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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…
... what I guess is a screen address calculation problem.
I ... need to calculate the screen address of a tile based on ... I have tile 0 its address would be 16384, tile 1 ... to calculate for the other screen thirds.
Could someone ... -
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…
... to convert a screen address to an attribute cell address...
... ; get the high byte of screen address
rra ; divide h ... ; de now contains the attribute address
[/CODE]
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;…
... system variable to extrac the screen address for a PRINT position.
Smooth Screen Scrolling RoutineHi everyone, this is a follow up to the thread on smooth screen scrolling. As promised here is the code for the routine. It's pretty long and fairl…
... /> SCRMODA LD DE,16388 ;screen address of top left
; ... /> LD BC,1760 ;adjust screen address for
SBC HL,BC ... /> ;HL=screen addr.
;DE=address of tile graphics ... /> EX DE,HL ;DE = SCREEN ADDRESS AGAIN
SKIPB ...Help required to calculate screen addressesDoes anyone have some code that calculates the screen address one pixel below the given address ? Is it best to use a lookup table ? Any examples of …
Does anyone have some code that calculates the screen address one pixel below the given address ? Is it best to use a lookup table ? Any examples of this.Optimisation Needed! Is this the Fastest way to copy bytes from screen and back again?I have the screen address (say 0,0 i.e 16384) I want to copy 4 bytes wide by 32 bytes high from the screen to an area of memory. I then want to cop…
I have the screen address (say 0,0 i. ... (4433 TStates to copy from screen to store)
; Clear the screen to show we are bringing ... ; Copy from store to the screen
ld hl, ...Help with calculating screen addresses[SIZE=3][FONT=Calibri]I?m having a bit of a coding session whilst at work so can?t spend too much time on my current problem. I?m sure someone on thi…
... just inc or dec the screen address by one. Up and down ... to cross one of the screen thirds. Assuming my cursor starts ...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…
... />
I have a bitmap screen address in DL, character aligned (the ... address of the top byte of ... the corresponding attribute address fiddling with that bitmap address?
I ...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 …
... the low byte of the screen address.
Finally, ... will give us our vertical screen address. From there we take ... a routine which returns a screen address for (ycoord, xcoord) in ...
X (xcoord) = 2
Screen Address = 20482
...Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... Buffer (DB) or 'Back Screen' to draw all the ... onto the main display screen. This allows me to ... />
The DB screen sits at mem 25000d and ... hl, 25000 ;Start of DB Screen
ld de, 16384 ... d $40/$48/$50 for screen address
ld a,(cline) ...Spectrum Screen RAM layoutHi there The spectrum screen layout is rather odd. It seems to be arranged into 3 256 byte groups. If I have an x (horizontal) coordinate (from…
... there
The spectrum screen layout is rather odd. It ... BASIC) to generate the appropriate screen address?
I'll see ...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…
... could maybe be adapted for screen addressing, or may trigger any ... ;)
Lets say that screen address is composed of:
AA instead of BBB... here is ...Timex Sinclair 2068Hi guys. This is my first post here, the first of many, I hope.. :) I have a Timex Sinclair 2068 but don?t know much about it. It was given as a gif…
[QUOTE=na_th_an]AA: What would be the ... sprite functions accept the absolute address for frame graphics now ... small difference in the graphic address specified during sp1_CreateSpr() and ... 2nd display file and the screen address stored in the struct_sp1_update ...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…
... \x14\xAA set attribute to AA
// \x01 set center ... zx_cyx2saddr(prow, pcol++); // destination screen address for char
if (attr ... = attr; // colour char on screen
for ( ...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…
... /> // \x14\xAA set attribute to AA
// \x01 set center flag ... screen address from pixel coordinates, screen address from column coordinates, attribute address from screen address, screen address from attribute address ...melbourne drawIt could be said I am easly pleased,:grin: Very nice peice of software. I was realy impressed by its ease of use. I think a lot of time and effort w…
... for the screen. It then sets HL to the address of the ... by setting ORG to that address and assembling it, but that ... followed by a SCREEN$ token ($aa). (Note that the SAVE address in the ... RET address.) That would give you all the pictures in SCREEN$ files ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
... ADDRESS fdb * ;current address is load address
EXECADD fdb * ;current address is execute address ... value (EOF) munus current address
;****************************
< ... ; point screen to $8000 + row (base screen address + row)
Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…
... 10101010 or &AA
62001 LD A,$AA ; Load A with ... bit pattern $3E $AA
62003 LD (62000),A ... HL,$4000 ; Load HL with screen address $21 $00 $40
62009 ...
62017 INC L ; Next screen byte $2C
62018 DJNZ ...Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…
... $3E $AA
62003 LD HL,$4000 ; Load HL with screen address $21 ... ; POKE bit pattern in to screen memory $77
62009 INC ... L ; Next screen byte (256 iterations) $2C
screen!
Only taken ...Must be missing the point - machine code... Hi Folks, Trying my hand at machine code again but falling at the first hurdle. I hand crafted the following to run at address 62000 and the co…
... $3E $AA
62003 LD HL,$4000 ; Load HL with screen address $21 ... /> 62009 INC L ; Next screen byte (256 iterations) $2C
62011 INC L ; Next screen byte (256 iterations) $2C
62013 INC L ; Next screen byte (256 iterations) $2C
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... checkerboard: db #55, #AA, #55, #AA, #55, #AA, #55, #AA
; ... ; e = low byte of screen address
inc hl ; hl ... screen address
ld d, (hl) ; d = high byte of screen address ...
ex de, hl ; hl = screen address of ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... checkerboard: db #55, #AA, #55, #AA, #55, #AA, #55, #AA
; ... ; e = low byte of screen address
inc hl ; hl ... screen address
ld d, (hl) ; d = high byte of screen address ...
ex de, hl ; hl = screen address of ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... checkerboard: db #55, #AA, #55, #AA, #55, #AA, #55, #AA
; ... ; e = low byte of screen address
inc hl ; hl ... screen address
ld d, (hl) ; d = high byte of screen address ...
ex de, hl ; hl = screen address of ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... ; e = low byte of screen address
inc hl ; hl ... screen address
ld d, (hl) ; d = high byte of screen address ...
ex de, hl ; hl = screen address of ... checkerboard: db #55, #AA, #55, #AA, #55, #AA, #55, #AA
[/code]
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... section
ALIGN 256
; screen address table. This must be 256 ... checkerboard db #55, #AA, #55, #AA, #55, #AA, #55, #AA
empty_box db #FF ... #55, #55
border_right db #AA, #AA, #AA, #AA, #AA, #AA, #AA, #AA
border_topL db #00, #7F ...
