VELESOFT wrote:You are right But screen timing is bad (TV norm need 50 fps). Pentagon use only 48 fps, it's correct ? Is possible connect this machines to modern TV ?
Yeah it is also the part of standard. 71680 clocks in a frame with 320 lines. First, ANY CRT TV must eat such frame seamlessly.
Second - every LCD tv/monitor/whatsoever has absolutely no bounds for hor/vert frequencies, except for shit in firmware writer's heads. So if it won't accept 48Hz it is the fault of LCD maker, not of classical pentagon.
VELESOFT wrote:Pentagon 2.666 use compatible timing with old models ? (224 tacts per line and 320 tv lines) Also 48 fps ? Same number of CPU tacts per frame ? VGA output work at which freq ? Multicolors on VGA will work ?
This is not questions for me so I let KOE anwser them.
As for me, ZX evolution (also known as pentevo, or pentagon evolution) will be able to scan-double scanlines from 15kHz to 31kHz, while leaving 50 (or 48) Hz intact. Again, there are no limitations in CRT pc monitors that will prevent them from working at 50Hz frame rate (in contrast wth horizontal unit which can't work at 15kHz). Regarding LCD monitors, it will be up to their firmware writers heads, as I said.
So in ZX evolution, there will be 50hz/31kHz scan-doubling, which obviously will leave all multicolors intact. Also there is some trick possible to fix 48Hz issue while remaining multicolors. Just switch Z80 to 7Mhz turbo at a predeifned time until end of frame so that 71680clocks/frame remains intact.
VELESOFT wrote:All Pentagons in russia use always same timing ? (48 fps)
Yes, until Zx evo comes to reality.
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