First ZX Spectrum emulator for Psion 3 series
ZX Spectrum emulator was one of cool Psion 5 applications I really missed on my Psion 3mx. In the 1980's, my first real contact with computers started just with the ZX Spectrum. Soon, more powerful computers appeared in my life, so now I am writing this page on a PC with about 300x faster processor, 3000x more memory and a storage equivalent to 7000 90-minutes casettes! But, like in other things in the human life, the first experience is the most important, something that everyone returns to.
At the start of work, writing an emulator of 3.5 MHz Z80 processor running on a poor old I8086 processor seemed as impossible, even if clocked at 27.684 MHz. A lot of highly optimized assembler code with some really nasty tricks together with going to hardware limits of Psion computers was necessary to accomplish this task.
Following screenshots were taken in Gray color mode and Fit screen mapping.
I have a lot of plans how to improve it further. Here are some tips for 1.1 version:
Do you have a good feature tip for the next ZXemul version? If so, contact me.
The installation and usage instructions are included.
Any comments, suggestions or questions are highly appreciated. To contact me, send me an e-mail to firstname.lastname@example.org.
After 18 years since its creation, I released the source code of ZXemul on GitHub.