Displays We Love Hacking: DSI

June 12, 2024 by Arya Voronova 10 Comments

We would not be surprised if DSI screens made up the majority of screens on our planet at this moment in time. If you own a smartphone, there’s a 99.9% chance its screen is DSI. Tablets are likely to use DSI too, unless it’s eDP instead, and a smartwatch of yours definitely will. In a way, DSI displays are inescapable.

This is for a good reason. The DSI interface is a mainstay in SoCs and mobile CPUs worth their salt, it allows for higher speeds and thus higher resolutions than SPI ever could achieve, comparably few pins, an ability to send commands to the display’s controller unlike LVDS or eDP, and staying low power while doing all of it.

There’s money and power in hacking on DSI – an ability to equip your devices with screens that can’t be reused otherwise, building cooler and cooler stuff, tapping into sources of cheap phone displays. What’s more, it’s a comparably underexplored field, too. Let’s waste no time, then!

Decently Similar Internals

DSI is an interface defined by the MIPI Alliance, a group whose standards are not entirely open. Still, nothing is truly new under the sun, and DSI shares a lot of concepts with interfaces we’re used to. For a start, if you remember DisplayPort internals, there are similarities. When it comes to data lanes, DSI can have one, two or four lanes of a high-speed data stream; smaller displays can subsist with a single-lane, while very high resolution displays will want all four. This is where the similarities end. There’s no AUX to talk to the display controller, though – instead, the data lanes switch between two modes.

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Baldur’s Gate III Comes To The TRS-80 Model 100

June 12, 2024 by Tom Nardi 8 Comments

To say that Tandy’s TRS-80 Model 100 was an influential piece of computer hardware would be something of an understatement. While there’s some debate over which computer can historically be called the “first laptop”, the Model 100 was early enough that it helped influence our modern idea of portable computing. It was also one of the most successful of these early portables, due in part to how easy it was to write your own software for it using the built-in BASIC interpreter.

But as handy and capable as that integrated development environment might have been, it never produced anything as impressive as this Baldur’s Gate III “demake” created by [Alex Bowen]. Written in assembly, the game’s engine implements a subset of the Dungeons & Dragons Systems Reference Document (SRD), and is flexible enough that you could use it to produce your own ASCII art role-playing game that can run on either a Model 100 emulator like Virtual-T or on the real hardware.

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Remixed Pi Recovery Kit V2 Offers Another Path

June 12, 2024 by Tom Nardi 3 Comments

Just a few months after releasing the long-awaited second version of his Raspberry Pi Recovery Kit, [Jay Doscher] is back with an alternate take on his latest Pi-in-a-Pelican design. This slightly abridged take on the earlier design should prove to be easier and cheaper to assemble for those playing along at home while keeping the compromises to a minimum.

Probably the biggest change is that the Raspberry Pi 5 has been swapped out for its less expensive and more abundant predecessor. The Pi 4 still packs plenty of punch, but since it requires less power and doesn’t get as hot, it’s less temperamental in a build like this. Gone is the active cooling required by the more powerful single-board computer, and the wiring to distribute power to the Kit’s internal components has been simplified. The high-end military style connectors have been deleted as well. They looked cool, but they certainly weren’t cheap.

One of the most striking features of the original Recovery Kit was the front-mounted switches — both the networking type that’s intended to help facilitate connecting the Raspberry Pi to whatever hardware is left after the end of the world, and the toggles used to selectively control power to to accessory devices. Both have returned for the Recovery Kit 2B, but they’re also optional, with blank plates available to fill in their vacant spots.

Ultimately, both builds are fairly similar, but there’s enough changes between the two that it will have a notable impact on how much time (and money…) it would take you create one of your own. [Jay] has attempted to offer less intimidating versions of his designs in the past; while other creators take a “one and done” approach to their projects, he seems eager to go back and rethink problems that most others would have considered solved.