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i want to start writing my own gamesi want to start writing my own games but have no idea how. is there any downloadable dummys guides or some software that teaches u how. the only expe…
... wrote that I use a very handy look up table in the manual itself ... am I any more of a genius than the average user ... -
Skool Daze disassemblyWhile developing [url="http://pyskool.wordpress.com/"]Pyskool[/url], I've also been putting together a disassembly of Skool Daze and Back to Skool, m…
... flipped in memory (using a 256-byte "mirror" lookup table) to obtain the right ... bits as nibbles: two per byte. The INK always defaulted ... to Skool also used a lookup table to access text strings, ... text strings at 32-byte or 16-byte intervals, and used ... -
How to Write ZX Spectrum Games As some of you may know, it has long been my intention to produce a document which explains pretty much everything I have learned - and am still lea…
... br /> One Key at a Time
Multiple ... Keypresses
Joysticks
A Simple Game
... Addresses
Using a Screen Address Look-up Table
Calculating Screen ... Double Buffering
Creating a Screen Buffer
Scrolling ... -
3D Wireframe/vector animation creator and player?Is there any software that can help record wireframe 3D animations by creating a file that stores just the coordinates and lines? If the answer is "n…
... is just a bit of trigonometry, a quick sine look-up-table and a binary chop ... -
3D Wireframe/vector animation creator and player?Is there any software that can help record wireframe 3D animations by creating a file that stores just the coordinates and lines? If the answer is "n…
... is just a bit of trigonometry, a quick sine look-up-table and a binary ... things become more distant, they look smaller.
... screen at a constant z coordinate '-d' (assume you look down ... Changing d makes the world look smaller or bigger (or just ... -
Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…
Use a 256 byte, page aligned table that contains the mirror image of the relevant byte. -
Tricks to make mirror image of a graphic?I've been working on a sprite routine for lots of sprites and animations. I'm only storing right facing graphics, and converting them to left facing.…
[quote="AndyC;973416"]Use a 256 byte, page aligned table that contains the mirror image ... build the table.
To get the mirrored byte in 'a', I ... just 'ld l, a' and 'inc h' to my table ... -
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 …
... to use a look-up table - or actually 8 of them - each of 256 bytes ... you align the tables on 256-byte boundaries you can select the table for ... the shift required with the high-byte, and ... load the low-byte with the ... -
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…
... -coord
; look up screen address from the table
ld a, (hl)
; look up screen address from the table
ld a, (hl)
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…
... , b
; look up screen address from the table
ld a, (hl)
; look up screen address from the table
ld a, (hl)
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…
... bytes graphic data. MUST BE ALIGN 32
; l = ... be aligned to a 256 byte boundary
adc h ; A = H + ... br /> ; look up screen address from the table
ld a, (hl)< ... ; 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…
... bytes graphic data, Must be ALIGN 32
; l = ... requires tbl_scraddr be aligned to a 256 byte boundary
; store ... /> ; look up screen address from the table
ld a, (hl)
a
ret
ALIGN 256
tbl_rows ...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…
... , b
; look up screen address from the table
ld a, (hl)
; look up screen address from the table
ld a, (hl)
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…
... , b
; look up screen address from the table
ld a, (hl)
; look up screen address from the table
ld a, (hl)
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…
... , b
; look up screen address from the table
ld a, (hl)
; look up screen address from the table
ld a, (hl)
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…
... don't want to give up on it.
256 times
.loop1
a
ret
ALIGN 64
; modify this table to ... br /> ; 16x16 graphics. align to 32 byte boundary
ALIGN 32
gfx16x16_wall ...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…
... hl
; look up screen address from the table
ld a, (hl)
; look up screen address from the table
ld a, (hl)
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…
... , b
; look up screen address from the table
ld a, (hl)
; look up screen address from the table
ld a, (hl)
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…
... bytes graphic data. MUST BE ALIGN 32
; l = pixel ... be aligned to a 256 byte boundary
adc h ; A = H + carry ... hl
; look up screen address from the table
ld a, (hl)
ALIGN 32
; l = pixel ...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…
... hl
; look up screen address from the table
ld a, (hl)
ALIGN 32
; l = pixel ... be aligned to a 256 byte boundary
adc h ; A = H + carry ... bytes graphic data. MUST BE ALIGN 32
; l = pixel ...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 …
...
I have used a look up table for the char address, and ... instructions
#DEFINE DEFB .BYTE
#DEFINE DEFW .WORD ... ;BUILDING UP A TABLE WITH
LD BC,0FDH ;253*256+253, ... br /> LD H,SCREENTABLE/256 ; POINT H TO FA00H ...Moving a line down the display in assembler?...It's not a "[I]how can I do it[/I]" question, it's more a "am I missing something in trying to do it a new way" kinda question. What I've been doing…
... 27"]found[/URL] a routine that generates a 512 byte table (128 bytes of ... it wasted) - ie. two tables of 256 ... placed on the start of a 256 byte page.
So, ... the first example, I come up with this (untested);
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 +…
... putting this code up for people to have a look at. Far from ... br /> ;Use interrupt table at 48640 (190*256) and point to 191 ... />
;Interrupt vector table to go at 190*256 = 48640..48896
;Point interrupts to the table:
ld a,190
ld i ...Help needed with calculating screen addressesCan anyone help me finally crack Jonathan Cauldwell's screen addressing calculator and, more to the point, is the reason I'm struggling because this …
... doesn't require an address look-up table. In doing this we need ... our number in the low byte of the screen address.< ... the result to the high byte. That will give us ... screen display.
ld d,a ; line * 256.
[B]; ...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] ; ***********…
... /> I have also created a look up table for the "xpos" gfx ... ; ********************************************
#define DEFB .BYTE
#define DEFW .WORD
up a table with
ld bc,0FDh ;253*256+253 ...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…
... am going to write up a brief description of im2 ... was designed with pull-up resistors on its entire ... byte*256+byte as the address of the interrupt subroutine to call. Another look ... indicates we want a 257-byte table. A "0" would make a 256-byte table, which is ...Preferred way of determining Y co-ord in assembly?I know of 2 ways of calculating the y-cord of a pixel row for the speccy in assembly. One is to calculate the address by ways of shifting and masking…
... other way is to use a look up table I suppose that holds the ... ]
TABLE points to a 192 bytes table, aligned to a 256 byte boundary, and ... /> SMALLTAB points to a 30 bytes table, aligned to a 256 byte boundary, and this ...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…
... that as the high byte for a look-up table of addresses. The ... hardware supplies the low byte (depends ... br /> In practice the low byte could be anything so programmers ... filled the entire 256-byte block with that byte to make ...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 ... table consists of 8 sets of 512 bytes, aligned on a high-byte ... value as the low-byte, and read out it ... shifted two byte value (the second being 256 bytes up from the ... that case, reducing the table to 3.5K. As ...A scrolling starfield - help needed!I have been messing on my speccy again recently and tried to do a scrolling (parallax - maybe) starfield. I know how to scroll using machine code but…
... each star, I would use a look up table of screen row addresses. (I ... original high byte
LD H,A; effectively multiply result by 256
byte
LD A,(HL) ; read star byte into a
