techav

techav Apple Computers at VCF Southwest 2025Apple computers from the earliest Apple ][ through late PowerMac G5 towers were well represented throughout the show floor. There were however a few exhibits...

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techav Lights & Switches at VCF Southwest 2025 Front panel computers were well represented at VCFSW this year. There was this mini S-100 system featuring the [Don Caprio] IMSAI front panel replica and a...

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techav Usagi Electric, Forgotten Machines, & Nevets at VCF Southwest 2025 [Usagi Electric], [Forgotten Machines], and [Nevets01] collaborated on a massive exhibit of unique old hardware. [Usagi Electric] had...

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techav Commodore Computers at VCFSW 2025ALTALTALTALTALTALTALTALTALT

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techav REDog at VCFSW 2025REDog is a prototype accessibility aid that can take a picture of a document and read aloud the text on that document. It has been on display outside the UT Dallas Media Archeology....

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#VCFSW

techav ALTWrap030 at VCFSW 2025ALTFor VCF Southwest this year, I brought Wrap030, my 68030 homebrew computer running Multibasic, my minimal multi-user operating system. I paired it with three glass...

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VCF Southwest 2025 is officially open!

I am set up at the front of the main exhibit hall with my Wrap030 homebrew computer project.

techav ALTVCF Southwest 2025Starts tomorrow! Home | Vintage Computer Festival Southwest Friday, June 20th through Sunday, June 22nd, 2025 at the UT Dallas Davidson-Gundy Alumni Center in Richardson, Texas......

VCF Southwest starts tomorrow!
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techav On Incremental Improvement: With VCF Southwest almost here, and having run into a dead end on getting NetBSD running on my 68030 homebrew computer, Wrap030, I decided to circle back to my multi-user.....

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On Accepting Victories Where They Come - techav On Accepting Victories Where They ComeALTAt the end of my last post on getting NetBSD running on my 68030 homebrew computer, I had a (mostly) working root shell prompt in single-user mode. Well here.....

The end of this chapter of me exploring NetBSD for Wrap030, my 68030 homebrew computer.
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HyperCard stack that shows a card that says "RIP Bill Atkinson (1951–2025)"

Bill Atkinson, Macintosh Pioneer and Inventor of Hypercard, Dies at 74 Atkinson’s gleeful brilliance helped people draw on computer screens and access information via links.

RIP Bill Atkinson. One of a kind www.wired.com/story/bill-a...

Loading and a BASIC program from disk and running it on one user console of Multibasic, a minimal multiuser kernel for Wrap030, my 68030 homebrew computer.

On Major Milestones - techav On Major MilestonesI left off previously with init immediately crashing when trying to run NetBSD on Wrap030, my 68030 homebrew computer. I was completely lost and didn’t know where to start looking.....

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techav On Not Knowing Where to StartI have made tremendous progress on getting NetBSD to run on Wrap030, my 68030 homebrew computer. I learned I had completely misunderstood how NetBSD sets up hardware...

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On Celebrating Errors - techav On Celebrating Errors ALTIsn’t it beautiful? The lovely formatted tables of register and stack contents, the trace of function addresses and parameters, the error message … it’s the most beautiful...

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a green circuit board about 9 by 3.5 inches with 18 chips, a SCSI connector, a toggle switch, a battery holder, and some resistors and capacitors.

i'm pleased to release the Amiga 1000 SCSI Sidecar! this clone of the old Comspec SA-1000 makes a great storage solution for your A1000, paired up with a SCSI hard disk.

the design is open source under the CERL-OHL-P and available right here: github.com/schlae/a1000...

Kernel panic printout, which is great because it means that now my homebrew computer is getting far enough along in the NetBSD startup process to actually be able to generate a kernel panic.

Yay kernel panic!

techav On Making ProgressWith my Wrap030 homebrew computer operational again, I could finally get back to the work I had been wanting to do with it in the first place. I was able to get it running my...

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Serial terminal output from "Wrap030", a 68030 homebrew computer, showing the startup sequence and booting a test program from disk. The test program is initializing a hardware timer, which is triggering an interrupt (IRQ 4). The test program is acknowledging the interrupt, returning to the main loop, and resetting the timer.

A whole new world of capabilities just opened up for my 68030 computer.

On Recovering From Disaster - techav On Recovering From DisasterALTJust before disaster struck with my 68030 homebrew, I had a plan to fork the project and take it in two directions in parallel. The first would be my minimal Multibasic.....

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On Catastrophic Failures - techav On Catastrophic FailuresAfter working through a silly design mistake and then having to reverse engineer my own project to make up for my own bad habits, my 68030 homebrew computer was running great.....

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Photograph of a page in a graph paper spiral notebook showing hand-drawn signal flow diagram. The homebrew computer it will run on can be seen in the background.

Manually mapping out signal timing & propagation delays to 1ns resolution for planning a DRAM interface for a MC68030 running at 25MHz.

Every computer needs a good ASCII art banner that prints out on startup.

... Even if that's currently about all it can do.

On Keeping Good Habits - techav On Keeping Good HabitsI, like everyone else with any productive hobby, have more ideas and things I want to try than time and skill to implement them. I’ll start on developing something and then...

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A mess of rainbow-colored wires and logic analyzer probes attached to a sparsely-populated printed circuit board.

Trying to debug a stubborn logic bug with my 68030 homebrew stack. It looks like an Address Error exception, but that doesn't make much sense. Really tough to figure out with only 16 logic analyzer channels.

On Bodging Silly Mistakes - techav On Bodging Silly MistakesAfter a few weeks of rest and working on non-homebrew-related projects since getting my 68030 stack running 8-user BASIC, I’ve circled back around to the project. My goal is.....

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Looking Back - techav Looking BackToday, 26 March 2025, is the tenth anniversary of the first time I put power to a Z80 microprocessor in a breadboard and watched it blink some LEDs. ALTWithin a few weeks that Z80 would be...

It's been 10 years since I started building my first homebrew computer with a Z80 on a breadboard.
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On Regular Maintenance As I've mentioned before, I run a Proxmox VM server at home. It's a fun insanely-overpowered bit of hardware I've cobbled together over the years from what I had on hand or could get for as close to…

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