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How does that interact with the NMI on the ZX Spectrum? I'm not a ZX programmer, but I've read that ZX has a NMI that fires and can't be reprogrammed.
by Flow 6y ago
How does that interact with the NMI on the ZX Spectrum? I'm not a ZX programmer, but I've read that ZX has a NMI that fires and can't be reprogrammed.
- rwmj 6y agoYou can't use it if the system has an NMI because it could push a return address on the stack at any time (unless there's a way to mask the "non-maskable", perhaps by disabling all devices that could generate NMIs). Luckily there was no NMI on the basic Spectrum. I believe it was only used by those game copying dongles where you would press a button to stop the system and snapshot memory.