Uzebox Forums

hello THE SD CARD CAN RUN AT 48 MHZ NOW WITH A CLOCK AT 28MHZ IS IT POSSIBLE SHIFT THE REGISTER STATUT OF SPI TO SLAVE AND UZE THE FASTEST CLOCK ? MAY BE A CAPACITOR OR A RESISTOR OR A DIODE CAN MADE THIS TO WORK EXPLAINATION: LIKE IT IS A SERIAL REGISTER YOU CAN FILL IT AT THE SPEED CLOCK RATE WHAT...

HERE is schematic for optimal color mode code on 3 byte
one byte for port output value
one byte for ddr input
one byte for pull up resistor (on/off)

of course not applicable for actual uzebox , but may be for a new one (reloaded version )

OF COURSE A COMPRESION/DECOMPRSSION ALGORITHM must be impremented . i dont know if it is possible ?
here is a link of a free algorythm https://xiph.org/flac/api/index.html

but i don t know if it can be implemen,ted for the 644 LIKE i am not a c guru

YES I think that the hardware don t need big modification 2 network resistor can be added easly even directly ONTO OR UNDER the pin of the 644 HERE some photo of different network resitor type. one network need to be connected to +vcc the other one need to be connected to ground for the coding of th...

HERE IS THE IMPROVED COLOR SYSTEM AT TREE WIRES
UP TO X^Y LET 3^3=27 (TREE WIRE AT TRI STATE) LET 28 POSSIBILITY INCLUDING THE 0
THE DIVIDER GOT 100 OHM BUT MY BE OTHER VALUE WILL WORK TO

HAVE FUN

HI JUBATIAN By the way this idea is for a picture at 25 frame per second in the same logic at 50 frame per second you can display a pixel onto 4 let allow the cpu to get 6x4=24 cycle for compute a pixel what do you think about of course another external circuit schematic must be done for reset 3 pix...

HI Yes i got a scart tv here another idea for avoid the CPU to send dummy pixel one onto two a integrated ic the 7474 synchronysed on the clock can clear automaticly a pixel onto two "in fact it divide the clock by two" a clear pin permit to control the starting dividing like this just a c...

OK BUT unfortunatly i am not operational at all not with avrstudio and not with the scketchs i have just flash an atmega644 WITH ARKANOID. IT WORK ok with oscillator ttl at 28mhz and also with ttl oscillator at 32mhz (screen is shifted but a 3/4 of the screen is visible correctly) and stable but i g...

HI jubatian nice plane demo notice that this schematic is for one color it as to be repeater for other color yes for this mode you have to use the data direction register before send the color byte if effect the color must be coded in two byte for all tree colors but you will have at least near 24 B...

SORRY THE VALUE OF THE RESISTOR ARE NOT CALCULATED YET