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Writing to the screen from a bufferI?m designing a game and am spending a bit of time trying different ideas before I commit my self. I?m currently thinking of writing data to a buffer…
... ?back buffer? to the screen. Can the whole screen be drawn from the buffer without flicker ... ? If not, what is the ... -
printing to the screen using pokei remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyon…
i remember there being a way to print to the screen using pokes, which would allow you to print a character anywhere in the 175x255 matrix. can anyone remember? -
How to get Grahics to wrap vertically around the screen?I am using the following code to draw an image to the screen. First I use HL to contain ROW and COLUM I then call the MapScreenFunction As I draw m…
I am using the following code to draw an image to the screen.
... First I use HL to contain ... = display address
MapScreenAddress:
push de
ld a,l ... br /> ld l,a
pop de
ret
... -
Push/Pop data copyingWe all know that stack pointer cheese and push/pop is faster to move data than LDIR - which in turn is slower than unrolled LDI's anyway. I rewrote …
... the mojon's fourspriter to use push/pop, but copying a four character sprite to the screen ... takes three cycles of push/pop ... .
What's the ... -
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…
... of the screen down and then using the method as in Cobra to pop ... 8 bytes from the graphics, and use ... of self modified level code to push these to the screen.
It is ...
pop af ;
pop bc ;
pop hl ;
pop de ;
Xenon TriOxide (Xeo3)I just wanted you all to know that a new cross platform game has started development (well the +4 version has been around a while, but my colleague f…
... additional overhead, while the push technique to the screen is limiting (on the number of tiles ... ) it completely redraws the ... scrolling area allowing sprites to just be blatted ...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…
... bytes to "store", Then one to bring it back to the screen
di
push iy
; ... call copy2screen
pop iy
ei< ...Using the stack to blit bufferI was using a ldir to blit my back buffer to the screen RAM, and it was working pretty well if not rather slow. After reading about using the stack …
... using a ldir to blit my back buffer to the screen RAM, and it ... /> After reading about using the stack to push and pop stuff to the screen, I gave it ... byte wide lines from memory to the screen.
Can anybody give ...Rainbow Generator for 48K Spectrum using PUSHThis is what I came up with from [B]gasman[/B]'s suggestions. It's stable in ZXSpin and ZX32 simulating a 48K Speccy. Anyone like to try it on the …
... )+(128*char_row) ;Set the stack pointer to the data
pop af ;Scoop up ... /> pop hl
ld sp,22552+(32*char_row) ;Set the stack pointer to the screen ...
push hl ;Write 8 bytes ...Trouble with rainbow effect push/popI'm having a bit of bother getting my rainbow graphics to behave themselves. Basically I want a rainbow effect to last for say 4 seconds before movi…
... effect to last for say 4 seconds before moving on to the next ... part of the routine, the problem is if I omit push and pop ... bc the thing ...Fast way to clear the screen ?So I was wondering fastest way to clear the screen. I've tried this and this works but is it better than CLS ? LD HL,16384 LD BC, 6144 Loop…
... I was wondering fastest way to clear the screen.
I've ... , Loop
RET
To get rid of flickering my ... is that I still have to use double buffering or something ...Printing text using direct screen addressingHaving some problems printing using the FASE engine which is currently defeating me. Hoping to have someone clear out the bit of fog currently dwell…
... defeating me. Hoping to have someone clear out the bit of fog ... function. I'm trying to get the text working properly in 128k ... sprite movement.
According to the help document @ https://github.com ...Retro Games for Mobile Platforms: Uztek Games Brings Nodes of Yesod to the Pocket PCLockwood, Calif. -- Aug.26, 2003 -- Uztek Games today announced the imminent release of Nodes of Yesod for the Pocket PC -- the first of their retro …
... has enhanced the title with an easy guided installation, screen-rotate, and ... save game features.
"If you miss the ... an injection of classic fun to the emerging mobile platforms," said industry ...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 …
... LD B,A
PUSH HL
PUSH BC
DRAWBEG ; ... byte in row to the screen.
INC HL
POP BC
... sprite.
DRAWEND
PUSH BC
EXX
...Machine Code Sprites Example Code Using Char Based SystemBelow is my WIP code to do smooth screen wrapping sprites using char positions and offsets, as opposed to writing direct to a line (0-191) and shifti…
... for the total number of sprites
Spriteloop:
PUSH ... /> ADD IX,DE
POP BC
DJNZ Spriteloop ... /> ; Print a 1*8 char to the screen
; On Entry:< ...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 AF
PUSH BC
PUSH HL
PUSH IX
POP IX
POP HL
POP BC
POP AF
to the screen
; On ...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 …
... /> PUSH AF
PUSH BC
PUSH HL
PUSH IX< ... /> POP IX
POP HL
POP BC
POP AF
TO THE SCREEN
; ON ...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 …
... /> POP BC
LD SP,HL
PUSH BC
PUSH DE
PUSH ... /> ; PRINT A 1*8 CHAR TO THE SCREEN
; ON ENTRY:
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.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…
... /> push hl ; save font address
; convert the row to the base screen address ... the offset to the routine
pop af ; restore column carry flag
pop ...Port Chuzzle Deluxe for Windows to the ZX Spectrum?Hi all, I've been looking around for a Commodore 64 or ZX Spectrum game that's very similar to a Windows game called "Chuzzle Deluxe", but haven't b…
... . You can read all about the game here - [url]http ... thread who would like to port Chuzzle to the Spectrum, please let ... totally helpless!
To avoid copyright violation, maybe it ... idea if the game was renamed to something like "Pop Goes The Furball" ...Disabling scroll? at the bottom of the screen.Everyone must have written something similar to: 10 PRINT "HELLO" 20 GO TO 10 at some point in their lives. But when you get to the bottom of the s…
... must have written something similar to:
10 PRINT "HELLO ... "
20 GO TO 10
at some ... . But when you get to the bottom of the screen area in Sinclair BASIC ... , it asks you if you want to ...New for 2009 - mc onelinersI found the limit of one line and one screen's worth of program really useful in (re-)learning BASIC, so I've decided to carry the format over into m…
... posn
pop hl ;retrieve road posn
push hl ;save ... dec hl
newroadposn
push hl ;save road posn
to score
push bc ;save score
to learn how to do and add to the game is to time the write to the screen so the ..."This is a screensaver that do not save the screen"Which was a quote from the first release of SCREEN$ back in April 2001. Little did he know that, against the best judgement of myself and my peers, I…
... /SCREEN.zip[/url]
Unpack the SCREEN$.scr file and the "scr" folder to ... configuration:
SCREEN$ has possibly the nicest Speccy screen you will ever ... see, and that's thanks to ...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…
... for the first two thirds of the screen. It ... 's basicly the same ... /> ; And then point to the next cell
inc ... pop de
; And just draw 8 bytes to the screen:
push ...How feasible is it to add a second CPU to the ZX Spectrum?Today with IDE, and USB, and TCP/IP and other wonderful technologies arriving on the ZX Spectrum, I'm beginning to wonder if we'll run out of CPU tim…
... (i.e. jump to the address), and the other values can have ... So, if you want to write to the memory of CPU1, then simply ... very short program onto CPU1 to copy the screen memory, and voila, we ... SMP needs both processors to have access to the same memory. So, if ...SP and IM2 woesI have a function that writes the backbuffer to the screen using the method by which SP is stored, I "POP" a load of registers and then chnge SP to t…
... the backbuffer to the screen using the method by which SP is stored, I "POP ... " a load of registers and then chnge SP to the screen and "PUSH" ... soon as I Enable the IM2 interrupt, the screen gets corrupt (All ... takes a few cycles to do the copy of GFX.
Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …
... time is how to paint a squared zone of the screen with some ... color.
The zone must be ... want to paint with blue color the into.
the way to ... 2...
call $1601 ;to print in the screen
...Backpackers Guide to The Universe - Part 1Afternoon all, I'm currently putting together a web site devoted to Fantasy Software - detailing their short history, releases, press releases, unre…
... went wrong with The Backpackers Guide to the Universe, Part 1 ... mentioned above), the controls are terrible (compared to the lovely control ... The Pyramid and Doomsday Castle), and your stats screen ... how far Backpackers Guide to the Universe 2 Super Pyramid ...Hacking the O.C.P Full Screen Editor/AssemblerIf you have been reading my posts recently then you will know that I am eager to have the sourcecode I wrote for the Spectrum during the period 1988 …
... adding a new command to copy the object code to the screen (location 16384) so ... I could simply snapshot the code ... just assembled to a screen dump of 6912 BYTES. As the Spectrum only ...
