the difference that is no difference makes no difference
The Dragon 32 could be expanded to include a DOS cartridge. This contained a small DOS ROM and Floppy Disk Controller chip. You plugged a 5 1/4″ drive to the cartridge and you had a working floppy drive. There were a few companies that made similar expansions. Some are documented on the World of Dragon […]
A few years back I finally acquired an Acorn A3000. Like most A3000’s it did not work due to battery damage. I hacked away at it and eventually got it to work. My fixes weren’t exactly pretty, but I got it going and out of all the 80s home computers I have, I think the […]
So I finally bought a Dragon 32
A few years back I built a Funvision , then later a Colecovision using a breadboard. These were fun projects and I always thought there were quite a few other 1980s computer designs that were ‘achievable’ within the limitations of breadboards. To me these are good educational projects and you have to plug together seemingly […]
So I had an Amiga 500 in my late teens/early twenties. I had the 512K RAM expansion (actually a home brew one) and one external floppy drive. I wrote a heap of 68000 assembly back then using that setup. Hard drives were around but they were the ‘stuff of dreams’. They were so so expensive […]
So in the previous article I upgraded my SV-318 from 16KB of CPU RAM to 64KB of CPU RAM. But I really wanted to emulate the floppy disk controller on the Spectravideo. If you are familiar with the early Spectravideo’s you may assume that this is a silly goal. More on that later.
So I was given this Spectravideo SV-318 quite some time ago (thanks Bryce). It’s quite a cool looking computer. The red joystick knob on the right is an interesting feature.
So that Galaksija I made up was quite fun to build and get going. And I’ve found a few other homebrew projects like that. Recently I’ve built an Amiga 500++ (thanks Rob), and then I came across the Omega MSX2 . Sergey has designed a set of boards that make up an MSX2 home computer […]
A few months back I came across an ebay ad for a circuit board for a Galaksija. I had never heard of it before. The original Galaksija came out in 1983 in Yugoslavia. The Galaksija wikipedia page has a lot more info and the spetsialist-mx.ru site has a big section on it (in Russian). That […]
This is really part 2 of Emulating a hardware ROM in real time with an STM32F4. In that post I used a cheap STM32F407 board to emulate some ROMs and some IO ports for an Acorn Electron. ie. The Electron thinks it has a bunch of hardware attached, but it’s simply the STM32F407 board pretending to be […]
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