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The Only Reason Sinclair Succeeded (Provoking Controversy)Although I love my Sinclairs dearly, I think that the only reason they succeeded was because at the time most people did not know any better (factori…
... for experimentalists who managed to push the display resolution from ... is a substitute for cpu speed. It just so happens that ... a home-grown industry to write games that took advantage of ... playable (usually they were title screen special effects). A few games ... -
Help understanding some z80 asmI'm trying to work out how to represent the structure of a "sprite" in the SAM as "Grabbed" by SmallC. I can see the assembler implementation but I …
... z88dk, as I can write my own routines for blitting ... if I have to write my own routines to ... param1
push hl
push de
push bc
push af
screen that change. On machines with limited cpu speed (in ... z80 is able to write 16 bit numbers to ... -
Fixing Attribute Clash via emulationI'm sorry if this has been posted already, but is there a possibility to fix attribute clash via emulation? I'm not talking about RealSpec or any of …
... and the write new programs to deal with the changed screen layout ... mode 2) and the dual screen mode as seen in the ... more memory and the cpu speed to display size ratio drops ... was too much RAM to push around for a cpu isolated ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... foray - perhaps a fixed-screen game? as scrolling games ... amount from trying to write one.[/quote]Thanks for ... realise looking at the speed it's never going ... br /> scrlcount
push bc ;save line counter
savscrpos
push hl ;save road left side ... -
help sought with first foray into machine code - pixel scrolldownI have started to code my first machine code program, a simple roadrace game. I've based it around the pixel scrolldown routine in 40 Best Machine Co…
... kind of glitch on screen where part of a ... in the middle of the screen has scrolled but some ... for regular push/pop and will decrease the copy speed from ... block where you want to write to. I hope you' ... will see somewhere up the screen. This happens when the ... -
Fast screen writesI wondered what the faster than LDIR methods of writing to the screen were.
... corrupt the screen in the process.[/QUOTE]
In PUSH-filler case ... in register pair and PUSH it into screen buffer) interrupts can be ... data by POP then write it to screen buffer) you have slightly ... get best speed, you can use 'ripple' read or write order. For ... -
Spectrum 2-3 times more powerfull than MSX?![url]http://www.youtube.com/watch?v=2-kI0urN9tI#t=8m18s[/url]
... use OUT to write data to the screen, whereas the Speecy ... can write directly to the address, even PUSH to write ... to the screen, which is quicker ... can exploit that to speed up screen updates and provide an ... -
Hi Res Print Routine neededHas anyone seen code for a print routine with pixel accuracy? That is print(y,x,CHAR) that allows 0 < y < 192 and 0 < x < 255 - that takes a charact…
... push af
;save off Counter, Address of Character Data, Screen Address, Screen ... of Character Data, Screen Address, Screen Address
ld ... just want a straight write rather than a ... a good balance between speed and size, if ... do want to speed it up a bit ... -
Using the stack to copy memory blocksA [b]PUSH[/b] and a [b]POP[/b] instruction together take less time than two [b]LDI[/b], so long [b]POP/PUSH[/b] sequences are sometimes used to copy …
... suggestion I switched to POP/PUSH. As I said, it's ... fully aware of what the screen is doing at any one ... well diable interrupts completely and write your game in carefully timed ... gameplay ran at a constant speed, even if your graphics setup ... -
emulatorsplease help can we see clearly which emulator emaulates which hardware is there any that has a pc function key for the mulitface nmi button and the +…
... - the disabled comport speed - hardware aabstraction - i could write a book - it ... results in microsft blu
screen - this does nto havppen if ... colours on a mode 3 screen - so well exaplained that ...
LD SP,screen_address
PUSH HL[/code][/QUOTE] -
Games in machine codeHi everyone, How do go about doing multiple shots like a machine gun, do you have to store every x and y position of each bullet? When you kill som…
... time to collect information to speed things up a little...
screen sprite X and Y postions ... /> mov ebp,ecx
push edi
lea edi ... sorted
mov [edi],eax ; Write sorted value
add edi ... -
Z88DK/SP1 library u_malloc() questionHi All, It may possibly be more appropriate for me to post this on the Z88DK forum, but I know quite a few WoSSers have used Z88DK, so here goes:- …
... both would reduce the full screen update array requirements from 7680 ... locals last can allow shorter push/pop sequences to access ... reduce code size and improve speed.
The point ... loop) would have you write struct_sp1_update addresses into an array ... -
Where's it all going?[Rerouted from 'Assembler Intricacies' in Development Forum] [QUOTE=Timmy;506104]I don't think we're in disagreement here. As I've said it's a niche…
... no? If we want to 'push the spectrum to its limits ... A lot of recalculation of screen addresses occur. Further, implementations might ... yet by existing games, perceived speed may increase again.
< ... a lot of work to write said library of draw primitives ... -
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…
... were talking about using POP/PUSH to copy data, and ... obvious way to speed up that read/write cycle is to ... them to write 11 separate lines of the screen - 352 ... to fetch the [I]screen address[/I] for each ... replacing the sequences of PUSH statements in the main ... -
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... for every possible combo the speed of the printing routine will ... br /> ld bc, do_it ; could write the bytes directly but
screen
call pixel_add + 2 ;< ... useful routine - it
push af ; calculates the relevant address ... -
Tile based graphics and scrolling thingy...Here's my best attempt so far at a tile based rendering and scrolling routine. It draws in 22 8*8 graphics tiles along the top of the screen (junk i…
... )
ld (hl),a ; Write to screen (7)
inc ... ; Point to next screen position before POPing HL< ... Preserve registers
push de
push bc
push af
... ldi ; Inline code here for speed
ldi
ldi ... -
Pixel engines for explosions...Hi... Iv a strange request... I was toying around with an old YS program, which can be found here: [url]http://www.users.globalnet.co.uk/~jg27paw4/ty…
... cunning parameter decides the speed at which the particle ... RET
L61559: PUSH BC
PUSH DE
EXX< ... Self modifying - initialisation will write this byte..
; ... />
SCR_TABLE: ; SCREEN ADDRESS TABLE NOW FOLLOWS IN ... -
Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
... cost of a loss of speed
org 50000
; last byte of the screen
ld hl, $ + 9 ; set ...
push hl ; write 16 bytes
push de
push bc
push af ... -
Fairlight's use of LDIRYS, comparing Fairlight and Nightshade, said: [quote]Fairlight is much more interesting even though the techniques that Bo Jangeborg uses for screen…
The reason PUSH/POP is so preferable for ... at the edges of the screen. But that's only viable ... POP and write the same things multiple times with PUSH.
speed. Sometimes, it's just not ... -
Byte-order backbufferThis is a tool for Z80 coders who wish the Spectrum screen had a serial layout. It runs as an interrupt mode 2 service routine and uses POP and PUSH …
... cost of a loss of speed
org 50000
push hl ; write 16 bytes
push de
push bc
push af ... 63628
attributes:
incbin "screen.atr" ; 768 bytes of attributes ... -
BIFROST* ENGINE 1.2 released!Another improved version of the BIFROST* ENGINE is now available! Download it here: [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0027405[/u…
... -wide if I really push the timing with everything ... linear buffer. Using LD/PUSH it might even be ... all 192 rows of the screen, except the processor time ... program running at half the speed of a ZX81.
... you might be able to write a looped routine, instead ... -
Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... use the Spin assembler to write a few bytes into the ... our game.
- write a BASIC program to run ... .
We will write the value 0 into ... stack we use 'push'. To write from the stack we ... speed.
To scroll the road down the screen we copy the screen ... -
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…
... entire map graphics to buffer screen,
draw ORing/ANDing ... /> draw the final buffer screen to main screen
loop
speed.
This stupid idea took a whole week to write ... joy of EXX instead of PUSH/POP.
Good ... -
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…
... entire map graphics to buffer screen,
draw ORing/ANDing ... /> draw the final buffer screen to main screen
loop
speed.
This stupid idea took a whole week to write ... joy of EXX instead of PUSH/POP.
Good ... -
Let's copy buffers!Figured I'd do some double buffered graphics, so I can render for several frames before displaying stuff. Yes, I mean on a 48k speccy, so no 128k spe…
... two bytes into HL and write with LD (NN),HL, ...
P.S. when the PUSH instructions are working back-to ... cycles before your next PUSH, as it won't ... the pixel part of the screen. Is this deliberate, to ... As obviously the biggest speed boost would come from doing ... -
Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…
... routine:
my_isr
push af ; Preserve any registers we ... (23295),a ; Write A to the corners of the screen
speed issues and the upper 16K ... -
Thought this would be simple... Z80Hi Folks, Started to read "Beyond simple BASIC, Delving Deeper into your ZX Spectrum" by Dilwyn Jones. This is a great book and I came across the…
... on the screen, you can skip the PLOT subroutine and write the ... pass the values. This will speed things up (a little):
exx
push hl
exx
