JWZ documents his adventures in bringing a 1982/3 vintage Ann Arbor Ambassador 60 terminal (a rare portrait-orientation terminal) back into service -- fitting it with a Raspberry Pi and a new power-supply and getting it to boot its beautiful green-screen.
I don't remember how I ended up with it -- I probably liberated it from work some time in the late 80s. But it served me well.
At one point, I built a 50' serial cable so that I could drag the terminal out onto the back deck and work outside. I remember also routing audio for a headphone jack over some of the unused lines inside that cable, since I didn't have speakers outside.
An elegant cable, from a simpler age.
Here's the problem with this device, as you can see in the video: the character buffer on the serial port is not large. I'm guessing it is dozens of bytes deep. Dozens. And the CPU that moves those bytes from the serial port into display memory is... not fast. So it keeps up pretty well at 4800 baud, but at 9600, or when you light up the afterburners and go for the full 19,200, it falls behind.
The way terminals deal with this is flow control: either end can say, "Hold up, I am suffering" and data transmission stops until the other side is ready. The proper way to do this over a serial connection is with DSR/DTR lines, which are extra copper on the RS-232 cable, one for each side, that signal when we're ready to go. But as noted, the not-quite-a-serial-port that Pis have doesn't have that. Which leaves you with inline flow control, XON and XOFF, typically the ASCII bytes ^S to stop and ^Q to resume.
You guys, I got my Ono-Sendai working again!
My 2019 book Radicalized has been named one of the five finalists for Canada Reads, the CBC's annual book prize -- Canada's leading national book award, alongside of the Governor General's award!
In 1975, Pol Pot and the Khmer Rouge seized power in Cambodia after expelling a US puppet regime, surviving a brutal US bombing campaign despite the massive asymmetry between the Cambodian forces and the US military. Tian Veasna was born three days after the Khmer Rouge took power, and spent his formative years in forced labor camps as his family were beaten, starved, tortured and murdered. Today, Veasna is a comics creator living in France, and in Year of the Rabbit, Veasna creates a coherent story out of his family's narratives, giving us a ground-level view of the horrors of the Pol Pot regime, whose campaign of genocide led to the deaths of more than a million people.
Chicago's Volante (previously) bills itself as "streetwear for superheroes," and I love their clothes. They've just released an addition to their existing canon of Star Trek-themed, cosplay-adjacent clothes: the Picard Sweater, a stretchy knit tribute to Jean-Luc himself, the perfect thing to wear while you're watching Wil Wheaton host "The Ready Room," which airs after […]
More and more people are flocking to a wide variety of careers in IT, thanks mostly to the high pay, plentiful advancement opportunities, and an exciting atmosphere that offers new challenges every day. The only problem is that this high demand means competition can be fierce if you’re entering the job market for the first […]
Going to the beach is almost always an enjoyable experience, but trekking back through your house on the way to the shower can leave a trail of sand the quickly saps the day of its sunny fun. Thankfully this BeachBox: Portable Shower & Storage unit has you covered the next time you hit the beach. […]
When it comes to immediately grabbing a reader’s attention in any medium, few things are more important than picking the perfect font—regardless of whether you’re advertising your brand online or in print. The MyFonts Monotype Fresh Font Bundle offers over 50 handcrafted fonts from one of the world’s most revered typeface companies, and it’s available […]