Discussion specific to the DIP and TQFP packaged ZX devices like the ZX-40, ZX-44, ZX-32 and ZX-328 series. The differences between these devices is primarily the packaging and pinout so most issues will apply to all devices.
Updated versions of the ZX-40, ZX-40a, ZX-44 and ZX-44a firmware are available on the Downloads page. The update contains several enhancements and bug fixes summarized in the change history.