VBlank Period 1

The STIC allows access to its control registers only certain time periods as part of its vertical refresh. These time periods are anchored relative to the VBlank Interrupt that the STIC generates and the Bus Copy mode that the System RAM implements.

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PAL/SECAM Intellivisions

No data is presently available for these systems. Given the lower refresh rate and higher clock rate of these systems, both VBlank Period 1 and VBlank Period 2 are probably longer than they are on the NTSC systems. New games should design for the tighter NTSC time windows.