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Calculating the address of a pixel?Hi Folks, Is there an easy/quick way of calculating the memory address of a pixel? So for example, if I wanted to "plot" pixel at screen coordinate…
... addresses.
The screen layout (not its size) is ... character (if you remember the screen loading of Fairlight, that's ... -bit value can hold both X,Y values. Yes: you can ... effects, for example: having the screen divided into three horizontal blocks ... -
yeah - unix for zx spectrumI started a new hobby project. An operating system for ZX Spectrum. A unix clone. Talked to my friend about it and he asked me what if after I'm done…
... font anywhere on the screen (x...0-255, y..0-191) and it ... a second to draw entire screen. Then again you can have ... -
Utility or routine to save/display imagesLet's assume I have an image or sprite at coordinates x,y with w witdh and h height. If I were to store this image, which storage method would allow …
... image or sprite at coordinates x,y with w witdh and h ... the the image after specifying x,y, w and h.
screen into UDGs (courtesy of Bloodbaz ... /> Thanks. :)[/QUOTE]
Is X the start of a column ... -
SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
... command to specify the x/y pixel position to PRINT ... jr z, getyp ; X and Y co-ordinates and move to ... /> ld (chrad), hl ; screen and calculate the address in ... position, place it on the screen
and a ; ... left hand side of the screen.
ld a, (coords_y ... -
Serial protocol, help!Hi, simply trying to find best way to transfer programs from PC to real ZX Spectrum for testing purposes. Under Windows I tried using Spxfr and it w…
... code
1030 SAVE *"b"SCREEN$ [COLOR="Red"]- or LOAD, as ... course, replace the SCREEN$ bit with whatever CODE x,y that you need ... -
Frank N SteinThis one > [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0001849[/url] Always seems to crash about level 7 (maybe a bit more) or so with an …
... that anyway on the options screen).[/QUOTE]
You might ... AT y,x;" /144"; AT y,x+1;" /145": LET r=1: LET y=y+1 ... y+1,x;"/144"; AT y+1,x+1;"/145": LET r=1: LET y=y ... =2 THEN PRINT AT y,x;"/146/147"; AT y,x+1;"/148/149 ... -
Print TextHow do i print text on the bottom left row(memory location in attribute 23295) of the screen in assembly? I understand the parts better on paper and …
... for display text to the screen.
It doesn't ... /> It will print anywhere on screen and in whichever PAPER and ...
;
; $16 - PRINT AT X, Y
;
; $0A - COLOUR ((PAPER ... -
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... "79"
1510 LPRINT AT x,y;"Some bright white text on ... the lower part of the screen too.
Hope this ... -
Move objectHi again, I am using paper colors to represent game objects. I have a "paddle" that is 4 pixels wide. I save its position as a 2 byte word in memory…
... better idea than storing the screen address directly. For one ... with X/Y coordinates and doesn't have to care about screen addressing ... single routine that deals with screen addressing, you only have ... to convert your X coordinate to a screen position might look ... -
writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... the Speccy display to the screen...
[quote]
... what resides in Speccy's screen memory into what appears on ... /positions of pixels on a screen etc.?
[/quote]
... get equivalent attribute value for x,y positions of speccy display. ... -
I am a simple man....a layman if you will!...but I had a Spectrum when I was 12 years old that I loved more than was healthy! It gave me a love of computers which remains to this day and I …
... off accelaration. load the screen to test if it works ... erased to show the "OK, x:y" message.
... back to main emulation screen, clear OK message and ... type
CLS:LOAD"" SCREEN$:PAUSE 0
then ... window.
5.Your screen will be reloaded and ... -
Move objectHi again, I am using paper colors to represent game objects. I have a "paddle" that is 4 pixels wide. I save its position as a 2 byte word in memory…
... with X/Y coordinates and doesn't have to care about screen ... to convert your X coordinate to a screen position might look ... paddley ; adress of start of screen line for paddle
< ... ; copies attributes = PAPER 6 to screen
ld h, ... -
Can anyone see a way to speed up the following line of code?Hi Folks, Been looking at bottle necks in my code using BASin's Profiler and the following line (well the 2nd LET statement) is somewhat slow. [COD…
... again, perhaps start with a X$, Y$ and Z$ for the different ... to display data on the screen. That needed to have p ... -
Frank N SteinThis one > [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0001849[/url] Always seems to crash about level 7 (maybe a bit more) or so with an …
... spot. An example:[CODE]IF SCREEN$(x+2,y) = f$(num) + f$(num ... -
Birthday PlotsHello all; When browsing the web, I stumbled across an oddity known as Birthday Plots. In effect somebody enters a numeric date and the computer prin…
... make full use of the screen, thus:
[code]
260 LET x=(r(k,1)-l1)*xmod ... )*ymod: PLOT x,y: DRAW px-x,py-y: LET px=x: LET py=y
Gremlin Graphics is back - Bounder remake for iOS announced[url]http://www.eurogamer.net/articles/2011-07-18-gremlin-graphics-back-in-the-game[/url]
... you can't see the screen very well...which isn't ... set that as the zero x,y,zCool BASIC tricks and tips!Following on from Dunny's excellent suggestion of a compendium of BASIC tips + tricks, I believe it would be better to have a topic dedicated to it. …
... likely to be a full screen input routine and to this ... :
[LIST]
[*]X & Y input location
[*]Input length ... SUB 1060
230 REM Screen
240 GO SUB 1110 ... /> 630 REM i1=X
640 REM i2=Y
650 REM ...Othello/Reversi Validate and Make MovesI'm working an Othello/Reversi game The board is represented as a 2d array 8*8 ie: 00000000 00000000 00000000 00012000 00021000 00000000 00000000 000…
... draw board
110 FOR x=1 TO 8
120 ... y,x; INK a(x,y)+3;"XOO"(a(x,y)+1)
199 NEXT y: NEXT x ... /> I know to offset the x,y of the circle to match ... a quick question, what is screen width/height in pixels?
line, plot and circle in whole 256x192 displayhi! are there some way to draw lines, or whatever, in the whole 256x192 display, than just the above 256x176 part? (this is the msx1 version i made o…
... dod3 ;no swap if X>Y
LD ... are used to calculate the screen address ------------
;See ... H,B ;now HL = screen addr
AND %00000111 ... (HL),A ;move to screen
POP HL ;coords ...Multi-screen mazes?Well, it's been decades since I last mucked about with speccy BASIC, so over the last couple of weeks I've been starting out as a newbie learning a b…
... 'll try to do something screen by screen for now rather than ... out with a small 2x2 screen map, and see what happens ... about the X Y difference when the player leaves a screen. I was ... was about to enter the screen so the player doesn't ...Simple SpriteHow do you draw a sprite on the screen? For example i want to draw a smiley face sprite and would like either a link to a tutorial or a very well com…
... can calculate a screen display position from the x y ('PRINT AT') position ... sprite co-ordinates stored as x y character positions (row/column).Multi-screen mazes?Well, it's been decades since I last mucked about with speccy BASIC, so over the last couple of weeks I've been starting out as a newbie learning a b…
... when a player leaves the screen, the xy distance between computer ... sprite is following you from screen to screen. May put up a ... about to arrive in the screen. For simplicity this is ... computer sprite home in using x - y calculations at maze intersections where ...Up/Down Left/Right scrollCan anybody give a newbie some pointer to simple one char scrolling by pixel? I've looked at a lot of resources, but as you can imagine, it's all a …
... can address it as an x/y plane like a sheet of ... :
1- Given the x,y coordinate figure out where in ... ; hl = display address for coord (x,y)
pop bc ; b = height ... characters
; hl' = screen address
; b' = pixel y rows remaining
Problem with a small basic routineDear all; I have been messing about with a routine (originally published in Your Computer 1982, by Tim Langdell). The idea of the program is to simul…
... along the bottom of the screen.
Put me out ... BORDER 1
20 FOR X=-100 TO 100
30 ... (SQR((10^4) – X*X)/R)
50 FOR Y=V TO –V ... (80+30*SIN((SQR(X*X+Y*Y))/12)-.7*Y)
70 IF ZArcade Game Designer 2.0 releasedI know dozens of you downloaded the previous version of AGD. Well, you can put it away now because I've made some major improvements to that version…
... still need to check blocks' x;y and try to correlate the ... to support 12 sprites on screen at 25 frames per second ...Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…
... and move it onto the screen... I?ll be happy! Hehe ... write the same on the screen line below. Then add a ... , etc.
The Speccy screen layout is a bit awkward ... later to convert X/Y coords to a screen address and shift-offset ...Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…
... write the same on the screen line below. Then add a ... , etc.
The Speccy screen layout is a bit awkward ... later to convert X/Y coords to a screen address and shift-offset ...Using ATTR detection in machine codeIs there a ROM routine that can be called that reads the ATTR value of a co-ordinate?
... that would convert an x,y into a screen attribute address (others on ... with different registers pointing at x,y for different udgs
ld ... ;call this routine to convert x,y from horiz & vert coord ... ,23 the max values for x,y
vertical_coord defb 16< ...Words of adviceHi all This is my first post on World of Spectrum and I'm gradually starting to discover the wonders of the machine. Just to give you a bit of bac…
... was a speccy running (small screen, 16 colours) but ran like ... also got an overhaul - the "screen" can be any size, and ... the MOVE parameter - PRINT MOVE x,y;"Hello!" will output at any ...
