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General Category => Emulators => Topic started by: ralferoo on 17:08, 20 December 21

Title: A new cycle-stepped Z80 emulator
Post by: ralferoo on 17:08, 20 December 21
Not sure if this overlaps with another project by someone here (e.g. the timing seems to match @cngsoft (https://www.cpcwiki.eu/forum/index.php?action=profile;u=191)'s latest post), but I spotted this on https://news.ycombinator.com/item?id=29602223 (https://news.ycombinator.com/item?id=29602223)


https://floooh.github.io/2021/12/17/cycle-stepped-z80.html (https://floooh.github.io/2021/12/17/cycle-stepped-z80.html)


Haven't looked into it much, but the post looks interesting if you want to learn more about how emulators are implemented.
Title: Re: A new cycle-stepped Z80 emulator
Post by: GUNHED on 00:22, 21 December 21
Speed of the Z80 is different in different computers - even a the same crystal frequency.
Title: Re: A new cycle-stepped Z80 emulator
Post by: pelrun on 08:39, 21 December 21
I'm actively using flooh's existing z80 emulator for a project I still haven't announced (here) yet, so this is extremely interesting news.
Edit: the previous implementation is better for my specific use case, but this is still quite nice. Note that both are fully cycle accurate, it just changes how and when the cpu emulation is invoked.
Title: Re: A new cycle-stepped Z80 emulator
Post by: Longshot on 22:18, 22 December 21
Hi

To test if the Z80A emulation is correct for the CPC, it is possible to use test 1 of the SHAKER 1.9 benchmark program, available here:
http://logonsystem.fr/html/engdownloadlogon.htm

The document is accompanied by the results of SHAKER 1.9 on each type of CRTC (for test 1, all CPCs do the same)

And...Merry Christmas!!
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