Started with Casio-PB700 (look it up), then Sinclair ZXSpectrum, Commodore 64/128 and Spectravideo328.
Areas of interest: Image processing, Bluetooth, Health related applications, Optimization of computationally intensive algorithms (in other words, trying to make an iPhone do what it was not built to do).
When I have time:
Q&A for professional and enthusiast programmers
Q&A for software developers, mathematicians and others interested in cryptography
Q&A for Bitcoin crypto-currency enthusiasts