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A z88dk + sp1 demo (with source)Since nowadays people are still wondering about how difficult it is to make something in z88dk, I thought I just put a very simple demo to show how e…
... ="Red"]Update[/COLOR][/B]: A new z88dk/sp1 installation can ... to worry about writing a sprite routine, a joystick handler and ... I find that a good tradeoff.
Just look at this ... = 10;
// Table Holding Movement Data for Each ... -
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 …
... is drawn from the bottom up,
starting with the ... registers
ld a, 0x3b ; high byte of vector table
ld ... i, a
pop ... 16384 + 6144 - (line * 16) - (cell * 256) - (row * 32) - (chunk * 2048)
Mirror tableCan anyone help with a byte mirror table? e.g. so you can look up a byte of a left-facing sprite and return the correct right-facing value. There …
... with a byte mirror table? e.g. so you can look up a byte of a left ... there was a simple way of looking up a byte and returning ... its mirrored value from the table using ... if anyone's got a byte mirror table to hand, please point ...Basic and AY musicis it possible to play an ay-music in background while a basic program is running?
... /> Also RST 38 is one byte compared to three for CALL ... use I register to look at table at HIGHBYTE * 256 then get IM2 ... able to shove it all up at the top of the ... any).
As to a suitable place for the RAMTOP ...New project for 256 colours Games emulator!O.K. , I suggested Jonathan Needle ( Creator of the excellent Spectaculator at [url="http://www.Spectaculator.com"]www.Spectaculator.com[/url] ) to c…
... display file, construct a single byte identifying one of 256 colours as follows ... 8-bit value and look it up in a 256-entry pallette to get ... a 24-bit RGB value ... must either save such a pallette table with the existing set of ...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 …
... ", as you have to look up the table for every byte, which is fairly ... only 256 bytes. Each of this 256 byte tables is organized in a such ... way, that the byte needed ...New Compo IdeaI've had this idea and would like to know what do you think about it. I think that most of us here know how to code in BASIC. The problem with Specc…
... to use a charset stored at 50000: 50000-256=49744, ... (left, right, down, up and fire, respectively) and ... and 0 (left, down, up, right and fire, respectively).< ...
POKE PEEK 23633 + 256 * PEEK 23634, 111
... in ROM, you may end up with garbage.
< ...JSW - Is this possible?There's an object in the Conservatory Roof which I reckon cannot be collected without losing a life. There's a snapshot taken in the Conservatory …
... of "Ballroom East" for a few seconds, and various seen ... byte of guardian-instance
(i.e. index into Guardian-Class Table ... /> ADD HL,HL ; HL = 8*(256*20 + L) = 40960 + 8*L ... twice. It therefore tries to look up the guardian-class at (20480 ...Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …
... at address (I+255),(I+256) to be read and jumped ... , one usually makes a 257 byte table all containing the same byte. This will ... multiple keypresses, as in a game situation, have a look at:
If you back up to:
[url="http ...ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... of sprites in 256 planes lying above ... " character cell to speed up certain situations:
< ... 8-byte pixel buffer and a 1-byte attribute ... a character cell from the associated "struct sp1_update". Have another look ... = MSB of rotation table to use
...ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... br />
The flag byte passed to "sp1_Initialize()" as parameter ... the sprite draw function table that stores the ... sprite graphics are defined coming up.
... (). If you have a look at sp1.h you ... s virtual display is 256 by 256 characters in size. ...ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... of udg data are looked up from a table of udg addresses using ... of attributes used are looked up from a table of attribute addresses using ... -byte entries for attr and attr mask would be used in a table look up ... doing things is to have 256 UDGs (8x8 tiles) as ...Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... to zx_cyx2saddr_callee(). If you look at the source for zx_cyx2saddr ... ldis decrease bc by one 256 times so b = 1 ... , 0xd000, 0xd1d1); // create a 257-byte table at address 0xd000 containing 0xd1 ... />
scroll_isr() is set up to scroll the message only ...splib2 from ROMI'm trying to generate IF2 ROM games for ZX Spectrum 16K using z88dk + splib2. So far I've managed to create a new crt0 file and to generate valid RO…
... the location of the rotation table in ROM, sp_Initialize() will ... ) but that will be up to you after reading the ... sp_Border
Creates a global byte variable locally inside the function ... of the 256 possible background chars.
If you look in ...Channels and streamsSo I've put some thought into channels and streams, and read the dead (and presumably rotting corpse) of the CSS FAQ which contains some information …
... do wit the start up code - put a wrapper around the functions ... established in (1) and (2) look into writing support for Harlequin ... gets updated. The jump table (in the 256 byte block starting at 0x3E00 ...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 …
... equ 0x5c36 ; start of font - 256
chans equ 0x5c4f ; ... prog) ; a channel must be created below BASIC
; so look at ... interrupts
ld a,0x3b ; High byte of address table...
ld ... exx
pop af ; scoop up 8 more bytes into registers ...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…
... LPRINT routine in the CHANS table to point to
... /> RET
;Look to see if last character ... indicator) and stick a
;zero byte in its place.< ... CRADR: DEFW font-352 ; was 256
WIDTH: DEFB 0< ... to the next pixel line up in
;the ...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…
... variant 2, it's not up to the windows which parts ... just iterate through the buffer, look which window is visible in ... bitmaps on them. If you align everythin to character cells, you ... ...) in a 256 characters set, so you just need to store a byte per ...General purpose full screen input routineHi Folks, One of the things that annoyed me back in the 1980s with most BASICs was the lack of a full screen "formatted" input function. You could …
... /> 100 DEF FN a(a,b,c,d,e ... da=PEEK 23639+256*PEEK 23640+8:< ... 256)*256: POKE 23564,INT (da/256):
RETURN
[/code]
enables a ... which should provide a slight speed improvement ... a 96-byte table of values coded in some way so that a single look-up ...Math Quiz - MultiplicationThe topic is fast multiplication routines, from 8x8 to 32x32 and all points in between. These functions sit underneath floating point libraries, gen…
... is expensive. A sum of squares method using a 512-byte table may be ... [QUOTE=catmeows;750917]To speed up multiplication with longer operands (16bit ... l revisit this when I look at the floating point multipliers ... quotient will be less than 256 and you can get ...Porting Blues Brothers CPC->ZX...just an ideaI've just watched a video of the CPC version of the Blues Brothers games by Titus [url]http://www.youtube.com/watch?v=6DOj-Ta3Ek4...Based[/url] on th…
... current form they'll take up too much roo. It' ... can be made to take up even less room. That ... more than one byte per tile - that's a waste of ... space. I'd keep a separate 256 byte table that holds properties for ... better. I'll take a look at how JtN2 works.
Game development guidesHello all, I want to get into game development for the ZX Spectrum and would like to know where I can find some helpful guides. I've looked around t…
...
ld l, a
ld a, (hl) ; Look up value
table
xor a
ld d, a ; Set index high byte ... a, (frame_count)
add a,sineTable%256
ld l,a
adc a,sineTable/256 ...Other than using attributes what other ways to detect collisions, when using char based movement?So I'm slowly working out the bits and pieces to write a game completely in assembly. I've been using attributes when writing in BASIC to detect whet…
... start with it multiplied by 256 and divide that by 8 ... codes that make sense as a colour first, and meaning to ... know you've got one byte per character, and you don ... are. Then you look up collisions, etc. in your table instead of in ...How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... to 0.
Look up the CP instruction, flags ... text_out
; draw a checkerboard pattern at column 31 ... press a
ld a, #fd
in a, (# ...
ALIGN 64
; modify this table to be based ... (hl) ; e = low byte of screen address
inc ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... the font a bit more.
Next up I want ... to split the input buffer up into tokens and print ... l, a
ld a, (hl) ; first byte of value in table
... #00 ; `
ENDIF
ALIGN 256
tbl_rows dw SCRBUF_BASEADDR + #0000 ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... l, a
ld a, (hl) ; first byte of value in table
inc ... if it has been hooked up or not
call make_nil_cpair ... />
; aligned data first
ALIGN 256
alignedsectionstart:
IF !USEROMFONT ...Console frameworkStill working on Specotron, but at the point where working out the diagonal lines collision is not good at beer o'clock. In the meantime I've knoc…
... l, a
ld a, (hl) ; first byte of value in table
inc ... if it has been hooked up or not
call make_nil_cpair ... />
; aligned data first
ALIGN 256
alignedsectionstart:
IF !USEROMFONT ...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…
... print
ld (de),a ;??print a blank byte on line1
nextbyte ... a,c ;check that line count again
and $3f ;look at ... of 256 up the display file
ld h,a ;point there(byte to ... of 256 up the display file
ld d,a ;point there(byte to ...Activision want a "screen shot touch up artist"We all know that screenshots for upcoming commercial games are often touched up (enhanced) before being given to magazines or uploaded to the 'net, b…
... commercial games are often touched up (enhanced) before being given to ... . Until now...
Have a look at:
[URL]http ...
