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IBM 5161 Expansion Chassis Extender and Receiver Cards

Today is an exciting day for people who collect vintage IBM PCs and XTs! IBM had a somewhat obscure add-on product called the 5161 expansion chassis, which looked exactly like an IBM PC but with a difference case badge. It allowed customers to add two additional full-height drives (typically 10MB MFM hard drives) and 7 usable expansion slots (excluding the one used for the MFM disk controller). And yes, with those full-height hard drives, it sounded like a jet engine.

Connecting the expansion chassis to the host PC were two expansion cards. One, the extender, was placed in the host PC....

TubeTime
Posted at 2018-09-06 00:11:41 | Electronics | read on

Free Stuff, June and July 2018

junio 2018

El destinario de Cosas Gratis para junio es Gabriel Martín Miguel de Salamanca, España. Él quiere hacer una plataforma de radio asequible a los nuevos radioaficionados para acercarles las nuevas formas de hacer radio. Él tiene un grupo de Facebook sobre SDR para usuarios, programadores y radioficionados en español, tanto en España como en latinoamerica, aqui: facebook.com/groups

July 2018

CTRL-H Hackerspace of Portland, Oregon asked us for a HackRF One. They plan to use it for SDR workshops and their Electronics Lab Radio Closet, where they'll be capturing and hosting as much data as possible through SDR. It looks like they...

Great Scott Gadgets
Posted at 2018-08-29 13:14:00 | Electronics | read on

Still alive, just not blogging

It's been months without any update to this blog, and I feel sad about that. Nothing particular has happened to me, everything is proceeding as usual.

At the Osmocom project we've been making great progress on a variety of fronts, including

3GPP LCLS (Local Call, Local Switch)

Inter-BSC hand-over in osmo-bsc

load Based hand-over in osmo-bsc

reintroducing SCCPlite compatibility to the new BSC code in osmo-bsc / libosmo-sigtran

finishing the first release of the SIMtrace2 firmware

extending test coverage on all fronts, particularly in our TTCN-3 test suites

tons of fixes to the osmo-bts measurement processing / reporting

higher precision time of arrival reporting in osmo-bts

migrating osmocom.org services to new,...

LaForge's home page
Posted at 2018-08-26 16:00:00 | Electronics | read on

Free Stuff, May 2018

We sent Oleksandr Tytko a HackRF One. He is studying at Lyceum No 1, Chernivtsi, Ukraine. He and his classmates plan to use the HackRF One to learn about SDR and to write and test their own code. He is also very enthusiastic about starting an open source project studying the influence of radio frequencies on plants and people. He sent us a picture of the greenhouse in his local Botanic Garden where he plans to do the research:

Dan Groeneveld is an instructor at Northland Pioneer College in Show Low, Arizona. He is going to be teaching net security and...

Great Scott Gadgets
Posted at 2018-08-21 11:48:00 | Electronics | read on

Free Stuff, April 2018

April's Free Stuff recipient is EFF (The Electronic Frontier Foundation). EFF is a nonprofit organization that defends civil liberties in the digital world. From their website: Founded in 1990, EFF champions user privacy, free expression, and innovation through impact litigation, policy analysis, grassroots activism, and technology development. We work to ensure that rights and freedoms are enhanced and protected as our use of technology grows.

Andrés Arrieta, Technology Projects Manager, has asked for a HackRF One because: At EFF we are looking how technologies impact our rights in our daily lives. Research has already shown many vulnerabilities in the standards...

Great Scott Gadgets
Posted at 2018-08-21 09:25:00 | Electronics | read on

Free Stuff, March 2018

The Free Stuff recipient for March is Jan van Katwijk, a hobby programmer from the Netherlands. He plans to use his new HackRF One to finish his work on DAB software by providing a library for HackRF, then for experimenting with wideband receiving issues. His current developments include software support for ACARS and ADS-B decoding.sdfsdfdsf A full overview of his work is available here and here.

If you'd like to submit your project idea for consideration to receive free hardware from Great Scott Gadgets, please visit the Free Stuff page and send us a message!

Great Scott Gadgets
Posted at 2018-08-20 16:14:00 | Electronics | read on

www.apertus.org: AXIOM Team Talk Volume 14.1 - Moving Facilities, Updates and GSoC Projects

https://invidious.privacyredirect.com/watch?v=z4KE4gE_jB0


Moving Offices For the last two years the AXIOM headquarters has cohabited from the modest Amescon facilities in the 15th District of Vienna, Austria. This is where most of the electronics manufacturing for the AXIOM Betas has taken place. This spring we began the process of moving to a new, bigger and better shared office called Factory Hub Vienna - this was quite a challenge as the pick and place machine was built and assembled inside the old office and so it wasn’t clear whether or not the machine would fit through the doors… it didn’t. In the first Team Talk...

apertus°
Posted at 2018-07-09 14:03:10 | Electronics | read on

Re-launching openmoko USB Product ID and Ethernet OUI registry

Some time after Openmoko went out of business, they made available their USB Vendor IDs and IEEE OUI (Ethernet MAC address prefix) available to Open Source Hardware / FOSS projects.

After maintaining that for some years myself, I was unable to find time to continue the work and I had handed it over some time ago to two volunteers. However, as things go, those volunteers also stopped to respond to PID / OUI requests, and we're now launching the third attempt of continuing this service.

As the openmoko.org wiki will soon be moved into an archive of static web pages only, we're also moving the list of...

LaForge's home page
Posted at 2018-06-08 16:00:00 | Electronics | read on

Калькулятор скорости UART для AVR

Калькулятор скорости UART для AVR-микроконтроллеров. По умолчанию отображаются таблицы для основных популярных частот процессора и скоростей обмена. При желании эти параметры можно изменить.

Значения в таблицах подсвечены разными цветами в зависимости от отклонения реальной частоты передачи от желаемой: менее 0.1%, менее 0.5%, менее 1%, менее 2%, менее 3%, более 3%.

Bit Rate:

Clock Freq, MHz:

fCPU = 1 MHzBit RateU2Xn = 0U2Xn = 1UBRR
(dec)UBRR
(hex)Actual
Bit RateErrorUBRR
(dec)UBRR
(hex)Actual
Bit RateError3002070x00CF300.480.2%4160x01A0299.76-0.1%6001030x0067600.960.2%2070x00CF600.960.2%900680x0044905.80.6%1380x008A899.28-0.1%1200510x00331201.920.2%1030x00671201.920.2%1800340x00221785.71-0.8%680x00441811.590.6%2400250x00192403.850.2%510x00332403.850.2%3600160x00103676.472.1%340x00223571.43-0.8%4800120x000C4807.690.2%250x00194807.690.2%960060x00068928.57-7%120x000C9615.380.2%14.4 K30x000315.625 K8.5%80x000813.889 K-3.5%19.2 K20x000220.833 K8.5%60x000617.857 K-7%28.8 K10x000131.25 K8.5%30x000331.25 K8.5%33.6 K10x000131.25 K-7%30x000331.25 K-7%38.4 K10x000131.25...

TrolSoft
Posted at 2018-06-04 19:00:24 | Electronics | read on

A Vacuum Tube ROM?

Is such a thing possible?

Turns out it is, and it’s called a Monoscope. I recently got a Raytheon CK1414 Monoscope with a good getter and a working filament–naturally, I decided to fire it up.

The Monoscope is essentially a CRT; it has an electron gun and deflection plates which create a thin electron beam and points it towards the screen. Unlike a CRT, there is no phosphorescent coating on the end of the glass envelope. Instead, there is a metal plate that has an alphanumeric character set printed on it (an 8×8 array for 64 possible characters). There is also a...

TubeTime
Posted at 2018-06-04 00:37:14 | Electronics | read on
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***

Однажды китайский ученый Ли Хунь Янь обнаружил некоторую незначительную, однако, существенно отличающуюся от фона корреляцию между количеством псилоцибина потребляемого корфуцианскими медузами и характером передвижения оных по стенкам четырехсотлитровго шарообразного аквариума, установленного в лаборатории по случаю празднования сто второго полугодичного затмения от начала новой эры Сингулярного Прорыва. Недолго думая, Ли Хунь Янь приделал к щупальцам медуз источники излучения в видимом диапазоне но с разной длинной волны, заснял весь процесс шестью камерами с 48 часовой выдержкой, симметрично расставив последние вокруг сосуда, где резвились подопытные и через неделю собрал прелюбопытнейший материал, который, в свою очередь, лег в основу фундаментального труда, ныне известного, как теория полутретичных n-многообразий простой метрики Ли Хунь Янь, с которой (с некоторыми упрощениями и оговорками) я, по мере сил, постараюсь познакомить любопытного и пытливого читателя.

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