the difference that is no difference makes no difference
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 […]
The Acorn Archimedes A3000 came out in 1989. My vague recollection of the era is that the Amiga 500 was really popular around then, and even though the A3000 was a lot more powerful, it was in a price bracket that made it a lot more expensive. I probably didn’t know how much more powerful […]
So in part 1 (Amstrad CPC ROM emulation using an STM32F4) the code I had for emulating a ROM (and some IO) with a cheap STM32F4 board for the Amstrad CPC 464 ran in a continuous polling loop. The code just watched _ROMEN and _IORQ going high and low, and acted appropriately. The (sort of […]
UPDATE: There is a ‘part 2‘ to this article. In that I use interrupts, instead of the polling technique shown below So, in emulating a hardware ROM in real time with an STM32F4 I hooked up a cheap US$10 STM32F4 board to my Acorn Electron to act as both a sideways ROM board and a sort of […]
UPDATE (20190523). There is a ‘Part 2’ of this article in Acorn Electron ROM Emulation with an STM32F4 that describes using interrupts to emulate ROMs. The article below involves using ‘polling’ to perform a similar function. I remember reading dhole’s Emulating a GameBoy Cartridge with an STM32F4 some time ago thinking that it had a lot […]
TZXDuino is a cool Arduino project that is basically a standalone hardware cassette audio playback unit for old computers. You hook up an Arduino, a microSD card adapter, an I2C LCD display and 5 buttons. Load a microSD with lots of game dumps, and hook that up to the audio input of your ZX Spectrum […]
I recently bought a BBC Micro Model B. It sold ‘as is’ and I had no idea if it worked. The case was very yellow. It came with a 5 1/4″ drive, cassette player, several books and original versions of Elite on disk and cassette. It did not work, and ended up having a number […]
A while back I burnt some 27C160 EPROMs for some of my Amigas. This allows you to have 4 kickstarts in an A500 or A600. Normally you would wire up two switches to the upper address lines of the EPROM to select the 4 images. But I thought there must be some way of selecting […]
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