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LUMASCII - 4-level work-in-progess build...In case anybody wants to have a play... [URL="http://www.bobs-stuff.co.uk/extras/lumascii_4_level_wip_20120909.zip"]http://www.bobs-stuff.co.uk/extr…
... would you go to all that effort just to get that reaction ... much work in painting the screen as I would be if ... care.
Okay, you blit every character (that was changed ... amount of blits, I guess) to screen. But you dont need much ... -
Assembly game programming on ZX how-to?Hi. I'm planning to build and release new software for the Speccy but I'm pretty lame as to handle its hardware despite a good mastery of Z80 assembl…
... advice on how to do fast updates to the screen? Like drawing ... />
When drawing to buffer you can use as much ... When ready, you copy the buffer content to screen memory.
... can also organize buffer memory differently than screen memory so bytes ... -
Video generation using a CPUWe know it is possible to generate a video signal using a CPU, and this technique was often used on low-end computers in the early 1980's (for exampl…
... The GPU will render to a frame buffer, and dedicated logic ... is used to output the ... contents of the frame buffer to the screen. So a modern graphics ... to a frame buffer, and dedicated circuits that output the frame buffer to ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... -> 2K
[empty buffer to store current level or music ... decompress level 1 to the buffer. When player advances to next level, ... next level to the same buffer. When player returns to main ... to play the first time only (while still showing the loading screen ... -
RCS (Reverse Computer Screen)[B]RCS[/B] ("Reverse Computer Screen", or simply SCR written backwards) is a small utility I'm about to release, that reorders bytes from the ZX-Spec…
...
[*]Whenever you want to show this screen, you could first decompress ... back into a regular screen. However this method requires ... write it directly to the ZX-Spectrum screen.[/LIST]
... routine to transform RCS format back into a regular screen. The ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... now, that includes the RCS to screen conversion.
It ... used as a 6912 bytes buffer. To change this POKE loadaddress+ ... +18,128 would make the buffer 32768.
Edit1 ... zx7 decompressor with RCS conversion to screen routine.
Load your ... -
Bottom 4 lines of the screen fileI'm wanting to save the bottom 4 lines of the display memory (AT 20,0 to #0; AT 1,31) 23168 is the start of the attributes and its length will be 32…
... B,4 ; Number of screen char lines to save
SPRSLP1 PUSH ... B,4 ; Number of screen char lines to restore
RPRSLP4 PUSH ... defs 1024,$00 ; 1024 byte buffer for screen save
ATRBUF2 defs ... -
Keyboard TrickI know how to use the multi key in BASIC with IN you can get the keys [QUOTE]IN 254+256*(255-2^K)[/QUOTE] K is the keyboard's half row, comes from …
... /> PUSH HL ; Will return buffer position later
LD BC ... $ ; Set this to where you want the buffer to be.
;22528 ... screen with ink.[/code]
The offset in the buffer ... slightly longer routine, the buffer could order the keys ... -
MegaManZXMega Man for ZX Spectrum [center] [IMG]http://i45.tinypic.com/2ho90rd.gif[/IMG] [IMG]http://i49.tinypic.com/dzt7bd.png[/IMG] [IMG]http://i49.tinyp…
... stop abruptly. Not every screen would be cluttered with ... original. Except the character selection screen (the middle one) doesn ... sprites to a tile buffer and then render such buffer on screen. The ... the knowledge to create such graphical engine to be fast ... -
MegaManZXMega Man for ZX Spectrum [center] [IMG]http://i45.tinypic.com/2ho90rd.gif[/IMG] [IMG]http://i49.tinypic.com/dzt7bd.png[/IMG] [IMG]http://i49.tinyp…
... sprites to a tile buffer and then render such buffer on screen. The ... even 2/3 of the screen.[/QUOTE]
Hmmm... ... new engine called RetroBlocks (similar to CEZBlocks) might be good ... It can take the previous screen state into consideration and draw ... -
MegaManZXMega Man for ZX Spectrum [center] [IMG]http://i45.tinypic.com/2ho90rd.gif[/IMG] [IMG]http://i49.tinypic.com/dzt7bd.png[/IMG] [IMG]http://i49.tinyp…
... sprites to a tile buffer and then render such buffer on screen. The ... the knowledge to create such graphical engine to be fast ... even 2/3 of the screen.[/QUOTE]
... one before I run to the bathroom for my ... , and had always wanted to do. Will also look ... -
MegaManZXMega Man for ZX Spectrum [center] [IMG]http://i45.tinypic.com/2ho90rd.gif[/IMG] [IMG]http://i49.tinypic.com/dzt7bd.png[/IMG] [IMG]http://i49.tinyp…
... based sprites to a tile buffer and then render such buffer on screen. The ... have the knowledge to create such graphical engine to be fast enough ... even 2/3 of the screen.[/QUOTE]
Huh? I ... -
Fastest redraw of screen from UDGsHere's a question for everyone, to generate a bit of code to be used in games: On a standard 48K Spectrum, what's the fastest way to redraw the scre…
... of space in the frame buffer on screen addresses![/QUOTE]
to start/finish:
[CODE]start ... -
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…
... uses a variable size buffer to do this, up to 256 bytes, and ... does not have a back buffer screen. That ... 256 bute buffer *is* his back buffer! Tremendously efficient ... -
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…
... a variable size buffer to do this, up to 256 bytes, ... and does not have a back buffer screen. ... That 256 bute buffer *is* his back buffer! Tremendously ... that the routine has to draw. Calculates the ... that takes a buffer very long -
Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... :
tacts, lost due to contention in sp-1 -> tacts ... , lost due to contention in sp-2 -> overall ... . for random accessess to screen memory during the screen drawing using PUSH we ... 8=7.5 tacts of contention delays. Would you agree with ... -
Some thoughs about fast scrolling on 128 modelPlease, consider this article as technically interesting concept not a proven algorithm. ONE The fastest scrollers use long sequence of PUSH inst…
... />
tacts, lost due to contention in sp-1 -> tacts ... , lost due to contention in sp-2 -> ... for random accessess to screen memory during the screen drawing using PUSH ... estimate, because the actual contention delay is deterministic and ... -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... was making operations on linear screen buffer in memory. I didn't ... to real screen
N - are not directly copied to screen but deliver bits to ... width of my buffer line doesn't need to be 32 bytes ...
DI
LD HL,Buffer+256*14+255
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... an implementation of loader_advance_pointer to blit a loading screen (or at least ... RAM for an "instant" screen a la Speedlock, then ... a contrived example using a screen. First, the attributes are ... loaded off-screen, then blitted into video ...Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... I'm asking is to do with memory contention. If the byte ... likley, as the resulting contention is limited to 1 byte rather than ... 32K there will be no contention; the same if you ... driven routine to put these already scrolled pixel to screen, the contention won't ...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…
... /> has extra ram or swappable screen buffer any use on scrolling?[/QUOTE ... with screen sync are gone. And it is always better to copy ... and draw it to screen swapped off than trying to copy 4KB while ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... hl, 0xd800 ; start of character buffer to HL
add hl, de ...
jp po_scr_3 ; scroll the screen and return
; ... a, (de) ; first byte of screen to A
xor (hl) ; compare ...Nasty 'Gotcha' for multicolour timingI thought I would be better developing my multicolour routine on the 48K first, being the slowest, so it would then be sure to work on the 128K varia…
... multicolour from a buffer to the centre of the screen.
This ... colour data in the buffer is a pointer to the next line ... is processed, the buffer automatically wraps from bottom to top. Thus the ... A from a buffer after each row of colour to make sounds ...z88dk and im2I set up a minimal IM2 mode so I can draw sprites for a laff [code] #include <string.h> #include <stdio.h> #include <im2.h> #include <stdlib.h> #in…
... is a good way to time sprites to screen refresh? or is it ... into that 'wpoke'. Remember to save and restore any registers ... size screen 32x24
53 ; d1ff - d1ff SP1.LIB attribute buffer
buffer
55 ; d1ed - d1f6 ...Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... the early loading-screen demos I posted ... also have the printer buffer to use as scratch ... to retrofit 47loader to it as a tech demo to show to ... [B]David Jones[/B], with a view to convincing him to ... [quote]Anyway looking forward to using it with my ...Overclock the Z80 cpu to smooth out gameplay?Was thinking today of a Genesis/Megadrive mod I did a while back. It involved lifting the CLK leg on the motorola 68000 cpu (which in the MD, if I r…
... writes to screen. Contrast with the Pentagon which has no contention in shared ...Isometric GamesAs a longer term project I'm thinking of attempting an isometric game, along the lines of Alien8, but with Magic Knight. No promises though, because …
... might be a better way to do the going behind blocks ... things it might be quicker to mask the character sprite using ... above the 32K address space to avoid screen contention slowdown. It would also ... so far, but I need to be getting on with Finders ...Game loopJust working on my first ever Spectrum game, and am struggling to work out what the game-loop should look like. I've got interrupts enabled (mode 2)…
... on how you are drawing to the screen.
One thing ... completed graphics to a buffer and then copy the finished result to screen. sp1 ... example that draws completed graphics to screen one character square at a ...Pac-Land: can be coloured?All versions of this game are full coloured, but not the Spectrum version. It has large sprites, but maybe the scroll is too fine to make a coloured …
... position in buffer starting at 23296,DE-screen graphics position ... /> LD A,D ;screen graphics address to screen attribute addrees
RRCA ... br /> ;change copy tiles to buffer in loop code
; ... /> ;change copy single tile to buffer code
;jumps here ...ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... previous zero in the circular buffer to locate the beginning of ... only need to decompress data when moving to a different screen, then ... use the bitmap screen itself as the decompression buffer. If you ... top 2/3 screen sectors for the circular buffer (thus 4096 ...
