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Calculating screen address to alternative ATTR area?I'm using this small snippet of code to convert a screen address to an attribute cell address... [CODE]AttrDE: ld a, d ; get the hig…
... snippet of code to convert a screen address to an attribute cell address...
screen address
rra ; divide h by ... ]OR 0xFD[/B] to get me the address of an ATTR cell ... -
Map to screen address problemCan anyone help me out with what I guess is a screen address calculation problem. I need to calculate the screen address of a tile based on a number…
... a screen address calculation problem.
I need to calculate the screen address of ... a tile based on a number from 0 to ... I have tile 0 its address would be 16384, tile ... when I have to calculate for the other screen thirds.
... -
Loading a screen in to memory...Hi Folks, I want to load a SCREEN$ in to memory and save it out to RAM disk without it being displayed on the screen. I am worried about over writi…
... to load a SCREEN$ in to memory and save it out to ...
[CODE]100 LOAD “SCREEN” CODE RAMTOP+1,6192
110 SAVE !”SCREEN” CODE RAMTOP+1,6192 ... /> Where RAMTOP is the address held in the equivalent System ... a simple [B]LOAD!"SCREEN" SCREEN$[/B] or does the ... -
bitmap address to attribute addressI've searched, but I don't seem to find the proper keywords. I have a bitmap screen address in DL, character aligned (the address of the top byte of…
... to find the proper keywords.
I have a bitmap screen address ... in DL, character aligned (the address of the ... a quick way to get the corresponding attribute address fiddling with that ... -
Screen address of PRINT position...Hi Folks, The following code uses DF CC system variable to extrac the screen address for a PRINT position. [code]100 CLS 110 PRINT AT 10,16;…
... DF CC system variable to extrac the screen address for a PRINT position ... /> I was expecting the bar to appear at the top of ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... copied to buffer
b) Sprites drawn on buffer
c) Buffer copied to screen
This is to be ... br />
; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
LD A,H ... -
Smooth Masked Sprites using fast page flip on 48k Part 2Ok, After all the suggestions in Part 1, which were all excellent (Thankyou), I opted on the following: I have 2 x 6k Offscreen areas (Yes, that's …
... /> COPY BACKGROUND TO BUFFER
MOVE AND DRAW SPRITES TO BUFFER
SET UPDATED ... FLAG TO 1
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... INITIM2
; Fill Back buffer with a bright stripy pattern ...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... INITIM2
; Fill Back buffer with a bright stripy pattern ...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H ... -
Smooth Color Masked Sprites using fast page flip on 48kHere is a quick demo of using char based sprites using the Page flip method: a) Background is copied to buffer b) Sprites drawn on buffer c) Buffer …
... INITIM2
; Fill Back buffer with a bright stripy pattern ...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... to print
// buf = destination address for printed bitmap (screen or buffer)< ... br /> // f = uchar *(*f)(uchar *)
// adjusts destination address to ... formula will have to be applied to the screen address to move down ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... a dirty buffer. Instead of copying the whole screen each time ... screen address and you need cpu cycles to compute the next screen address to draw to ... engine reduces the double buffer to just 8 bytes (one ... copying the 8-byte buffer to screen is small, tearing is ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... screen address and you need cpu cycles to compute the next screen address to draw to ... engine reduces the double buffer to just 8 bytes (one ... the character into that buffer. Only when the completed ... in copying the 8-byte buffer to screen is small, tearing is ... -
50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... ; Copy 15 byte buffer from level to buffer
ld de,buffer ;
ldi ... ,(spstore2) ; Load screen address to push to
; Self modified push to screen
buffer: defs 15 ... ;
;
ld hl,sp ; Move to ... -
Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... ld hl,16384 ;screen address
ld de,35000 ;address of graphic loaded ... h ;down one row on screen address
inc de ; ... characters to move to right
ld hl,16384 ;screen address to start ... into h (high byte of screen address)
ld ... -
Problem with BC corrupting after DJNZJust for fun, I'm messing around trying to get the level maps from Lemmings to display on the screen with machine code. It's been ages since I did an…
... the screen I have to add 32 to the map address to get to ... the next line.
To ... INC E ; ADD 256 TO SCREEN ADDRESS TO GET TO NEXT LINE
LD ... ; ADD 32 TO THE MAP ADDRESS TO GET TO THE NEXT LINE ... -
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... char to the screen
; On Entry:
; HL Contains Screen Address
; converts a screen address to an attribute address
; on entry: de = screen address
; on ... -
IM2 Machine Code Sprites Example Code Using Char Based SystemFurther to my earlier post, here are sprites running using char method with IM2 driving it Note, for 48k spectrum using TASM [code] ; ***********…
... HL
; converts a screen address to an attribute address
ld a ... /> ; converts a screen address to an attribute address
; on entry: de = screen address
; on ... -
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…
... ; converts a screen address to an attribute address
; on entry: de = screen address
; ... af
; generate screen address without using tables :)
; store ... the sprite data to display.
; de = screen address to draw at.
Getting attribute location from a screen coordinates (x,y)I am having trouble figuring out how to convert an x,y coordinate pair (pointing to a specific pixel) to the location of the attribute for the block …
... To convert a screen address to an attribute address, you want to go from #1 to ... Computes the attribute address corresponding to a screen
; address such as returned by ... /> ; enter: hl = screen address
; exit : hl = address of attribute square
Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... hl,16384 ;screen address
ld de,35000 ;address of graphic loaded ... h ;down one row on screen address
inc de ; ... characters to move to right
ld hl,16384 ;screen address to start ... of screen address)
ld b,8 ;reset b to ...Comments for small "sprite" routine wantedI have just written my first machine code program and I am quite happy (and proud) to get it working! :smile: As a child I never learned anything e…
... ld hl,16384 ;screen address
ld de,35000 ;address of graphic loaded ... h ;down one row on screen address
inc de ; ... characters to move to right
ld hl,16384 ;screen address to start ... into h (high byte of screen address)
dec ...Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... br />
According to [url=http://www.worldofspectrum.org ... way to write to screen is to move the SP to the ... to scroll the Spectrum screen.[/b]
[code]DW graphic, screen address 1, screen ... br /> POP DE ; get screen address to dump it at
...Maps in progressIf you are working on some map, this thread is just for you! Post here the name of that game for which you are creating a map. Only then we can preve…
Can I ask a question? Do you map a game by playing it through fully, or do you hack a "current screen" address to move between screens?Maps in progressIf you are working on some map, this thread is just for you! Post here the name of that game for which you are creating a map. Only then we can preve…
... do you hack a "current screen" address to move between screens?[/QUOTE]
Graphics problemHi guys. Finally got a REAL zx spectrum, cost ?20 from a friend. When i draw plots and circles, it takes time to do it, but how do i do it instantly…
... it is very quick to modify a screen address to move over by single ... where successive points are next to each other.
... any fast graphics library needs to be. It is not ideal ... it slower!!) and it computes screen addresses from pixel coordinates.50Hurts - Full-screen 50Hz 1-pixel scrolling on a 128K Speccy50Hurts - Full-screen 50Hz 1-pixel horizontal scrolling on a 128K Speccy. Graphics are an obvious nod to Joffa, whose games and banter were a big ins…
... loc_A1CC:
; go to the next screen line
; A ... contains the offset into the line address ...
; HL now holds screen$ address
byte_A1D8:
db ... /> ld sp,hl ; put screen address to SP
exx
...Newbie says 'Alreet?'Hiya dudes, Just dropping a line to say hello as i've decided at 33 to try and fulfill a long time ambition to write a speccy game in machine code..…
... test would be modifying a screen address to move down one pixel. As ... existing position represented by a screen address. The solution is below (hint ... screen address
9 ; exit : carry = moved off screen
10 ; hl = new screen address ...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 …
... de = current sprite graphic definition address (point to GGGGGGGG)
... to screen somehow maybe like this
; exx ; hl = current screen address ... MSB of the table address to use must be ... you fixing the screen address to write to by moving down ...
