Reply to post: Re: What we need

ZX Spectrum reboot latest: Some Vega+s arrive, Sky pulls plug, Clive drops ball

Michael Strorm

Re: What we need

As far as I'm aware, for a 6502 of given clock speed, you could expect broadly equivalent performance from a Z80 clocked at double that speed or slightly more.

In other words, the Atari 800's 1.79 MHz 6502 would have been roughtly equivalent to the Spectrum's 3.5 GHz Z80 (#), the BBC Micro's 2 MHz 6502 a little faster... and the C64's 1 MHz 6502 was still on the slow side.

(#) Though the Atari's custom graphics hardware (including hardware scrolling, hardware sprites and multicolour character-based modes) meant that it didn't have to inefficiently use CPU cycles on certain things that the simpler Spectrum would have needed to.

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