funds Rate

fed interest rate

Bond ETF

enter image description here

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Can you use fed interest rates to predict the share price of a bond ETF?

The Fed interest rate is inversely proportional to a bond’s value:

  • When the Fed increases interest rates, your bonds lose value.
  • When the Fed decreases interest rates, your bonds gain value.

Since interest rates were rock bottom last year, they have nowhere to go but up. The Fed also announced that there would be several increases in rates to come. Does this mean we should wait until the Fed stops increasing rates to buy shares of bond ETF’s at a bargain rate?

Take the example below. SPTL is a long term treasury ETF. It has been moving in the opposite direction as the federal funds rate. It’s not just SPTL, but also most aggregate bond funds and municipal bond funds have been declining in value.

When people say “you can’t time the market”, does that only apply to stocks? Because I see clear indications of how bond funds can move.

Federal Funds Rate

fed interest rate

Bond ETF

enter image description here

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How to share a clipboard between PC and windows phone 8.1

I need to sync and share data real-time between this two devices.

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Generate LetsEncrypt Certs to NFS share

Im trying to generate a letsencrypt wildcard cert to use on various websites (one FQDN, multiple subdomains). The plan is to save those certs on a NFS share I have to easily access them on various webservers.

But when I mount my NFS share to /etc/letsencrypt so it saves the certs to there, I get an error:

letsencrypt | IOError: [Errno 37] No locks available

I set the mode of the folder on the share to 777, so it should have write access.

My docker-compose.yml file:

version: '3.5'
services:
  letsencrypt:
    image: linuxserver/letsencrypt
    restart: unless-stopped
    network_mode: host
    cap_add:
      - NET_ADMIN
    environment:
    - OTHERSTUFF=blahblah
    - STAGING=true
    volumes:
    - ./config/letsencrypt:/config/dns-conf
    - Certs:/config/etc/letsencrypt

volumes:
  Certs:
    name: certs
    driver: local
    driver_opts:
      type: nfs
      o: addr=10.0.1.14,rw
      device: ":/media/NAS/Certs"

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How to share apache /var/www using samba server in ubuntu

My issue is similar to the stackoverflow question, virtual centOS 6.2 – How to share /var/www using Samba, however I am getting the following error:

Windows cannot access server1dev You do not have permission to access \server1dev

I installed ubuntu server and I am trying to give the /var/www/html/dev directory read and write permissions from other computers (ex: windows 7 and ubuntu desktop).

I changed the owner of folder /var/www to the www-data group and added user dev1 to that group. I then gave 0755 permission to the folder /var/www And below are the contents of my smb.conf file:

[global]
workgroup = WORKGROUP
server string = Samba Server %v
netbios name = ubuntu
security = user
map to guest = bad user
dns proxy = no

#============================ Share Definitions ============================== 
[sharing]
path = /samba/share
browsable =yes
writable = yes
guest ok = yes
read only = no
force user = nobody

[dev]
path = /var/www/html/dev
valid users = @www-data
read only = no
guest ok = no
writable = yes
browsable = yes

So I am tried to access the dev share using a password. I have also added a samba user by following this tutorial, but when I attempt to access this share from windows 7 machine, I receive the following error message:

Windows cannot access server1dev.  You do not have permission to access \server1dev  

Additional information

I can access /samba/share but cannot access the dev share.

EDIT: Now the windwos system asking to enter password. But after entering password I get the error \s1dev is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.

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Connect to samba share from windows 10

I am having difficulties to connect to a samba share from Windows10. The samba-share is located on a Ubuntu server 16.04.
I did some reading on the internet and did configure the share but can’t connect from windows10.

Hopefully someone can help me I’m a bit desperate right now…

Accessing the server from windows file explorer gives the following feedback:

cannot access

diagnostics misspelled

diagnostics server exists

On forehand I did the following within the Ubuntu server:

Configuring /etc/samba/smb.conf:

#
# Sample configuration file for the Samba suite for Debian GNU/Linux.
#
#
# This is the main Samba configuration file. You should read the
# smb.conf(5) manual page in order to understand the options listed
# here. Samba has a huge number of configurable options most of which
# are not shown in this example
#
# Some options that are often worth tuning have been included as
# commented-out examples in this file.
#  - When such options are commented with ";", the proposed setting
#    differs from the default Samba behaviour
#  - When commented with "#", the proposed setting is the default
#    behaviour of Samba but the option is considered important
#    enough to be mentioned here
#
# NOTE: Whenever you modify this file you should run the command
# "testparm" to check that you have not made any basic syntactic
# errors.

#======================= Global Settings =======================

[global]

## Browsing/Identification ###

# Change this to the workgroup/NT-domain name your Samba server will part of
   workgroup = RVNET

# server string is the equivalent of the NT Description field
        server string = %h server (Samba, Ubuntu)

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable its WINS Server
#   wins support = no

# WINS Server - Tells the NMBD components of Samba to be a WINS Client
# Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
;   wins server = w.x.y.z

# This will prevent nmbd to search for NetBIOS names through DNS.
   dns proxy = no

#### Networking ####
#
# Sample configuration file for the Samba suite for Debian GNU/Linux.
#
#
# This is the main Samba configuration file. You should read the
# smb.conf(5) manual page in order to understand the options listed
# here. Samba has a huge number of configurable options most of which
# are not shown in this example
#
# Some options that are often worth tuning have been included as
# commented-out examples in this file.
#  - When such options are commented with ";", the proposed setting
#    differs from the default Samba behaviour
#  - When commented with "#", the proposed setting is the default
#    behaviour of Samba but the option is considered important
#    enough to be mentioned here
#
# NOTE: Whenever you modify this file you should run the command
# "testparm" to check that you have not made any basic syntactic
# errors.

#======================= Global Settings =======================

[global]

## Browsing/Identification ###

# Change this to the workgroup/NT-domain name your Samba server will part of
   workgroup = RVNET

# server string is the equivalent of the NT Description field
        server string = %h server (Samba, Ubuntu)

# Windows Internet Name Serving Support Section:
# WINS Support - Tells the NMBD component of Samba to enable its WINS Server
#   wins support = no

# WINS Server - Tells the NMBD components of Samba to be a WINS Client
# Note: Samba can be either a WINS Server, or a WINS Client, but NOT both
;   wins server = w.x.y.z
# This will prevent nmbd to search for NetBIOS names through DNS.
   dns proxy = no

#### Networking ####

# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
;   interfaces = 127.0.0.0/8 eth0

# Only bind to the named interfaces and/or networks; you must use the
# 'interfaces' option above to use this.
# It is recommended that you enable this feature if your Samba machine is
# not protected by a firewall or is a firewall itself.  However, this
# option cannot handle dynamic or non-broadcast interfaces correctly.
;   bind interfaces only = yes



#### Debugging/Accounting ####

# This tells Samba to use a separate log file for each machine
# that connects
   log file = /var/log/samba/log.%m

# Cap the size of the individual log files (in KiB).
   max log size = 1000

# If you want Samba to only log through syslog then set the following
# parameter to 'yes'.
#   syslog only = no

# We want Samba to log a minimum amount of information to syslog. Everything
# should go to /var/log/samba/log.{smbd,nmbd} instead. If you want to log
# through syslog you should set the following parameter to something higher.
   syslog = 0

# Do something sensible when Samba crashes: mail the admin a backtrace
   panic action = /usr/share/samba/panic-action %d


####### Authentication #######
security = user

# Server role. Defines in which mode Samba will operate. Possible
# values are "standalone server", "member server", "classic primary
# domain controller", "classic backup domain controller", "active
# This will prevent nmbd to search for NetBIOS names through DNS.
   dns proxy = no

#### Networking ####

# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
;   interfaces = 127.0.0.0/8 eth0

# Only bind to the named interfaces and/or networks; you must use the
# 'interfaces' option above to use this.
# It is recommended that you enable this feature if your Samba machine is
# not protected by a firewall or is a firewall itself.  However, this
# option cannot handle dynamic or non-broadcast interfaces correctly.
;   bind interfaces only = yes



#### Debugging/Accounting ####

# This tells Samba to use a separate log file for each machine
# that connects
   log file = /var/log/samba/log.%m

# Cap the size of the individual log files (in KiB).
   max log size = 1000

# If you want Samba to only log through syslog then set the following
  dns proxy = no

#### Networking ####

# The specific set of interfaces / networks to bind to
# This can be either the interface name or an IP address/netmask;
# interface names are normally preferred
;   interfaces = 127.0.0.0/8 eth0

# Only bind to the named interfaces and/or networks; you must use the
# 'interfaces' option above to use this.
# It is recommended that you enable this feature if your Samba machine is
# not protected by a firewall or is a firewall itself.  However, this
# option cannot handle dynamic or non-broadcast interfaces correctly.
;   bind interfaces only = yes



#### Debugging/Accounting ####

# This tells Samba to use a separate log file for each machine
# that connects
   log file = /var/log/samba/log.%m

# Cap the size of the individual log files (in KiB).
   max log size = 1000

# If you want Samba to only log through syslog then set the following
# parameter to 'yes'.
#   syslog only = no

# We want Samba to log a minimum amount of information to syslog. Everything
# should go to /var/log/samba/log.{smbd,nmbd} instead. If you want to log
# through syslog you should set the following parameter to something higher.
   syslog = 0

# Do something sensible when Samba crashes: mail the admin a backtrace
   panic action = /usr/share/samba/panic-action %d


####### Authentication #######
security = user

# Server role. Defines in which mode Samba will operate. Possible
# values are "standalone server", "member server", "classic primary
# domain controller", "classic backup domain controller", "active
# directory domain controller".
#
# Most people will want "standalone sever" or "member server".
# Running as "active directory domain controller" will require first
# running "samba-tool domain provision" to wipe databases and create a
# new domain.
   server role = standalone server

# If you are using encrypted passwords, Samba will need to know what
# password database type you are using.
   passdb backend = tdbsam

# We want Samba to log a minimum amount of information to syslog. Everything
# should go to /var/log/samba/log.{smbd,nmbd} instead. If you want to log
# through syslog you should set the following parameter to something higher.
   syslog = 0

# Do something sensible when Samba crashes: mail the admin a backtrace
   panic action = /usr/share/samba/panic-action %d


####### Authentication #######
security = user

# Server role. Defines in which mode Samba will operate. Possible
# values are "standalone server", "member server", "classic primary
# domain controller", "classic backup domain controller", "active
# directory domain controller".
#
# Most people will want "standalone sever" or "member server".
# Running as "active directory domain controller" will require first
# running "samba-tool domain provision" to wipe databases and create a
# new domain.
   server role = standalone server

# If you are using encrypted passwords, Samba will need to know what
# password database type you are using.
   passdb backend = tdbsam

   obey pam restrictions = yes

# This boolean parameter controls whether Samba attempts to sync the Unix
# password with the SMB password when the encrypted SMB password in the
# passdb is changed.
   unix password sync = yes

# For Unix password sync to work on a Debian GNU/Linux system, the following
# parameters must be set (thanks to Ian Kahan < for
# sending the correct chat script for the passwd program in Debian Sarge).
   passwd program = /usr/bin/passwd %u
   passwd chat = *Entersnews*spassword:* %nn *Retypesnews*spassword:* %nn *passwordsupdatedssuccessfully* .

# This boolean controls whether PAM will be used for password changes
# when requested by an SMB client instead of the program listed in
# 'passwd program'. The default is 'no'.
   pam password change = yes

# This option controls how unsuccessful authentication attempts are mapped
# to anonymous connections
   map to guest = bad user

########## Domains ###########

#
# The following settings only takes effect if 'server role = primary
# classic domain controller', 'server role = backup domain controller'
# or 'domain logons' is set
#

# It specifies the location of the user's
# profile directory from the client point of view) The following
# required a [profiles] share to be setup on the samba server (see
# below)
;   logon path = \%Nprofiles%U
# Another common choice is storing the profile in the user's home directory
# (this is Samba's default)
#   logon path = \%N%Uprofile

# The following setting only takes effect if 'domain logons' is set
# It specifies the location of a user's home directory (from the client
# point of view)
;   logon drive = H:
#   logon home = \%N%U

# The following setting only takes effect if 'domain logons' is set
# It specifies the script to run during logon. The script must be stored
# in the [netlogon] share
# NOTE: Must be store in 'DOS' file format convention
;   logon script = logon.cmd

# This allows Unix users to be created on the domain controller via the SAMR
# RPC pipe.  The example command creates a user account with a disabled Unix
# password; please adapt to your needs
; add user script = /usr/sbin/adduser --quiet --disabled-password --gecos "" %u

# This allows machine accounts to be created on the domain controller via the
# SAMR RPC pipe.
# The following assumes a "machines" group exists on the system
 add machine script  = /usr/sbin/useradd -g machines -c "%u machine account" -d /var/lib/samba -s /bin/false %u

# This allows Unix groups to be created on the domain controller via the SAMR
# RPC pipe.
; add group script = /usr/sbin/addgroup --force-badname %g

############ Misc ############

# Using the following line enables you to customise your configuration
# on a per machine basis. The %m gets replaced with the netbios name
# of the machine that is connecting
;   include = /home/samba/etc/smb.conf.%m

# Some defaults for winbind (make sure you're not using the ranges
# for something else.)
;   idmap uid = 10000-20000
;   idmap gid = 10000-20000
;   template shell = /bin/bash

# Setup usershare options to enable non-root users to share folders
# with the net usershare command.

# Maximum number of usershare. 0 (default) means that usershare is disabled.
;   usershare max shares = 100

# Allow users who've been granted usershare privileges to create
# public shares, not just authenticated ones
   usershare allow guests = yes
#======================= Share Definitions =======================

# Un-comment the following (and tweak the other settings below to suit)
# to enable the default home directory shares. This will share each
# user's home directory as \serverusername
;[homes]
;   comment = Home Directories
;   browseable = no

# By default, the home directories are exported read-only. Change the
# next parameter to 'no' if you want to be able to write to them.
;   read only = yes

# File creation mask is set to 0700 for security reasons. If you want to
# create files with group=rw permissions, set next parameter to 0775.
;   create mask = 0700

# Directory creation mask is set to 0700 for security reasons. If you want to
# create dirs. with group=rw permissions, set next parameter to 0775.
;   directory mask = 0700

# By default, \serverusername shares can be connected to by anyone
# with access to the samba server.
# Un-comment the following parameter to make sure that only "username"
# can connect to \serverusername
# This might need tweaking when using external authentication schemes
;   valid users = %S

# Un-comment the following and create the netlogon directory for Domain Logons
# (you need to configure Samba to act as a domain controller too.)
;[netlogon]
;   comment = Network Logon Service
;   path = /home/samba/netlogon
;   guest ok = yes
;   read only = yes

# Un-comment the following and create the profiles directory to store
# users profiles (see the "logon path" option above)
# (you need to configure Samba to act as a domain controller too.)
# The path below should be writable by all users so that their
# profile directory may be created the first time they log on
;[profiles]
   comment = Users profiles
   path = /mnt/raid5/data16
;   guest ok = no
   browseable = yes
   valid users = rick
;   create mask = 0600
;   directory mask = 0700
   available = yes
   public = yes
   read only = no
   writable = yes

[printers]
   comment = All Printers
   browseable = yes
   path = /var/spool/samba
   printable = yes
   guest ok = yes
   read only = yes
   create mask = 0700

# Windows clients look for this share name as a source of downloadable
# printer drivers
[print$]
   comment = Printer Drivers
   path = /var/lib/samba/printers
   browseable = yes
   read only = yes
   guest ok = no
# Uncomment to allow remote administration of Windows print drivers.
# You may need to replace 'lpadmin' with the name of the group your
# admin users are members of.
# Please note that you also need to set appropriate Unix permissions
# to the drivers directory for these users to have write rights in it
;   write list = root, @lpadmin

I did use the following commands to add a group on the data16 directory.
User rick has access to the directory and I checked he can access that directory from within the Ubuntu server. I created some test-directories there.
I used the following commandline commands:

rick@RVSERVER16:/mnt/raid5$ sudo groupadd data16
rick@RVSERVER16:/mnt/raid5$ sudo usermod -a -G data16 rick
rick@RVSERVER16:/mnt/raid5$ sudo mkdir data16
rick@RVSERVER16:/mnt/raid5$ sudo chgrp -R data16 /mnt/raid5/data16
rick@RVSERVER16:/mnt/raid5$ sudo chmod -R 777 /mnt/raid5/data16
rick@RVSERVER16:/mnt/raid5$ sudo chmod g+s /mnt/raid5/data16
rick@RVSERVER16:/mnt/raid5$ sudo smbpasswd -a rick
Added user rick.
rick@RVSERVER16:/mnt/raid5$ sudo restart smbd
rick@RVSERVER16:/mnt/raid5$ sudo restart nmdb
rick@RVSERVER16:/mnt/raid5$ sudo /etc/init.d/samba restart

Finally a view on the directory info:

rick@RVSERVER16:/mnt/raid5$ ls -all
total 60
drwxr-xr-x 15 root root   4096 Jan 18 20:24 .
drwxr-xr-x  3 root root   4096 Jan 18 19:46 ..
drwxr-xr-x  2 root root   4096 Apr 12  2016 backups
drwxr-xr-x  9 root root   4096 Jan  7 15:55 cache
drwxrwxrwt  2 root root   4096 Jan  7 15:56 crash
drwxrwsrwx  5 root data16 4096 Jan 28 14:07 data16
drwxr-xr-x 48 root root   4096 Jan  7 16:00 lib
drwxrwsr-x  2 root staff  4096 Apr 12  2016 local
lrwxrwxrwx  1 root root      9 Jan  7 15:50 lock -> /run/lock
drwxrwxr-x 11 root syslog 4096 Jan  7 16:01 log
drwxrwsr-x  2 root mail   4096 Aug  1 13:16 mail
drwxr-xr-x  2 root root   4096 Aug  1 13:16 opt
lrwxrwxrwx  1 root root      4 Jan  7 15:50 run -> /run
drwxr-xr-x  2 root root   4096 Apr 29  2017 snap
drwxr-xr-x  5 root root   4096 Jan  7 15:55 spool
drwxrwxrwt  2 root root   4096 Jan  7 16:00 tmp
drwxr-xr-x  3 root root   4096 Jan  7 15:55 www

Information asked by N0rbert:
rick@RVSERVER16:/mnt/raid5/data16$ smbclient -L localhost
WARNING: The “syslog” option is deprecated
Enter rick’s password:
Domain=[RVNET] OS=[Windows 6.1] Server=[Samba 4.3.11-Ubuntu]

    Sharename       Type      Comment
    ---------       ----      -------
    profiles        Disk      Users profiles
    print$          Disk      Printer Drivers
    IPC$            IPC       IPC Service (RVSERVER16 server (Samba, Ubuntu))

Domain=[RVNET] OS=[Windows 6.1] Server=[Samba 4.3.11-Ubuntu]

    Server               Comment
    ---------            -------
    RVSERVER16           RVSERVER16 server (Samba, Ubuntu)
    RVZOLDER             RV_ZOLDER

    Workgroup            Master
    ---------            -------
    RVNET                RVSERVER16

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Question: Does anyone know POS system market share in EU and Asia?

Question: Does anyone know POS system market share in EU and Asia?

Question: Does anyone know POS system market share in EU and Asia?

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