When does the out finish on a ZX Spectrum?
To modify the border at the position of the first byte of the screen (see the 48K ZX Spectrumsection for details), the OUT must finish after 14365, 14366, 14367 or 14368 T states have passed since interrupt. As with the 48K machine, on some machines all timings (including contended memory timings) are one T state later.
What kind of processor does the ZX Spectrum have?
The main processor runs at 3.54690 MHz, as opposed to 3.50000 MHz. There are 228 T-states per scanline, as opposed to 224. There are 311 scanlines per frame, as opposed to 312.
Is the Sinclair ZX Spectrum compatible with Timex?
Sinclair licensed the Spectrum design to Timex Corporation in the United States. An enhanced version with better sound, graphics and other modifications was marketed in the US by Timex as the Timex Sinclair 2068. Timex’s derivatives were largely incompatible with Sinclair systems.
What kind of joysticks did the ZX Spectrum + 2 have?
The +2 (but not the 128K) had two Sinclair-type joystick ports built in (see the Peripheralssection for technical details on the Sinclair joysticks). These used the normal 9-pin connector, but, in an attempt to produce vendor lock-in, wired the pins differently to the standard used by other manufacturers.
What are the parts of the 128K ZX Spectrum?
128K ZX Spectrum Reference This section is broken into two parts: The ZX Spectrum 128K / +2and ZX Spectrum +2A / +3. Each of these may have several sub-sections. Within each section, you may find links to additional information elsewhere in this FAQ, or to other reference documents.
When to use a stub on a ZX Spectrum?
Stubs should be provided if a channel does not support either input or output (e.g. the stub may simply call RST 8 with an error code) The first two words being 8 denotes that the input and output routines are to be found in the shadow ROM.
Is the ZX Spectrum + 3 power supply the same as the + 2A?
The ZX Spectrum +3 power supply provides the same voltages as the one supplied with +2A/B. This power supply has the same DIN connector so can be used with the +2A/B.