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XOR - dodgy magazine referenceThe magazine reference section for Logotron's XOR has a link to a Spanish(?) magazine 'MicroHobby Especial'. All well and good, but the magazine arti…
The magazine reference section for Logotron's XOR has a link to a Spanish(?) magazine 'MicroHobby Especial'. All well and good, but the magazine article seems to about XORing bits, rather than moving chickens and fish around a maze. -
Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... .jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by ... = x ^ (x > 1)
xor e
ld e,a ... -
New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…
... b,28
fillscreen
xor a
ld (hl),a ... posn
ld a,56 ;erase car
ld (hl),a ... hl ;save road posn
xor a ;print new road
Erase part of memory in SPIN?A question for SPIN (or perhaps Spectaculator). If I have a game loaded in memory and would like to erase part of the memory while keeping the rest …
... memory and would like to erase part of the memory while ... exact, I would like to erase the screen memory and watch ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... this takes 2 bytes whereas 'xor a' takes only one. ... Insert line 6, 'xor a'
xor compares the chosen register ... ! First we need to erase the car ready to move ... , 32 ;new carposn
xor a ;set carry flag to ... ;save road posn
xor a ;print new road
AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…
... ,b"
;# values: AND=A, XOR=X, OR=O, BIT=B ... ^n)
inc b
xor a
scf
SETBIT ... ,a,b"
37 PRINT "XOR ";a;TAB 9;b,"=";USR ...Vertical XOR filler.. anyone?Hi, I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time? Just tryin…
Hi,
I was just wondering whether a vertical filler using XOR has ever been used on Speccy demos/games and if yes when for the first time? Just trying to find some references..XOR screenshotsXOR from 1987 is missing the loading screen and the in-game screen, Xor from 1990 has the in-game screen from another game.
XOR from 1987 is missing the loading screen and the in-game screen, Xor from 1990 has the in-game screen from another game.Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... /> * gonna have the retro "erase sprites using XOR and then paint them ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... /> ret
; erase last char written to screen ... shiftand1otherlinepressed
.toomanylines
xor a
inc a
.only1halflinepressed
xor a ; zero A
...
inc c
xor a
ret
...Advice about drawing sprites on spectrum I've coded sprite drawing before and know all the theory about masks from a long time ago (microhobby rules! ;), but since I did it on Amiga with ha…
... actually spending time to erase sprites slows things down ... , xor #1, xor #2, xor #3.
To erase: xor #3, xor #2, xor ... #1.
To draw next frame: draw background, xor ... #1, xor #2, xor #3.
< ...Advice about drawing sprites on spectrum I've coded sprite drawing before and know all the theory about masks from a long time ago (microhobby rules! ;), but since I did it on Amiga with ha…
... actually spending time to erase sprites slows things down ... , xor #1, xor #2, xor #3.
To erase: xor #3, xor #2, xor ... #1.
To draw next frame: draw background, xor ... #1, xor #2, xor #3.
< ...EmuZWin supports 256 color gamesI am sorry starting new topic, but you see this info is important a bit: new version 2.4 of the EmuZWin is available to download, and it supports 25…
... three options. Normally A xor B xor B must be = A ... on screen using XOR, first time to erase it, and second ... This includes internally leveled OR, XOR, AND, but provides correct restoration ... original picture when XOR with the same value ...Can Anyone explain sprites in Jet Pac/Atic Atac etcJet Pac was 16k, and yet the sprites were impressively fast. I notice they had a slight flicker at times, but were notmally pretty flicker free. W…
... of sprite graphic data to erase with.
exx ... br /> ld de,(_Sprite_ScreenAddr)
xor a
ret
... /> ld de,(_Sprite_LastScreenAddr)
xor a
ret
... ld hl,(_Sprite_ScreenAddr)
xor (hl)
ld (hl),a ...z88dkHello. I'm an spanish user of spectrum (and naturaly of this page). I have a question. I want to start to program games with z88dk, but I need a goo…
... flicker free strategy is to erase and draw things in a ... to avoid flicker - don't erase anything. It also seemed logical ... sure the sprites do not erase them.
"struct sp1_update ... of sprite are mask, or, xor and load. Each of these ...Sprite adviceHello. So, I'm slowly getting to grips with Z80 assembly - currently equal parts frustration and enjoyment. Now looking for some advice to help shift…
... .
Draw the sprite using XOR in the NEW position, then ... the sprite using XOR in the old positiion to erase the previous ...How does interrupts work?I am a little confused regarding the interrupts on the Spectrum. If I have some hundred bytes of machine code started with, say, [B]RANDOMIZE USR 300…
... to the right) and just erase the small part at the ... 's example:
[CODE]xor a ; black border[/CODE]
A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... starfield with parallax. Uses plot/erase star method (not scrolling whole ... /> Thanks to roko for the XOR plotting idea.
Again ... screen byte
XOR (HL) ; XOR with current star byte
New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…
... b,28
fillscreen
xor a
ld (hl),a ... posn
ld a,56 ;erase car
ld (hl),a ... de, 32 ;new carposn
xor a ;set carry flag to ... hl ;save road posn
xor a ;print new road
Double Dragon 128k - The graphicsAs you are all probably aware, I tried gathering a team of people together a few years back to make a totally re-programmed version of Double Dragon …
... to either have your graphics erase your background in blocks as ... it gets drawn with some XOR operation (like drawing UDGS over ...Programming flash eprom on DIVIDE+Can you test it on DIVIDE PLUS ? [url]http://velesoft.speccy.cz/other/flasher-divide-plus.zip[/url] (This flash utility is WINSTON's flasher for dia…
... to ram adress 0
XOR 32 ;disable writing in low ... ram and each system can erase and refresh this memory if ...Donkey Kong - TransparencyHi, I might not recall it perfectly but as I was playing the Donkey Kong for ZX-spectrum 48k - I somehow noticed that the Monkey jumps with something…
... screen memory, and that will erase what was there already and ... /> The other useful operation is 'XOR'. When the bytes are combined ... a second time, they actually erase what was drawn the first ...Sprites masterclassHi All, You guys are probably tired of explaining sprites but I'd like to clarify a few things if possible. I've sorted the vertical aspect of scro…
Need to scroll one column using m.c.I've used many of the available routines to scroll the entire screen in any direction, but I'm not being able to find one that would allow me to scro…
... of decremented value
xor l
and e
xor l ; set bits 5,6, ... byte
ld (hl),0 ; erase old one
ld ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... this takes 2 bytes whereas 'xor a' takes only one. ... Insert line 6, 'xor a'
xor compares the chosen register ... ! First we need to erase the car ready to move ... , 32 ;new carposn
xor a ;set carry flag to ... ;save road posn
xor a ;print new road
Anyone know where this is going wrong?I've written a simple routine to make a block drop from the top of the screen, but for some reason it wont 'cover its trail' so to speak. The block i…
... , as there's nothing to erase on that row). The routine ...
ret nz
setz: xor a
LD (a1), A ...Strider II (and others) + 3 disk versionsHello everyone, I've been working on converting some games to be able to load them from the +3 floppy. I started with single load games but now Im i…
... 7, ROM 2 (DOS)!!
XOR A
OUT (254),A ... /> LD (HL),A
LDIR ;erase screen
PI_1: ld a ...Game loopJust working on my first ever Spectrum game, and am struggling to work out what the game-loop should look like. I've got interrupts enabled (mode 2)…
... />
If you want to erase and then redraw, you want ... /> If you want to just XOR sprites on screen, it may ... totally ignore this issue because XOR suffers much less from flicker ... from flicker because they never erase anything. Instead they draw completed ...hash function permutation tableI'm using a simple Pearson hash function to generate keys for a $(103,6) array using a 256-byte permutation table. How do I arrange the entries in th…
... 's a version without the XOR. It just uses add instead ... ", "DATA", "DEF FN", "DIM", "DRAW", "ERASE", "FLASH", "FORMAT", "FOR", "GO SUB ...
