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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 ... attribute address
or 0x58 ; set the high order byte to ... -
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 ... there a quick way to get the corresponding attribute address fiddling with that ... bitmap address?
I'd ... -
Z88DK NOOB cplot INK colorHi I am a complete NOOB with Z88DK, I am trying to draw colored circles. How does ink, paper and border work with Z88DK. I started trying to wo…
... ; hl = screen address
call asm_zx_saddr2aaddr
; hl = attribute address
zx_saddr2aaddr() stands for "screen address to attribute address".
zx_px2bitmask() stands for ... -
Reading DEFB for backgroundsHi all I suppose the question is kind of silly but I'm a completely newbie with assembler :-S I'm drawing some side backgrounds with ZX Paintbrus…
... of useful bits of code. Attribute address to screen address, and screen address to attribute address.
[code]aa2sa: ld ... -
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 ... -
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 ... -
Work out screen address from attribute cellAttribute cell 22529 is equivalent to PRINT 0,1 position value. Is it possible to obtain these two values from the number 22529 in a simple MC rou…
Attribute cell 22529 is equivalent to PRINT 0,1 position value.
Is it possible to obtain these two values from the number 22529 in a simple MC routine? -
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 …
...
; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
LD A,H
TO THE SCREEN
; ON ENTRY:
; HL CONTAINS SCREEN ADDRESS
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 …
...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H
TO THE SCREEN
; ON ENTRY:
; HL CONTAINS SCREEN ADDRESS
Speccy machine code info where is it?Recently I've been trying to learn Z80 and I've managed to make limited progress (some of my routines even compile now!) but I seem to be having trou…
... rearrangment for you to change from x,y coordinates to screen address and pixel ... that it is fastest to modify the screen address directly rather than constantly ... coordinates, screen address and attribute addresses. I'll leave that for you to work ...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
screen address to an attribute address
; on entry: de = screen address
; on exit : de = attr address ...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] ; ***********…
... /> PUSH HL
; converts a screen address to an attribute address
ld a ... screen address to an attribute address
; on entry: de = screen address
; on exit : de = attr address ...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 …
...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H
TO THE SCREEN
; ON ENTRY:
; HL CONTAINS SCREEN ADDRESS
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 …
...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H
TO THE SCREEN
; ON ENTRY:
; HL CONTAINS SCREEN ADDRESS
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 …
...
;
; ; CONVERTS A SCREEN ADDRESS TO AN ATTRIBUTE ADDRESS
; LD A,H
TO THE SCREEN
; ON ENTRY:
; HL CONTAINS SCREEN ADDRESS
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…
... screen address to an attribute address
; on entry: de = screen address
; on exit : de = attr address ... af
; generate screen address without using tables :)
; ... 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 ... ; enter: hl = screen address
; exit : hl = address of attribute square
; ...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…
... the screen address from pixel coordinates, screen address from column coordinates, attribute address from screen address, screen address from attribute address, ... a screen address and returns the address of the corresponding attribute square, to which ...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..…
... is converting character coordinates to an attribute address and to understand that you have ... square. The attribute address selects a char square but the screen address can select ... test would be modifying a screen address to move down one pixel. As ...PLOT and DRAW in machine codeHow do you go about it? If I posted a really simple BASIC instruction could someone do a machine code routine so I could learn from it? I wouldnt k…
... call PIX2SCR ; compute hl = screen address from pixel coordinates
to screen
ret ; note no change to attribute
... then be converted to a screen address using a ... should be modifying a screen address to move up, down, ...next pixelI searched the "Discussions" groups for the phrase "next pixel" and got no matches - and removing the quotes it discards the "next" and just searches…
... = screen address to pixel y coord
zx_saddrpup = screen address pixel up
zx_aaddr2saddr = attribute address to screen address
Tile routinesHi all, Please does anyone have any examples of tile routines in pure asm to set up maptile screens. I would like to try and understand them and ti…
... get_screen_location ; returns HL containing attribute co-ordinates on screen
; ... ; now get that screen address to be converted to the address of the attrs
to place the attribute colours for that tile ...Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... url]
Every screen address, attribute address, character and pixel coordinate manipulation ... view=markup"]asm_zx_saddr2px.asm[/URL] (screen address to pixel x)
[URL ... [/URL] (screen address to pixel y)
The screen address does not ...Column and row numbers to attr address?[FONT=Calibri][SIZE=3]Can anyone provide me with a code snippet the will convert the column and row numbers into the screen attribute address. For ex…
Every screen address and attribute address calculation you can ... B]x[/B] [B]to[/B] [B]a[/ ... col)
;
; Attribute address of character square at row ... /> ;
; exit : hl = attribute address corresponding to character
;
; uses ...Comp.Sys.Sinclair Crap Games Competition 2017As the creator of the second-least crap game in last year's competition (and the only mug stupid enough to agree to host it this year) I am proud/ash…
... works is at memory address 64000 there is space ... 63033[/b] to clear the buffered screen completely to attribute 0 (black ... an ATTR() read, the address to POKE or PEEK is [ ... 0' followed by an address and a count will ... '1' followed by an address and a count, then ...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 ...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 ...
