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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…
...
; convert row -> offset of row in screentable (= tbl_scraddr + row*16)
; look up screen address from the table
ld ...
; convert row -> offset of row in screentable (= tbl_scraddr + row*16)
Help needed with drawing masked spriteI need to draw a small sprite (16 bytes) on to the screen using a mask. Its the only sprite that will be used so speed isn't too important. I was goi…
... 16 bytes) on to the screen using a mask. Its the ... a small area of the screen (based on the sprite ... draw the sprite to the screen using the mask. On ... the next screen update I would erase the ... had moved to a different screen address then draw the sprite ...TOP 10 information that a speccyfan must knowI'm trying to write another article about speccy in a local scene magazine, and I need your help (again). Can you post your opinions about "very imp…
... user?
eg.
Screen address starts from 16384.
zx ...mea culpa!I have just sent Digital Prawn another entry for CCG 2008 which might shock a few people! It is a program which emulates a Commodore Vic 20 - yes, yo…
... tricky though, and the 25 row screen is just that bit too ...Fastest Block Drawing Code?Following on from my scrolling thread [URL="http://www.worldofspectrum.org/forums/showthread.php?p=351304#post351304"](http://www.worldofspectrum.org…
... in order to scroll the screen.
Now I am ... ) to the screen.
Assuming HL holds the address of the ... Block, and DE holds the screen address, does anyone have an example ... to BLIT this to the screen as quickly as possible?Tips on optimizing some newbie assembly routinesI'm starting to learn some assembly language. The best way to learn is to actually code something you are going to use, so I'm creating a very simple…
... />
; This address is calculated by:
; ...
; Next character screen address:
pop de
... we just start on another screen address:
ld ...Z80 Machine Code Question...Hi Folks, I know not strictly a BASIC question but I have started to learn Z80 machine code - 25 years too late! :smile: I have been reading a book…
... is intended to paint the screen black (nothing complex) and looks ... is FFh in the first screen address i.e. it seems that ...Optimization for this codeHello, I have done and submitted a small program for the CSS Crap Game Compo which involves a machine code routine. The z80 with BASIC and MC is av…
... /> ; above to get the correct screen address into HL
; did not ...Getting the contents of tablesHi All, I'm risking a potentially daft question here as it seems pretty fundamental but here goes: What's the best way of pointing register pairs a…
... with hl pointing at a screen address and de at the graphic ...Moving a line down the display in assembler?...It's not a "[I]how can I do it[/I]" question, it's more a "am I missing something in trying to do it a new way" kinda question. What I've been doing…
... , how do I get a screen address from that. It seems easy ... code and you get the screen address in HL.
[CODE ...40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... with hl pointing at the screen address
ld de, ... shift, then AND with screen contents
ld b ... hl pointing at the screen address
ld de, ... character before printing to screen
defb 0, ...Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... memory into its own screen buffer and generates a ... -read from an alternative address, so that it could ... reads to the ROM address space, and treat them ... able to place its screen address at least on any ... the ROM and lower 16K address spaces. (That the ROM ...Drawing some spritesI figured I want to draw some sprites. My target was to do a 16x16 masked sprite. There's no clearing here, just drawing the sprites. My first ite…
... /> ld a, (de) ; load pixel from screen
and (hl) ; and the ... /> ld (de),a ; put modified pixel to screen
inc hl ; increment ... ), a ; plot pixel to screen
inc hl ; increment screen ptr
< ...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 ... /> INC E ; ADD 256 TO SCREEN ADDRESS TO GET TO NEXT LINE ... TO ADD TO THE MAP ADDRESS
ADD HL,BC ; ... ADD 32 TO THE MAP ADDRESS TO GET TO THE NEXT ... out how to get the address of the next character ...Function with push and popIm trying to see if I understand push and pop when it comes to using to pass parameters to functions: [code] LD HL,16384 LD A,5 Push AF Ld A…
... of the add function to screen address 16386
its always zero ...what is wrong with this loop?here is the loop: ld b,12 ld a,31 ld de,right_screen_array right_screen_array_label call charaddress ex de,hl ;de now contains screen address…
... de,hl ;de now contains screen address hl contains array location
screen,
the charaddress function works ...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?Fighting Warrior's protection systemThis is one of those bizarre cases where cracking the loading system is orders of magnitude more fun than playing the game. (Indeed, discovering I wa…
... bytes off tape for a screen address, then 8 bytes for that ... the attribute. This allows the screen to be drawn in a ... .
3) After the screen is loaded, the remaining bytes ... takes the code hidden on screen, puts in the top of ...line routineWondered if anyone can help me out. I have been programming a 3d graphics library for the spectrum, in Machine code. The line routine that I have i…
... />
; ******************************************************************
;
; Get absolute pixel address in map of virtual (x ... ,x) coordinate of pixel
; out: de = address of pixel byte
; a ...help with sprites from SevenUpHas anybody got source for a short m/c rountine that can send sprites designed in SevenUp to the screen or to a dummy screen? A long time ago, I wor…
... /> The way the Spectrum's screen layout is divided into thirds ... determine which third of the screen you're dealing with, usually ... the high byte of your screen address - 16384, 18432 or 20480 ...need help with speed optimization. this procedure draws a sprite with mask from memory onto the screen with x-coordinate in pixels. it doesn't shift sprites in realtime, it just uses …
... to store and retrieve the screen address each line.
DerekIM2 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] ; ***********…
... > 2) Embed the sprite address into it's table and ... status changes. Updating the address during the movement is usually ... you mean. I dont calculate screen addresses, these are read ... you mean, only recalcluate the screen address when the sprite moves?
Amstrad CPC Emulator?After reading a favourable comment on one of the other threads, I fancy having a look at what the CPC had to offer, since I've never really had the c…
... need hardware sprites in those pixel-colour screen modes. THere's just ...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 …
... the "Routine to generate a Screen Address Table". I had to change ...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…
... the low byte of the screen address you need to preserve for ...Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
... want the attr address and have the screen address the code is very ... simple:
; Get Attribute Address ... /> ;
; enter: hl = screen address
; exit : de = address of attribute square
Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
... you want the attr address and have the screen address the code is ... very simple:
; Get Attribute Address ... /> ;
; enter: hl = screen address
; exit : de = address of attribute square
Convert x,y to Attribute Address in AssemblyWhat is the fastest way, given x,y (in hl) to return the attribute address?
... assumption that HL contains the screen address, but as the poster originally ... a routine to calculate the screen address from the XY coord (again ...128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…
... always have 49152 as the screen address?
I have ... /> call PageRam ; effects the flipped screen
ld a,( ... />
; hl = screen address
; de = gfx
