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zxasm.net facebook group - COMPO #6 – 256 byte game compo – THE RESULTS !!!The results of the last compo are in. All entries include the source code. [img]http://zx-speccy.co.uk/Copy2WebServerData/2016716_12380.png[/img]…
... /2016/07/16/compo-6-256-byte-game-compo-the-results/"]zxasm ... /2016/07/16/compo-6-256-byte-game-compo-the-results/[/url ... -
He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…
... as the high byte for a look-up table of addresses. The ... hardware supplies the low byte (depends ...
In practice the low byte could be anything so programmers ... filled the entire 256-byte block with that byte to make sure ... -
How would you do a negative image ?So I want to invert a Speccy bitmap. What would be the fastest and easiest way to this ? I've been using this a lot but I can't see how I could achi…
... if you create a look up table with the above routine for ... and place it at a 256 boundary, then you can use ... ,(hl) ;D = high byte of the look up table
ld a,(de ... -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
Anyone care to write a version that doesn't require a table aligned to 256 byte boundaries (and has the table directly following the code)? Thought I'd ask in case someone does so that I can avoid a little work :-) -
Delay routineAs some people are aware, I have recently starting writing a [url=http://fuse-emulator.svn.sourceforge.net/viewvc/fuse-emulator/trunk/fusetest/]autom…
... require a table aligned to 256 byte boundaries (and has the table directly ... [CODE]overhead2 EQU 21 + (LOW table)[/CODE]
The 16 is ... that as long as the table and the "remainder" routines ... ] ASSERT (HIGH t_ret = HIGH table)[/CODE], which will fail if ... -
Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
... hl,&4000 ; first display byte
ld de,&57ff ... ; last display byte
ld b,revtab/256
loop:
halt
defs (-$)%256 ; 256-byte align
revtab:
defb & ... -
Easiest way to figure instruction lengthGiven a start address, what is the easiest way to find out instruction length at that address in Z80? I found [url="http://www.z80.info/decoding.htm"…
... end I went for the table solution, but not a ... handler table but an index table. As I'm ... special index for 1 byte instructions to which all ... for 2, 3, and 4 byte instructions.
That ... opcodes to 256 byte page and use this table to convert ... -
A sped up pixel-shift routine for 1-byte–wide spritesHere’s an optimized (for speed) real-time sprite shifting routine for sprites that are one byte wide. It uses no memory variables for storage of inte…
... of shifts or current screen/sprite data address. Instead, it uses ... -iraq-2017-a-shoot-em-up"]my game[/url] for the ...
[code] align hi($)==hi($+8) ? 1 : 256[/code]
256-byte boundary. If that’s not ... -
Screen routinesHello. For my games I?m using the sprites routine method of a screen buffer and when I finish to print all the sprites I dump all the buffer in the …
... a look-up table - or actually 8 of them - each of 256 bytes ... would then look-up the shift of the sprite graphic, rather than ... you align the tables on 256-byte boundaries you can select the table for ... of 13, getting my first sprite routine to work - it was ... -
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…
...
; draw column aligned sprite, arbitrary row
; DOES NOT ... -coord
; look up screen address from the table
ld a ... section
ALIGN 256
; screen address table. This must be 256 byte aligned
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…
...
; draw column aligned sprite, arbitrary row
; DOES NOT ... -coord
; look up screen address from the table
ld a ... section
ALIGN 256
; screen address table. This must be 256 byte aligned
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…
... of data for the sprite must be ALIGN 32.
Note ... tbl_scraddr be aligned to a 256 byte boundary
adc h ... br /> ; look up screen address from the table
ld ... ; 16x16 graphics. align to 32 byte boundary
ALIGN 32
gfx16x16_ball ...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…
...
; draw column aligned sprite, arbitrary row
; DOES NOT ... -coord
; look up screen address from the table
ld a ...
ALIGN 256
; screen address table. This must be 256 byte aligned
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…
...
; draw column aligned sprite, arbitrary row
; DOES NOT ... -coord
; look up screen address from the table
ld a ...
ALIGN 256
; screen address table. This must be 256 byte aligned
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…
...
; draw column aligned sprite, arbitrary row
; DOES NOT ...
ALIGN 256
; screen address table. This must be 256 byte aligned
[/code]
Tidied up the code a bit. It ...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…
... don't want to give up on it.
... causes that DJNZ will repeat 256 times
.loop1
ALIGN 64
; modify this table to be based ...
; 16x16 graphics. align to 32 byte boundary
ALIGN 32
gfx16x16_wall ...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…
...
; draw column aligned sprite, arbitrary row
; DOES NOT ... -coord
; look up screen address from the table
ld a ...
ALIGN 256
; screen address table. This must be 256 byte aligned
Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
16x16 sprite drawing
[code]< ... bytes graphic data. MUST BE ALIGN 32
; l ... tbl_scraddr be aligned to a 256 byte boundary
adc ... /> ; look up screen address from the table
ld ... be aligned to a 256 byte boundary
adc ...Robospec (new project, hopefully useful as a tutorial as well)Starting a new project after my graphics investigations. * It's gonna be a Robotron clone since that's not too ambitious (although I'd like to hav…
... column aligned sprite, arbitrary row, always using a table lookup for ... hl
; look up screen address from the table
ld a ... bytes graphic data. MUST BE ALIGN 32
; l = pixel ... tbl_scraddr be aligned to a 256 byte boundary
adc h ; A ...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 …
... instructions
#DEFINE DEFB .BYTE
#DEFINE DEFW .WORD< ... ;BUILDING UP A TABLE WITH
LD BC,0FDH ;253*256+253, ... LD L,A ; GET HI BYTE BACK, SO H NOW IS ... A
; MERGE SPRITE COLOR WITH EXISTING PAPER COLOR ...Scrolling Bi-Colour Engine for 4-Player GamesJust putting this code up for people to have a look at. Far from finished. Should simply compile and run a bit of a demo. Only good for 128K and +…
Just putting this code up for people to have a ... point to 191*256+191 = 49087
;Call up to three interrupt ... .
;Full 16x16 masked attribute sprite routines.
MACRO ... />
;Interrupt vector table to go at 190*256 = 48640..48896
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 meantime I've knocked up a little console framework ... /> ELSE
FONTBASE EQU nice_font - 256
ENDIF
... /> ld h, (hl) ; second byte of table
add d ; add on ... ld h, (hl) ; second byte of table
add d ; add on ...Advice about drawing sprites on spectrum I've coded sprite drawing before and know all the theory about masks from a long time ago (microhobby rules! ;), but since I did it on Amiga with ha…
... a copy of each sprite. This is _wasteful_ of ... /> 2. Having a shifting table, along these lines:
... The rotation table is pointed at by h*256 and ... pedantic. The table must start on a 256-byte boundary.
... it up every so slightly (10 cycles per byte or ...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 …
... you have to look up the table for every byte, which is fairly ... dealing with only 256 bytes. Each of this 256 byte tables is organized ... in a such way, that the byte ... width and height for each sprite, and there are many different ...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] ; ***********…
... /> ; ********************************************
#define DEFB .BYTE
#define DEFW .WORD
sprite data
LD B ... Building up a table with
ld bc,0FDh ;253*256+ ...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…
... display (32x24) and sets up the memory map described at ... bottom right corner within the sprite engine.
The ... t need the rotation table. The rotation table is not used to ... is actually two 256 byte arrays, with the first 256 bytes containing the ...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…
... type association table and the sprite draw function table.
... />
The flag byte passed to "sp1_Initialize()" as parameter ... sprite graphics are defined coming up.
Once the sprite ... a sprite horizontally and vertically through 256 characters ...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…
... I am going to write up a brief description of ... Spectrum was designed with pull-up resistors on its entire ... /> ; * d4f5 - d4f6 SP1.LIB sprite draw function table (indexed by type) address ... want a 257-byte table. A "0" would make a 256-byte table, which is ...Sprites...What is fastest way for drawing masked sprites at any screen position without using preshifted data ? I want to use it for isometric view game... li…
Simple - use a look-up table to shift the sprite data as you draw ... bytes, aligned on a high-byte boundary, so you can use ... graphic value as the low-byte, and read out it's ... shifted two byte value (the second being 256 bytes up from the ...VIC 20 emulation on the SpectrumI'm sure most people are aware of the my attempt at bringing the full Commodore experience to Sinclair users with the "Twenty Commodes" program. It e…
... />
It's shaping up to be a CSSCGC 2009 ... immediately.
Added separate "sprite" and colour for the head ... screen
; PTR2 points to 256 byte table of worm segment positions
SPRITE data
LDA #SPRITES%256
STA ...
