is interlaced supported please?
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With a cathode ray tube, the ZX Spectrum has a progressive display. With a modern LCD display and careful CPU timing, it is possible to create an interlaced display. You can read more about it here: https://www.facebook.com/groups/1066251293516270/. But ULAplus only specifies how the palette is defined, not how the video display is generated. The titles in this compilation don't use the LCD-interlaced mode.
when will we get a ula that lets use use the full 64kb of ram that suffers contention and lets us define video modes? 320x200 with 16 and 256 colours as well as 256x192 512x192 640x256 like next and hardware interlace and vdp9990 konix multi system hardware and oh! just everything! well lets face it it wont be long before we just connect a tv to the hdmi output from the byte delight hdmi interface theres a quad core pi zero wonder if it can encode mpeg2 avi video while outputting zx screen$ ?
Probably never. The ULA can only access bank 5 and 7 on a 128K machine which would give you a maximum of 32K to play with. Expanding the RAM so other pages were available to the ULA would be a bigger hardware mod than most people are prepared to do. Even with 32K, a 3.5MHz Z80 isn't really adequate to driving such a big display file.
http://www.e-basteln.de/computing/65f02/65f02/
100mhz 6502!
ula+ has timex hi rez 512x192 but no attributes yes? could ink n paper colours be altered for a word processor?
sam has line interrupt register but only 128 lines per frame ula+ doesnt have line interrupt?
what are the video modes supported by ula+ please? do u understand the floating bus? does this mean zx spectrum cant access 64k of ports?
sam haz hi res mode 3 512x192 but only 2bits per pixel so 4 colours but mode 4 with 4bits per pixel uses a colour lookup table with 16 7bit valus ie 128 colour palette but also the hmpr port has 2 bits so that in mode3 you can switch to 4 x 4 sets of colours this can be done along a scan line according to an article in world of sam every 19 pixels but a dma is 8 times faster ram to port write 2tstates wed nearly get 16 colours per scan line at 512x192
even the bbc model b has a 12bit 4096 colour palette now with 16 colours onscreen thats 40kb of video ram no?
https://github.com/bitshifters/bbc-nula/blob/master/readme.md
The BBC Micro VideoNuLA is a palette enhancer. In that respect it's a bit like ULAplus. It enables you to change the output of the default 16 colors to a selection from a palette of 4096 colors. Screens take up the same amount of RAM. But, the 6502 has memory addressed I/O, so there is no penalty for using a wide palette. The Z80 has 8-bit I/O, so using more than one byte per palette entry limits how many colors you can change on a palette line. The software HAM256 mode (which can display all 256 colors on screen) would not be possible with a wider palette. And ULAplus gives you 64 colors on screen from a palette of 256, which generally gives better results than 16 from 4096.
ula+ is 12kb video ram but the full 16kb suffers contention and also the remaining 4kb has some system variables from the basic rom and the interface 1 rom too no? so theres no xtra ram in the ula+ ? but spectra adds 32kb no? u sure its impossible to add hardware interlacing? would that double the vertical resolution were it possible?
have you seen the atari running zx spectrum software? think she needs the rapidus similar 2 the c64s super cpu
You can read more about the chip here: https://www.msx.org/wiki/Yamaha_V9990. It really only makes sense to connect it to an MSX though because there is virtually no software available for it on other platforms.
i would like to buy 20 ula+ can you help me i need to send them to hardware and software developers in the zx spectrum scene please
http://members.inode.at/838331/
Leszek Daniel Chmielewski his bmp2scr helped me make my sam full screen animation