The second part of the question comes from another article I wrote BEFORE the reverse engineering work. As the question states, César did his own research and discover that strange feature.
With time, his emulator has evolved and now it supports other clones, such as ZX-UNO and TBBlue.
The following is an excerpt from the article César Hernández Bañó and I wrote about the internals of the Inves Spectrum+, exposed after a detailed work of reverse enginnering.įirst, some background: César is the author of the first (and AFAIK, only) emulator that handles the oddities of the Inves Spectrum+. Why does this occur, and why would this feature have been built into the Inves Spectrum+? It seems that port reading operations are not affected, so I cannot test if this works for odd ports too, as the only even port the Inves has is the Kempston joystick (port 223), which is a read-only port. I've tried this with even ports other than 254 and it works. That is, any value written to port "p" will be AND'ed with "v". Then, port "p" will be affected by mask "v". If I do a: FOR n=0 TO 63: POKE n*256+p,v: NEXT n
This feature can be used to alter the way other ports work. After some research, we discovered that pokeing ROM addresses whose least significant byte was 254, blocked any data from entering the ULA. It happened that, if you poke'd certain ROM addresses (yes, ROM addresses), the border didn't respond to new BORDER commands, so the speaker to BEEP commands. S to 5XL Sinclair C5 T-shirt for Women.After reading mcleod_ideafix's answer about the Inves Spectrum+'s "randomize of death", specifically his article on the subject, one thing struck me as odd. Kindle only The A-Z of Sinclair ZX Spectrum Games: Volume 3 - Kindle Edition ZX Spectrum Colour Clash T-shirt by Nerd Shirts Sinclair ZX Spectrum Logo T-shirt for Men Sinclair C5 T-shirt for Adults. Unofficial and Unauthorised by Kieran Hawken. Sinclair ZX Luggage Tag High Quality PVC The Spectrum of Adventure: A Brief History of Interactive Fiction on the Sinclair ZX Spectrum Men's Class of 1982 ZX Spectrum T-shirt Games Were Better When They Took 20 Minutes to Load T-shirt 101 ZX Spectrum Games To Play Before You Die - 1982 to 1993, by Malcolm Parker Retro Heaven ZX Spectrum Coaster The A-Z of Sinclair ZX Spectrum Game.
#SINCLAIR ZX SPECTRUM DISEÑADOR CODE#
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