Casio PV-1000/Video

The PV-1000's video timing divides a frame into 288 pixels horizontally by 262 scanlines. The pixel clock is the crystal divided by 4, or roughly 4.47MHz. This corresponds to an exact pixel aspect ratio of 48:35, or approximately 4:3. This makes the horizontal sync rate the quite-slow 15536Hz and the vertical sync rate the almost-normal 59.299Hz

Of those 288 pixels, 224 contain actual video content. These 224 pixels are already significantly wider than the majority of contemporary or even modern TVs can display.

Of the 262 scanlines, 192 contain actual video content. This is significantly shorter than the majority of TVs display. The ULA draws a solid color of the programmers' choice for some number of scanlines above and below.

On each active scanline, the ULA asserts /BUSREQ for 248 pixels so that the Z80 gets out of the way in time for the ULA to drive the video.

Unfortunately, we don't yet have any more specific timing information. Research is on-going...