Spectrum Computing

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)

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.