Tag Archives: retro

Zolatron 6502 computer: decoding the RAM more reliably

In my earlier post on address decoding logic, I mapped out a fairly simple way of dividing up the 64k address space for my 6502-based retro computer. But maybe it was too simple. There is one slight complication – easily fixed, but which will require the introduction of another chip. And the reason for this is something lacking in memory…. Read more »

Ghost in the machine: a BBC Micro on an FPGA

The BBC Micro was the machine that really got me hooked. The Sinclair Spectrum was the gateway micro, but it was the Beeb that got programming into my veins. So much so, indeed, that not long ago I finally gave into temptation and bought a BBC Master Turbo on eBay. It didn’t last long. Although fully refurbished, any machine of that… Read more »

Altair-Duino – the low-cost Altair 8800

I’ve wanted an Altair 8800 for a long time now. It’s not that you can do much with it. But it is such an important part of computing history. Famously, the January 1975 edition of Popular Electronics featured the Altair 8800. Or rather, it featured a non-working prototype. The first working machine had gone missing in the post. The magazine… Read more »

Zolatron: logo upgraded

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Yeah, I know what you’re thinking … he really should get on with building the damn computer. But I have a thing about fonts, so sue me. I was rather pleased with the original Zolatron 64 logo. I chose a font called Eurostyle because it was the most 1970s-looking one on my machine. Then I read about the history of… Read more »

Dreambox: adding play value

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It was an old mate of mine who introduced me to the phrase ‘play value’. It’s used to describe a machine with lots of dials, buttons and switches with which you can amuse yourself. I think we were both staring into the cockpit of an AV-8B Harrier II jet fighter, parked at a US Marine Corps base in North Carolina,… Read more »

Retro to the core

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There are some things that are hard to get your head around unless you can actually see them. Being a computer history fan I’ve often read of core memory but never quite got to grips with how it works. So one day recently I just thought, ‘the hell with it – I’ll go on eBay and buy some’. Which I… Read more »

HMV 1960 valve radio Raspberry Pi case

So I was looking around for a case for a Raspberry Pi and I noticed this old radio gathering dust in the cupboard. And it all just got out of hand from there. The HMV Model 1376 valve radio dates from 1960. When I bought it in a junk shop for a few quid it was working. When I took it… Read more »

Something useful

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If you’re into retro computing, or building stuff based on SBCs such as the Raspberry Pi or BeagleBone, you’ll be familiar with a certain refrain from your significant other and even those you consider your friends. They’ll look at your latest project — perhaps a restoration of a 1980s home micro, or a simulation of a 1960s mini computer, or something… Read more »

Out on the trailing edge…

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I was raised in an eight-bit era. My first computer was a Sinclair Spectrum, but I hated the dead-flesh keys and the clumsy method of editing Basic programs. So I upgraded quickly to a BBC Micro (first B, then Master). But while I cut my teeth on Z80- and 6502-based micros, there’s lots I missed out on – stuff I… Read more »