03 April, 2022

Teletype / TTY

A teleprinter (teletypewriter, teletype or TTY) is an electromechanical device that can be used to send and receive typed messages through various communications channels, in both point-to-point and point-to-multipoint configurations.


Initially they were used in telegraphy, which developed in the late 1830s and 1840s as the first use of electrical engineering, though teleprinters were not used for telegraphy until 1887 at the earliest.

The machines were adapted to provide a user interface to early mainframe computers and minicomputers, sending typed data to the computer and printing the response. Some models could also be used to create punched tape for data storage (either from typed input or from data received from a remote source) and to read back such tape for local printing or transmission.

One such (deprecated in these days (2022)) computer-based teletype device, was the portable Minitel.


The Minitel was a videotex online service accessible through telephone lines, and was the world's most successful online service prior to the World Wide Web. It was invented in Cesson-Sévigné, near Rennes in Brittany, France.

The service was rolled out experimentally on 15 July 1980 in Saint-Malo, France, and from autumn 1980 in other areas, and introduced commercially throughout France in 1982 by the PTT (Postes, Télégraphes et Téléphones; divided since 1991 between France Télécom and La Poste).

From its early days, users could make online purchases, make train reservations, check stock prices, search the telephone directory, have a mail box, and chat in a similar way to what is now made possible by the World Wide Web (Internet).

In February 2009, France Télécom indicated the Minitel network still had 10 million monthly connections. France Télécom retired the service on 30 June 2012.

The service was purely PSTN-based (aka public switched telephone network / "plain old telephone system") and required a subscription land-line.

Recently I came over a Norwegian model on a Norwegian auction-site (finn.no), which would be the ideal complement to my next hobby-project: a PDP11/70 Unix mini-replica minicomputer. So I bought it.


This is the Alcatel Terminus 258. A Minitel-clone made for the Norwegian telecom authority at the time (Televerket, branded on the keyboard-latch in the image above).


Mine is the Unitel-version, meaning; it is not catered for the Minitel-service, but as a control terminal using either a PSTN or a serial (DIN connector) uplink.



14 January, 2022

Pinecil - open-sauce solder pen


Finally got a decent (and easily portable) soldering pen, the Pinecil!

"The Pinecil is a smart mini portable soldering iron with a 32-bit RISC-V SoC featuring a sleek design, auto standby and it heats up to an operating temperature in just 12 seconds!"

Paired with a proper A/C adapter that can supply (at least) 3A @ 9V, you'll be able to do some serious mid-tier soldering with the right soldering tips.


Specs:

Dual power input design: 1) USB-C supports both PD and QC 3.0 and; 2) DC5525 barrel DC jack.

Speedy Rapid Warmup: Reaches operating temperature in 12 seconds. Support for on-demand rapid boost feature.

Adjustable soldering tip temperature which can be set between 100° C and 400° C using the adjustment buttons and an easy-to-read OLED display.

Portable: it features a sleek and slim design, comprised of an SAE 304 stainless steel core housed inside a polycarbonate shell.

Auto standby mode engages when it is not in use ensuring the user safety.

30 December, 2021

MAME / arcade-stick 🕹️ part 2


Time for some Q/A...


...and some game testing :P



27 December, 2021

MAME / arcade-stick 🕹️ part 1


Assembled the acrylic top + buttons + plastic bottom.


Attached joy-stick assembly to top.


Getting ready to wire up everything control-wise.

Wired up and attached to zero-delay USB controller-board.

01 August, 2021

Amiga OS 3.2 installation 💾

 


Kickstart ROM v1.3 removed...


Modified Kickstart ROM v3.2 to be installed...


Kickstart ROM v3.2 installed in motherboard...



Kickstart 3.2 + Workbench 3.2 version info


Apparently v3.1 coded applications work on v3.2 👌😎