We started producing shows as Today with a Techie on 2005-09-19, 17 years, 6 months, 6 days ago. Our shows are produced by listeners like you and can be on any topic that "are of interest to Hackers". If you listen to HPR then please consider contributing one show a year. If you record your show now it could be released in 15 days.
Tough Battery Design Worthy of the Post Apocalyptic Robotics Database
Hosted by Mechatroniac on 2023-03-20 is flagged as Explicit and released under a CC-BY-SA license. Tags:battery,18650,cells,4s.
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Series: Hobby Electronics | Comments (0)
HR000000000
H Hybrid: Denotes some prepurchased or hard to find components
R Robotics: suitable for robots
find or buy materials: duct or gorilla tape, trashed computer dvd
or cd drive, 20 18650 cells, molex connectors(you can also use barrel
jacks or whatever you want to transfer power), wire and maybe 'tab wire'
https://nl.aliexpress.com/item/32650006768.html
solder everything together as per schematic and pictures (there
is theoretically a danger in soldering cells, but I have never had a
problem. Have a pair of pliers and a nearby window handy to throw them
out of if anything goes wrong)
wrap in cardboard and tape as per pictures
add the cd/dvd drive lids(if you taped well you won't short
anything and burn your house down
tape dvd lids to battery
Getting into the battery for maintenance just requires a utility
knife.
Hear about the Uniscope 300 mainframe terminal from 1964.
Hosted by Deltaray on 2023-03-17 is flagged as Clean and released under a CC-BY-SA license. Tags:computer history,terminals.
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In the early days of computing, the computing power was kept in centralized large mainframes and users would connect to them via so called "dumb" terminals. These often provided their output through a printer and continuous feed of paper. However in 1964 UNIVAC introduced the Uniscope 300, which was one of the first terminals to provide a video monitor for display. With the introduction of this system came the introduction of several concepts that we take for granted today and they are described during the reading of this brochure.
As I mention in the episode, $15,000 USD in 1964 is worth considerably more today, according to an online inflation calculator it is now worth approximately $144,000 today. So even if that was for 48 terminals as it seems to mention in the hand written note, that might equate to about $3000 per terminal in 2023 dollars.
wikipedia:
The Drunkard's Walk: How Randomness Rules Our Lives.
wikipedia:
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uncyclopedia:
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wikipedia:
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gnu:emacs is an extensible, customizable, free/libre text
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is a worldwide distributed discussion system available on computers. It
was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up
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Google+ (pronounced and sometimes written as Google Plus; sometimes
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fda:
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healthline:
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xess:
How to install, test, and use your new XS40 or XSP Board.
ebay: SBC ISA
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snapcraft: Snaps are
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archlinux: Arch Linux is an
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gnu: GNU GRUB is a
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Bootloader, which was originally designed and implemented by Erich
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wikipedia:
Microsoft Windows is a computer operating system developed by
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wikipedia:
List of Microsoft 365 applications and services.
freedos: FreeDOS is a
complete, free, DOS-compatible operating system. While we provide some
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blackberry:
BlackBerry was a brand of smartphones and
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(Operating System/2) is a series of computer operating systems,
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pcom: The PCOM
network account is used to logon to on-campus computers and to
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IBM RT PC (RISC Technology Personal Computer) is a family of workstation
computers from IBM introduced in 1986. These were the first commercial
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Token Ring is a computer networking technology used to build local area
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rtx: The Raytheon Company is a
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In electronics, a wafer (also called a slice or substrate) is a thin
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transistor is a semiconductor device used to amplify or switch
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Usenet is a very popular platform, and Newsgroups are a crucial part of
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wikipedia:
Gemini is an application-layer internet communication protocol for
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circumlunar:
You can use the following Gemini clients to connect to this server via
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wikipedia:
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facilities of the public switched telephone network (PSTN) to establish
a connection to an Internet service provider (ISP) by dialing a
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youtube:
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fish:
newsgroup for discussion by recovering sysadmins.
thunderbird:
Thunderbird is an open source project, which means anyone can contribute
ideas, designs, code, and time helping fellow users.
wikipedia:
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BlackBerry OS, BlackBerry 10, iOS, Android, and Windows Mobile
users.
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cdc:
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morale Benefits to Employees: Reduces absences due to sickness and
doctor visits Improves health Convenience Improves morale Benefits will
vary based on investment by employers in championing vaccination and
number of employees vaccinated.
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medium-range surface-to-air missile.
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or Composition C-4 is a common variety of the plastic explosive family
known as Composition C, which uses RDX as its explosive agent.
wikipedia:
The Boeing C-97 Stratofreighter was a long-range heavy military cargo
aircraft developed from the B-29 and B-50 bombers.
wikipedia:
The Boeing B-29 Superfortress is an American four-engined
propeller-driven heavy bomber, designed by Boeing and flown primarily by
the United States during World War II and the Korean War.
truckstop:
Long-Haul Trucking: Everything You Need to Know.
bodhilinux: Bodhi Linux, a
lightweight distribution featuring the fast & fully customizable
Moksha Desktop. The 64-bit is built on top of Ubuntu (20.04).
stormos: Storm OS is a
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stormdos: a
multitasking 32-bit operating system written in Free Pascal (FPK, http://www.freepascal.org ) and
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Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition
(DSM-5), is the 2013 update to the Diagnostic and Statistical Manual of
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thyroid, or thyroid gland, is an endocrine gland in vertebrates. In
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healthline:
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of kidney disease, from diet and medication to renal replacement therapy
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Ken welcomes a new podcast to the Free Culture Podcast family
Hosted by Ken Fallon on 2023-03-15 is flagged as Explicit and released under a CC-BY-SA license. Tags:postmarketOS,Free Culture Podcast,FOSDEM.
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Series: Podcast recommendations | Comments (0)
Between the Saturday closing of FOSDEM 2023 and going to a restaurant, we
managed to squeeze around a table outside the cafeteria to record the very
first ever in-person postmarketOS podcast episode! Fresh in the moment we share
our experiences from the FOSS on mobile devroom, meeting great people at the
Linux on Mobile stand (and everywhere else at FOSDEM/in Brussels) and random
other cool things that were going down.
Featuring @spaetz (sampled in the intro), @ollieparanoid, @linmob, @craftyguy,
@MartijnBraam, @calebccff, @PureTryOut, @z3ntu (in order of appearance).
We're aware that
mesa#8198
is still causing problems for people on the PinePhone. Big thanks to @enues
from mesa who was talking to us at the stand and is now looking into it! We
also have issue
pmaports#805 about
screen freezes. If you are affected by this and would like to help out, firing
up a profiler and making/contributing to detailed, useful bugreports upstream
at mesa is appreciated.
@spaetz from Mobian did a great job at moderating the devroom! (Correction:
Ollie said from Maemo instead of Mobian in the recording.)
Hosted by Brian in Ohio on 2023-03-14 is flagged as Clean and released under a CC-BY-SA license. Tags:z80, forth, retrocomputer.
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peepaws computer does nothing
who's peepaw, whats the goal
to build and understand the inner workings of an 8 bit computer and
maybe one day pass it on to a grand kid
this episode -nop test
do a nop test, that is get the z80 up and running executing the nop
instruction
using the facilities of an arduino mega board running flash forth to
do that, talk about pictures
why? flash forth is interactive, without being such a big
application itself. Happily runs on an atmega328
why the mega, oodles and oodles of io, so emulating hardware should
be a snap
use the microcontroller board to provide 5 volts, clock signal and
data to get the z80 up and running
use the logic probe to see if there is activity on the address
bus
wiring up
hot glued solderless breadboard on to an arduino mega protoshield,
white wire is the logicprobe input
power and ground first
clock, blue
control lines int, nmi, wait busrq and reset
orange wires data bus
address lines go around the chip clockwise from the clock signal
(blue wire) we'll be probing A0, next to the ground line
1.logicprobe.jpg
2.power.jpg
3.clock.jpg
4.control.signals.jpg
5.data.jpg
6.ready.to.probe.jpg
z80-pinout.jpg
2560-pinout.jpg Click the thumbnail
to see the full-sized image
fixing some words, refactoring some words, defining new words
fixed the data processing word to us the input on pin e4 (digital 2)
not the output on pin h6 (digital 9)
changed freq= some value to simply pulse, not interested in the
specific frequency
split clock and logic probe init words
added some words to control the reset line reset and run
added a word step that allows for single clock pulses
the test, mega board plugged into laptop, seral terminal running
spool up the logic probe
spool up the microcontroller board setting up a port to provide data
on the z80 data bus (rudimentary rom)
add 5 volts
initialize and start the clock
probe the clock line
probe a0 line
a little more to see what else we can discern
single step to reset
probe m1
single step to reset
add halt instruction
probe halt line
this is output captured from the tests run on the show. lines that
begin with a back slash are comments used as narration
ok<#,ram> is the forth interpreter reporting it has
successfully processed the proceeding word(s), including comments pulse,
high and low are output from the logicprobe, all other words are defined
in the source text and the end of the notes
E FlashForth 5 ATmega2560 13.06.2022
\ initialize the logic probe ok<#,ram>
logicprobe.init ok<#,ram>
\ initialize the clock ok<#,ram>
clock.init ok<#,ram>
\ initialize arduinomega ports that interact with z80 ok<#,ram>
z80.ports.init ok<#,ram>
\ add power on the board ok<#,ram>
\ probe the clock pin to see if there is activity ok<#,ram>
sample
pulse ok<#,ram>
\ success! ok<#,ram>
\ probe adrress line A0, pin 30 on the z80 ok<#,ram>
sample
pulse ok<#,ram>
\ pulse means there is activity on the bus ok<#,ram>
\ stop the clock and probe A0 again, should see either a static high or low
signal ok<#,ram>
stop.clock sample
low ok<#,ram>
\ now move logic probe to pin 27, the M1 signal ok<#,ram>
\ put the z80 in reset and give three clock steps ok<#,ram>
reset ok<#,ram>
step ok<#,ram>
step ok<#,ram>
step ok<#,ram>
\ the z80 should be reset, now put in run ok<#,ram>
run ok<#,ram>
\ now single step the clock to see the M1 ok<#,ram>
\ signal go from high to low as the z80 begins ok<#,ram>
\ fetching data fro the data bus at address 0 ok<#,ram>
step sample
high ok<#,ram>
step sample
high ok<#,ram>
step sample
low ok<#,ram>
step sample
low ok<#,ram>
step sample
high ok<#,ram>
\ success! the M1 signal is working as expected ok<#,ram>
\ now reset the z80 and see what happens when ok<#,ram>
\ we give a different instruction this time hex 76 ok<#,ram>
\ the halt instruction. We should see the halt signal go from ok<#,ram>
\ high to low ok<#,ram>
reset step step step ok<#,ram>
\ put hat instruction on data lines ok<#,ram>
$76 DATA c! ok<#,ram>
\ now run mode ok<#,ram>
run ok<#,ram>
\ step clock and sample pin 18 the halt line ok<#,ram>
step sample
high ok<#,ram>
step sample
high ok<#,ram>
step sample
high ok<#,ram>
step sample
high ok<#,ram>
step sample
high ok<#,ram>
step sample
low ok<#,ram>
step sample
low ok<#,ram>
\ 4 clock cycles and halt line goes low and stays low, success! ok<#,ram>
\ thanks for listening ok<#,ram>
Have you ever named a pipe? If not, this is the episode you've been waiting for.
Hosted by Klaatu on 2023-03-13 is flagged as Clean and released under a CC-BY-SA license. Tags:pipe, fifo, mkfifo, Linux, shell.
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Series: Bash Scripting | Comments (0)
A named pipe is like a UNIX pipe, except it takes the form of a file.
$ mkfifo mypipe
$ echo "Hacker Public Radio" > mypipe &
$ cat mypipe
Hacker Public Radio
Hosted by Ahuka on 2023-03-10 is flagged as Clean and released under a CC-BY-SA license. Tags:Travel, RV life, Arizona, Clifton.
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Series: Travel | Comments (1)
We have left the Tucson area and moved up into the mountains to
Clifton, Arizona, a mining town. Arizona is a major source of Copper for
the U.S., and Clifton has one of the larger open pit mines in the world,
and the largest in the U.S.
Notes: Forgot to mention that I hot glued the top lid (original lid
for the 'speaker box'), on top of the boards. I had used the device with
the top uncovered for a month because I hoped I would find a better
choice but after getting tired of the wires detaching and worrying about
the sdcard slot getting wrecked I decided to commit to glueing the lid
on.
The boards are very robust, I dropped them in the snow a few times.
They would stop working but after drying off would function.
I didn't find the datasheet with the resistance values for other
values until after I glued the lid so will have to open it up again or
get into one of the switch lines and do resistor combinations... now
that I know more I think I should be able to control the mp3 player with
one analog output pin from the arduino for all the functions, since it
seems the pin 8 that all the switch resistors lead to detects voltage
levels from the voltage divider created when one of the switches goes to
ground.
The robot is using 4 lines right now for mp3 control. Would be cool
if I could free up 3 more but I don't remember if any of them are
occupying an analogue slot.
No power button! None needed. Pause and unpause via momentary switch.
The charger board can charge from micro usb or usb-c and will protect
your 18650 cell from running flat and damaging itself.
Post Apocalyptic Robotics Database Entry:
HH000000000
H Hybrid: Denotes some prepurchased or hard to find components
H Human use: For use by biological humans
Tools and supplies
multimeter - not strictly required but highly recommended
Soldering iron
solder(thinner solder wire works better for electronics)
Ken interviews Ciarán Ainsworth about Funkwhale that lets you listen and share music and audio
Hosted by Ken Fallon on 2023-03-08 is flagged as Clean and released under a CC-BY-SA license. Tags:funkwhale,Grooveshark,iTunes,vue,musicbrainz,picard,subsonic,castopod.
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Comments (1)
Funkwhale is a community-driven project that lets you listen and
share music and audio within a decentralized, open network
Brian starts the process of building an 8 bit retro computer
Hosted by Brian in Ohio on 2023-03-07 is flagged as Clean and released under a CC-BY-SA license. Tags:retro computing, forth, arduino.
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Comments (3)
intro
who is peepaw?
Me!
why a retro computer?
help a kid understand computers
the code walk through, start from the bottom up note: ( -- ) are
stack effect comments, back slashes are plain comments
constants
variable
@ ! mset mclr mtst
set up external interrupt, int4, arduino board pin4
\ the source code
\ declare some constants and variable as labels
variable Compare
variable Count
$100 constant PINH \ these labels come from the atmega2560 datasheet
$101 constant DDRH
$102 constant PORTH
$a0 constant TCCR4A
$a1 constant TCCR4B
$a8 constant OCR4A
$2c constant PINE
$2d constant DDRE
$2e constant PORTE
$6a constant EICRB
$3d constant EIMSK
: ext4.irq ( -- ) Count @ 1+ Count ! ;i \ the frequency counter
: logicprobe-init ( -- )
1249 Compare ! \ 100 hz
%0000.1000 DDRH mset \ h3 output
%0100.0000 TCCR4A c! \ toggle d6, ph3 on compare match
0000.1011 %TCCR4B c! \ set ctc mode, clk/64
Compare @ OCR4A ! \ set compare value
%0 DDRE c! \ e input
0001.0000 PORTE mset \ pullup on e4
%0000.0010 %EICRB mset \ falling edge
['] ext4.irq #6 int!
;
\ helper words
: start-clock ( -- ) %0100.0000 TCCR4A c! %0000.1011 TCCR4B c! ; \ the bit manipulation does what the word says
: stop-clock ( -- ) %0000.0000 TCCR4A c! %0000.0000 TCCR4B c! ;
: set-frequency ( n -- ) OCR4A ! ; \ set compare value
: pin-high ( -- ) %0000.1000 PORTH mset ;
: pin-low ( -- ) %0000.1000 PORTH mclr ;
: open-gate ( -- ) 0 Count ! %0001.0000 EIMSK mset ;
: close-gate ( -- ) %0001.0000 EIMSK mclr ;
: process-data ( -- )
Count @ 1- Count ! \ clean up value in Count
Count @ dup 0 > if \ is Count greater than 0, if so its pulsing
cr ." freq=" 10 * .
else \ otherwise its not so is it high or low?
drop
%0000.1000 PINH mtst
if
." high"
else
." low"
then then
;
: wait ( -- ) 100 ms ;
: sample-pin ( -- ) open-gate wait close-gate process-data ; \ the 'logic probe'
test Arduino
clock, using 16 bit timer4, its output is on pin6, running at
100hz
need to be able to start and stop the clock, and set the output pin
high or low
sample-pin is the word that does the work
ouput from the serial terminal exercising the logic probe ( comments
add after the fact):
E FlashForth 5 ATmega2560 13.06.2022
ok<#,ram>
logicprobe-init ok<#,ram> (start up the logic probe)
sample-pin (sample the pin)
freq=100 ok<#,ram> ( its oscilating at 100hz)
stop-clock ok<#,ram>
sample-pin low ok<#,ram> ( after stopping the clock the pin is low)
pin-high ok<#,ram>
sample-pin
high ok<#,ram> ( now its high)
125 set-frequency ok<#,ram>
start-clock ok<#,ram>
sample-pin
freq=1000 ok<#,ram> ( after changing the frequency its 1000hz)
next time
repurpose the 16bit clock and use it to drive the z80, we'll hook up
the data port of the z80 to the arduino mega and use the logic probe to
see if the z80 is working
Released: 2023-03-06. Duration: 01:16:32. Flag: Explicit. Series:HPR Community News. Tags:Community News.
HPR Volunteers talk about shows released and comments posted in February 2023
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Released: 2023-03-03. Duration: 00:12:16. Flag: Clean. Tags:Documents, Formats.
Document File Format - a continuation of Content Format
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Released: 2023-03-02. Duration: 01:27:04. Flag: Explicit. Series:HPR New Year Show. Tags:hpr,new years,community.
2022 - 2023 new years show where people come together and chat
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Released: 2023-03-01. Duration: 00:06:47. Flag: Explicit. Tags:chatgpt,"artificial intelligence".
The inevitable show featuring a segment written by the chatbot ChatGPT.
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Released: 2023-02-28. Duration: 01:36:49. Flag: Clean. Tags:DIY, Macbook, Macbook Pro, pc repair, repair.
Rho`n records replacing the screen to a MacBook Pro
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Released: 2023-02-27. Duration: 00:13:42. Flag: Clean. Tags:gopher,protocol,smolnet,tutorial,introduction,internet,retro.
Participating in the gopher internet protocol
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Released: 2023-02-24. Duration: 00:15:28. Flag: Clean. Series:Privacy and Security. Tags:NIST, Encryption, quantum computing.
An update on the preparations for quantum computing
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Released: 2023-02-23. Duration: 00:32:01. Flag: Clean. Tags:openbsd, ansible, router.
Recent router maintenance makes me remember all the fun I've had with my home network router
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Released: 2023-02-22. Duration: 00:12:29. Flag: Explicit. Series:Hardware upgrades. Tags:distrohopping,distros,linux,GNU,MXLinux.
Overcoming UEFI and Windows 10 to Install MXLinux 21.3 on a 2021 Asus Laptop 2nd SSD drive
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Released: 2023-02-21. Duration: 00:31:35. Flag: Clean. Tags:git,hpr,code,pull request.
rho_n shows Ken how to submit changes to the new HPR static site.
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Released: 2023-02-17. Duration: 01:23:42. Flag: Explicit. Series:HPR New Year Show. Tags:hpr,new years,community.
2022 - 2023 new years show where people come together and chat the year away
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Released: 2023-02-16. Duration: 00:08:11. Flag: Clean. Tags:retro, karaoke, 8-track, cassette tape, Free Music Archive.
I fix the cassette tape mechanism to a resale shop karaoke machine
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Released: 2023-02-15. Duration: 00:18:47. Flag: Explicit. Tags:Tin hat, chrome book, Artificial intelligence.
GOD probably will use a Chromebook.
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Released: 2023-02-14. Duration: 00:23:24. Flag: Clean. Tags:music,self-learning,auto-didactic.
In which we learn to read music by going for a walk
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Released: 2023-02-13. Duration: 00:23:38. Flag: Clean. Series:Hardware upgrades. Tags:Keyboards, Ducky, Razer, Red Dragon, Cherry, Kailh, MX, Keycaps, HyperX, Pudding.
I'm always looking for new computer hardware. This is about my keyboards
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Released: 2023-02-10. Duration: 00:12:58. Flag: Clean. Series:Travel. Tags:Travel, RV life, Arizona, Tucson.
We continue our month-long stay in Benson, a town just southeast of Tucson.
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Released: 2023-02-09. Duration: 00:53:40. Flag: Clean. Tags:common-lisp,acl2,asdf3,formal-methods,game,programming.
Describing exploratory libre common lisp portable games I am using acl2 formal methods in modules of
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Released: 2023-02-08. Duration: 00:06:37. Flag: Explicit. Tags:torch,flashlight,rechargeable,Lithium Ion.
I have owned one of these for many years and find it very useful
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Released: 2023-02-07. Duration: 00:09:44. Flag: Clean. Tags:Christmas, electrical, safety.
Rho`n describes fixing the wiring to a ceramic Christmas tree
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Released: 2023-02-06. Duration: 00:48:01. Flag: Explicit. Series:HPR Community News. Tags:Community News.
HPR Volunteers talk about shows released and comments posted in January 2023
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Released: 2023-02-02. Duration: 00:18:27. Flag: Clean. Series:Privacy and Security. Tags:2FA, OTP, TOTP, HOTP, security.
Diving into privacy-aware and offline methods to generate one time passwords
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Released: 2023-02-01. Duration: 00:21:44. Flag: Explicit. Tags:Accessibility, HPR, Screen Reader.
Mike puts the HPR Web Site to the test.
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Released: 2023-01-31. Duration: 00:05:00. Flag: Clean. Tags:media, formats, encoding.
Wikipedia article on the various types of content formats
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Released: 2023-01-30. Duration: 00:13:11. Flag: Clean. Tags:electronics.
Using the Joule Thief to suck energy out of flat batteries
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Released: 2023-01-27. Duration: 00:13:44. Flag: Clean. Series:Social Media. Tags:social media, alternative, Fediverse, ActivityPub, Mastodon, Screen readers, WordPress.
This episode reports on some updates to the Fediverse that I ran across in May 2022
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Released: 2023-01-26. Duration: 00:03:18. Flag: Clean. Tags:aging, diy, health.
Just because you can do a thing, does that mean you should?
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Released: 2023-01-25. Duration: 00:20:23. Flag: Explicit. Tags:Android, chromebooks, easytether, cellphones, bandwidth,beeing,sucks, QRcodes, healio.
I made a 'beeing" podcast about Google products, interoperability and their lousy security
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Released: 2023-01-24. Duration: 00:08:51. Flag: Clean. Tags:freebsd,haiku,beos,bhyve,vmbhyve,bsd,virtualization,hypervisor.
Claudio talks about installing and running Haiku R1/beta4 on Bhyve
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Released: 2023-01-23. Duration: 00:09:32. Flag: Clean. Tags:xero linux, distro review, linux distro, .
A linux distro review
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Released: 2023-01-20. Duration: 00:14:10. Flag: Clean. Tags:home-made computer, glue, fun, kids.
How to make a punch-card computer from stuff from the kitchen
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Released: 2023-01-19. Duration: 00:25:00. Flag: Explicit. Tags:Racing, Chump Car World Series, MonsterB, Portland Oregon, sounds, boring.
The racing series for $500 cars.
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Released: 2023-01-18. Duration: 00:17:35. Flag: Explicit. Tags:public speaking,.
Some tips on public speaking for technical talks or lectures.
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Released: 2023-01-17. Duration: 00:27:43. Flag: Clean. Tags:solar,electricity,power,electronics.
I have a look at a cheap solar panel and learn a bit about how it works, and doesn't work.
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Released: 2023-01-16. Duration: 00:19:46. Flag: Clean. Tags:elliptical,ergonomics,pain,natural,Microsoft,Logitech,Elecom.
I describe how I managed to eliminate pain from carpal tunnel syndrome and osteoarthritis.
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Released: 2023-01-13. Duration: 00:15:08. Flag: Clean. Series:Travel. Tags:Travel, RV life, Arizona.
We move to Benson, a town just southeast of Tucson, where we will stay for a month.
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Released: 2023-01-10. Duration: 00:42:41. Flag: Explicit. Tags:audio, vinyl, record, media, history.
LP article from Wikipedia about the long playing vinyl record and its history.
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