Z80 DDFD3 - redcode/Z80 GitHub Wiki

Platform: ZX Spectrum
Author: Helcmanovsky, Peter
Release date: 2022-06-10
License: MIT
Links: Discord post
Download: zip (hosted) - zip (Discord post)

Description

Checks if machine code DD DD E5 does execute as push ix. Some emulators may incorrectly eat two DD prefixes as special kind of nop, forgetting the prefix completely and execute E5 on its own after that.

Green border means the expected push ix was executed, red border means the CPU lost DD prefix state and executed push hl (E5 machine code).

Expected results

img

Copyright © Manuel Sainz de Baranda y Goñi, Tony Brewer and Peter Helcmanovsky
Published under the terms of the GNU Free Documentation License v1.3

⚠️ **GitHub.com Fallback** ⚠️