Today I discovered a thread about the Whitby Computers Spectrum Simulator for the C64. At around 10th message David Tindale, the original author wrote some funny facts about the so called "Spectrum Simulator". I always thought it was just some program that emulated CIRCLE and other commands that were missing in C64's BASIC. It turns out that it was a pretty complex translator of ZX's ROM for the 6502. Most interesting fact, it can read and write on ZX Spectrum's cassettes!
https://www.lemon64.com/forum/viewtopic.php?t=20387
There are some images of the thing here:
https://www.subito.it/informatica/cartu ... 824482.htm
(it's an ebay-like site, so the link may be dead soon)
Whitby Computers Spectrum Simulator for C64
Re: Whitby Computers Spectrum Simulator for C64
Ah, so a hand coded reimplementation of the Speccy ROM in 6502. I'd have guessed it had to be something like that to function at any kind of speed, actually emulating a Z80 would've been a very tall order.
Impressive that he also got it loading actual ZX tapes via the C64's slightly weird tape system though.
Impressive that he also got it loading actual ZX tapes via the C64's slightly weird tape system though.