the difference that is no difference makes no difference
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 […]
So I was pretty chuffed with setting up my Frankenstrad using just a CPC-464 motherboard and a homebrew keyboard. However, as luck would have it, a few weeks later, the local auction site had a couple of real CPC-464’s for sale … so I bought one.
So I bought the motherboard out of an Amstrad CPC-464. This was like my Oric Atmos rationalisation . It’s cheaper to just buy the motherboard of some of these old computers, rather than the whole computer (especially when I add in postage from the UK to NZ). And I am more into these old computers […]
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