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Pixelwise scrolling sideways - how many ways to do it?Not that I need to, but I've been wondering if there's a good way to do this that I haven't considered. Scrolling [B]pixelwise [/B]vertically is "ea…
... ; or scrolling, then copying, a back buffer. If you have a few ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... RAM for IM2 table, stack, back buffer etc. This is set up ... -
How to safely maximise available memoryHi All, I'm toying with an idea that will require I have as much memory available as possible. I'm a little embarrassed I have to ask this tbh. As…
... RAM for IM2 table, stack, back buffer etc. This is set up ... -
3D Deathchase on the Commodore 643D Deathchase has been ported to the C64, at least according to Micro-Mart. According to this week's MM, the port is called Hell Racer, and here's a …
... /> You could also have a back buffer, but I'm not sure ... -
GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…
... all object redraws drop straight back out without doing anything at ... if one would use screen back buffer, draw bottom windows first, top ... -
GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…
... if one would use screen back buffer, draw bottom windows first, top ... desktop forward, without using any back-buffers. The method I adopted ... 's position, then draw the back window, applying (yet) more ... the mask as we travel back through the windows, I also ... -
64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... tasks to draw to a back-buffer. The mode has a ... display) and a background buffer (the target buffer for drawing). The ... foreground buffer is drawn until the background buffer is ready ... to draw to the background buffer. Without this speedup, the ... -
What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…
... . Ritman uses a variable size buffer to do this, up to ... have a back buffer screen. That 256 bute buffer *is* his back buffer! Tremendously efficient ... those intersection calculations) but gains back speed by having lots of ... -
What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…
... Ritman uses a variable size buffer to do this, up to ... have a back buffer screen. That 256 bute buffer *is* his back buffer! Tremendously efficient ... those intersection calculations) but gains back speed by having lots of ... problem is that takes a buffer very long -
Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... memory for a second screen buffer so it can be done ... 't necessary to rebuild the back buffer from scratch each time; just ... copying the front buffer with a one byte offset ... -
Machine code optimisationI'm geting back into z80 coding and wonder what the best way of showing how efficient the code is. I've got Rodney Zaks book and see there are timin…
... =rune;721374]I'm geting back into z80 coding and wonder ... don't bother using a back-buffer). One efficiency to keep in ... -
Another vertical scrolling questionwhile talking about w256 x h128 vertical scrolling, are 128k modes have any advantages over 48k models? has extra ram or swappable screen buffer any…
... 's swappable screens as a back buffer is that you have to ... -
Another vertical scrolling questionwhile talking about w256 x h128 vertical scrolling, are 128k modes have any advantages over 48k models? has extra ram or swappable screen buffer any…
... 's swappable screens as a back buffer is that you have to ... the obvious buffer advantage.
(/me goes back to crappy 48k ... -
Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... me of my byte-order back buffer. Although I suspect that could ... -
FZX Driver for z88dkAn fzx library for z88dk can be downloaded [URL="https://drive.google.com/file/d/0B6XhJJ33xpOWM2hWNjAxMVkxaEk/edit?usp=sharing"]here[/URL]. The libr…
... copy fzx text into a back buffer and then make that part ... -
FZX Driver for z88dkAn fzx library for z88dk can be downloaded [URL="https://drive.google.com/file/d/0B6XhJJ33xpOWM2hWNjAxMVkxaEk/edit?usp=sharing"]here[/URL]. The libr…
... copy fzx text into a back buffer and then make that part ... -
Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... machines) and although a 128 back buffer method will work on those ... -
Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... machines) and although a 128 back buffer method will work on those ... -
Small demo to show my sprite engine for ZX Spectrum 48KThis demo shows 13 sprites moving at 50fps totally flicker free: 12 enemies bouncing in edges and the main character, controllable with OPSA (note S …
... machines) and although a 128 back buffer method will work on those ... -
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 …
... masked sprite version to a back buffer.
I know Joffa ... -
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 …
... the advice here my blit/back buffer routine is working really great ... quick way of destroying the back buffer image would be? My routine ... /> move stuff
draw to buffer
blit to screen
wipe buffer for next pass
quick RAM copy using LET in BASICI'm in the process of reviewing, revising and refining all the programming tips & utility routines which I've posted on this forum over the last eigh…
...
Address 60000 are my "back buffer" and have 160 bytes long ... 64440 (level 1) to 60000 (back buffer). 160 bytes.
3- ... " if dir origen and dir back buffer are different. ;-)
...< ... bytes of data map to back buffer data map.
...ZX Alien Breed - WIPI'm sure a lot of you have seen the discussion in the New Game Ideas area about a Speccy version of the classic Amiga game Alien Breed. I've been dro…
impressive progress,
are you using the stack to copy bytes from the backbuffer to the screen?
do you blank the back buffer every frame then draw sprites on to it?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…
... obvious reasons.
The back buffer screen is stored at ... Editor)
;
; Transfer back buffer screen to main spectrum screen ...
;
; The back buffer screen is at 32768
back now, :)
dec d ...128K shadow screen?Hi How does the shadow screen feature work , and how can it be used?
... the alternate screen as a back-buffer, you page it in at ...Buffer to screen - how much?[FONT=Calibri][SIZE=3]I am starting to build a new game and am researching different ways to accomplish what I need to do. My question is, is it poss…
I've come to the conclusion that the only back buffer worth using is one where you can write to it while displaying the other screen, as per the Timex and 128. There are better things to do with CPU time on a 48K machine.Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…
... 't use any kind of back-buffer.
It worked something ...Screen buffer Tip from Raff CeccoRaff very kindly gave me this tip: "Incidentally, I remembered a trick I used on the Z80 for extra speed: When clearing the screen buffer, it was a…
... 't use any kind of back-buffer.[/QUOTE]
See, this ...SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…
... that writing to a back buffer was the only way ... the entire map graphics to buffer screen,
draw ... ORing/ANDing sprites on buffer screen,
draw ... tile values from the buffer back to the map in ...
The back buffer has now gone, the game ...SpritesYes yes, I know this has been hashed over plenty of times before, but... I have knocked up a quick tiling routine which works with my back buffer co…
... that writing to a back buffer was the only way ... the entire map graphics to buffer screen,
draw ... ORing/ANDing sprites on buffer screen,
draw ... tile values from the buffer back to the map in ...
The back buffer has now gone, the game ...
