Maybe Scrolly?

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7 Aug, 5 tweets, 2 min read

recognize this texture?

zooming out slightly

slightly more zoomed out

it's an Indy! SGI sure knew how to make cool computer cases.

purple!

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More from @TubeTimeUS

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8 Aug

today I got to talk to Bill Mensch, one of the designers of the iconic 6502 microprocessor, and show him the Monster 6502. he's holding a blank Monster 6502 circuit board I gave him.

we had a lot to talk about, as you might imagine!

one of the things we discussed was the design process of the 6502. a critical part of the planning was a flowchart that showed how every instruction was executed. everything else was derived from this.

Tube Time

@TubeTimeUS

8 Aug

I have a problem.

I need to write a video BIOS for the Graphics Gremlin in order to support Tandy and PCjr video modes.

so what's the problem? I don't know x86 assembly language.

so I figured I'd stop by the FOPAL (friends of the Palo Alto library) bookstore here at VCF. maybe find a book on assembly programming for the PC.

Tube Time

@TubeTimeUS

7 Aug

here's an IBM System 34. it's a midrange computer but we're just using it to play games these days

this is the floppy drive, which is a bit special

let's pull out this cartridge

Tube Time

@TubeTimeUS

7 Aug

have you seen *this* keyboard before? probably not. but let's zoom out first...

ooh this is interesting

it's... built into a desk! but the "display" is a tractor feed printer!

Tube Time

@TubeTimeUS

7 Aug

this may look like an ordinary computer mouse, but it has a secret...

if you remove the palm rest, it reveals the top of the mouse ball. 🤔

and there's a switch on the bottom. let's set it to "T"

Tube Time

@TubeTimeUS

6 Aug

i've been thinking about how to blow up power MOSFETs. it turns out that there are several interesting ways to make a MOSFET fail... 🧵

but where to start? why not the MOSFET datasheet? (follow along here vishay.com/docs/91018/sih… if you like)

one easy way to blow up a MOSFET is to exceed the absolute maximum ratings. they really are absolute!

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