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Change PAPER and BORDER colours from machine codeHow do you go about changing PAPER and BORDER colours from machine code? I've forgotten the system variables for border and paper.
... from machine code you do OUT 254,A
You set ... , to give yourself for example 256 characters. -
Change PAPER and BORDER colours from machine codeHow do you go about changing PAPER and BORDER colours from machine code? I've forgotten the system variables for border and paper.
... your graphics data; up to 256 UDGs stored in sequence, anywhere ... way is to just write out LDI then DEC E then ... space, each byte is addressed 256 bytes higher in memory.
analysing program variable usageIf I wanted to count the number of times each variable is referenced while a program is running (not the number of times each variable is referenced …
... , so it will give "Integer out of range" if any exceed ... b$=STR$ (PEEK (a+1)+256*PEEK (a+2)):
PRINT ... /> jp z,$046c ;"B Integer out of range"
ld (hl ...analysing program variable usageIf I wanted to count the number of times each variable is referenced while a program is running (not the number of times each variable is referenced …
... a little while to sort out the relevant statements from the ... FN p(a)=PEEK a+256*PEEK (a+1)
1000 ... FN p(a)=PEEK a+256*PEEK (a+1)
[/code ...ULAPLUS on ZX-Evo!It was really easy for us to add it. So it is here fresh in our repository: [url]http://pentevo.googlecode.com/svn/avr/current/default/zxevo_fw.bin[…
... select modes, like this:
out (#bf3b),#40+0 -- turn off ... ),#40+1 -- ulaplus 256 color mode on
out (#bf3b),#40+2 ... -- ulaplus 256 grayscale mode on ...ULAPLUS on ZX-Evo!It was really easy for us to add it. So it is here fresh in our repository: [url]http://pentevo.googlecode.com/svn/avr/current/default/zxevo_fw.bin[…
... select modes, like this:
out (#bf3b),#40+0 -- turn off ... ),#40+1 -- ulaplus 256 color mode on
out (#bf3b),#40+2 ... -- ulaplus 256 grayscale mode on ...Why no PLOT, etc. on bottom two lines?I was pondering if there was any way to get PLOT, etc. to address the full screen from BASIC without having to write a few lines of assembler to bypa…
... attributes file, so it's out of bounds but not by ... $( TO 2)+h$(6 TO ))*256:
LET bit=x-8 ... to +175. 'b$()' is a 256*8 byte array of BIN ...Frames Per SecondHow many frames per second did the ZX Spectrum run at? I've found games that are 12.5fps but Ive recently been informed some games were at 25fps ...…
... you to wash your mouth out with soap! :razz:
256 pixels makes an effective upper ...maths questionNB this will probably show what a tragically low level understanding of maths I have, but hey ho :-) for some reason the other day I suddenly remem…
... have a calculator, and worked out SIN, COS and TAN by ... get the result. I worked out COS by adding 90 degrees ... also to use 128 or 256 'degrees' rather than 360, and ...CMWC random number generator for Z80Seeing the interest regarding the [URL="http://www.worldofspectrum.org/forums/showthread.php?t=23070"]Xor-Shift random number generator for Z80[/URL]…
... byte which is being rotated out (r == 8 == number of x ... by definition (0..255 < 256), and that the carry c ...
