Hmmmm, I see. I'm gonna try an article I found that uses R#14 and #15

About msx compression go here:
http://www.west.co.tt/matt/speccy/apology/bitbuster_extreme-0.1.tar.gz

Do you have tryed my code?
Do you see a sprite cycling all around the screen?

Quote:

Do you have tryed my code? Do you see a sprite cycling all around the screen?

I missed it. I'll Try it

The source posted @ April 11 2006, 12:34

Duh
It works. Thanks

Works over so i'll be of home... I will check the compression link (cannot download it at work).

This code reads the cursors and the spacebar.
Use them to control the sprite.

/*
* Project Hunter for MSX1 16kb ROM
*/
#include <stdlib.h>
#include <intrpt.h>

/*
* DEFINITIONS
*/
#define u_int   unsigned int
#define u_char  unsigned char
#define u_short unsigned short
#define bool    char
#define true    1
#define false   0

/*
* SCREEN 2 DEFINITIONS HARDCODED
*/

#define PNT  0x1800       // Pattern Name Table
#define PGT  0x0000       // Pattern Generator Table
#define PCT  0x2000       // Pattern Color Table
#define SAT  0x1b00       // Sprite Attribute Table
#define SPT  0x3800       // Sprite Pattern Table

// ROM Header 

#asm
romheader:
psect vectors
defb 'A','B'
defw _main
defb 0,0,0,0,0,0
defb 0,0,0,0,0,0
truestart:
#endasm

/*
* PORT mappings
*/
static port u_char v99 @ 0x99; // VDP: Command and status register
static port u_char v98 @ 0x98; // VDP: Video RAM data

static port u_char va2 @ 0xa2; // PSG: Data read
static port u_char va1 @ 0xa1; // PSG: Data write
static port u_char va0 @ 0xa0; // PSG: Address latch

extern u_char back1[8];
extern u_char back1_color[8];
extern u_char vdpregs[8];


/*
* VPD functions
*/
void init_vpd(u_char *source) {
    u_char x=8;
    di();
    for (; x > 0; x--) {
        v99 = *source++;
        v99 = (8-x) | 128;
    }
    ei();
}

void vwrite(u_short count, u_char *source, u_short addr) {
    di();
    v99 = addr & 255;
    v99 = (addr>>8) | 64;
    ei();
    
    for (;count > 0;count--){
        v98 = *source++; 
    }
}

void vfill(u_short count, u_char value,  u_short addr) {
    di();
    v99 = addr & 255;
    v99 = (addr>>8) | 64;
    ei();
    
    for (;count > 0;count--){
        v98 = value; 
    }
}


u_char checkkbd(u_char kbdline)
{
#asm
; checkkbd: ckeck keyboard line
; syntax:checkkbd <keyboar line #>
; in: e
; out: l
;
; i8255 ports
;
i8255porta  equ 0a8h        ; slot selection
i8255portb  equ 0a9h        ; keyboard column input
i8255portc  equ 0aah        ; leds, motor, cassette, kbd line
i8255portd  equ 0abh        ; mode select for i8255 ports A,B,C

        in  a,(i8255portc)
        and 011110000B    ; upper 4 bits contain info topreserve
        or  e
        out (i8255portc),a
        in  a,(i8255portb)
        ld  l,a
#endasm        
 }       

     
main()
{
    u_int  t;
    u_char room[768];
    u_char sprt[] = {100,124,0,15}; 
  
    init_vpd(vdpregs);
    for (t=0;t < 768; t++) {
        room[t]= 255-(t&255);
    }
    vfill(256*8*3, 0xf5, PCT);

    
    vwrite(8, back1, PGT);
    vwrite(8, back1_color, PCT);
    vwrite(768, room, PNT);

    vwrite(8, back1,SPT);
       
    while(1) {
        asm("halt");
        vwrite(4, sprt,SAT);
        sprt[0] += ((checkkbd(8) & 32) !=0)-((checkkbd(8) & 64)  !=0);  
        sprt[1] += ((checkkbd(8) & 16) !=0)-((checkkbd(8) & 128) !=0);  
        sprt[3] =  (sprt[3] + ((checkkbd(8) & 1)!=0)) & 15;  
    }
}

// Data segement
#asm
psect data
global _vdpregs
_vdpregs:
defb 0x02 // Reg# 0 000000[M3][EV]
defb 0x60 // Reg# 1 [4/16k][BLANK][IE][M1][M2]0[SIZE][MAG]
defb 0x06 // Reg# 2 0000[NAME TABLE BASE ADDRESS] = 3C00h
defb 0xff // Reg# 3 [COLOR BASE ADDRESS] 3000h
defb 0x03 // Reg# 4 00000[PATTERN GENERATOR BASE ADDRESS] 1800h
defb 0x36 // Reg# 5 0[SPRITE ATTRIBUTE TABLE BASE ADDRESS] 3C80h
defb 0x07 // Reg# 6 00000[SPRITE PTRN GNRTR BASE ADDRESS] 3800h
defb 0x01 // Reg# 7 [TEXT COLOR 4bts][BACKDROP COLOR 4bts]

global _back1
_back1:
defb 00011100B
defb 00110110B
defb 11000011B
defb 11010011B
defb 11001011B
defb 11000011B
defb 01100110B
defb 00111100B

global _back1_color
_back1_color:
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B


pad:
defs 0xbfff-0x8278 // substitute each time with the address of "pad" from the .sym file
defb 01
#endasm

Look at this simple 8 directional scroll with sprite movements

/*
* Project Hunter for MSX1 16kb ROM
*/
#include <stdlib.h>
#include <intrpt.h>

/*
* DEFINITIONS
*/
#define u_int   unsigned int
#define u_char  unsigned char
#define u_short unsigned short
#define bool    char
#define true    1
#define false   0

/*
* SCREEN 2 DEFINITIONS HARDCODED
*/

#define PNT  0x1800       // Pattern Name Table
#define PGT  0x0000       // Pattern Generator Table
#define PCT  0x2000       // Pattern Color Table
#define SAT  0x1b00       // Sprite Attribute Table
#define SPT  0x3800       // Sprite Pattern Table

// ROM Header 

#asm
romheader:
psect vectors
defb 'A','B'
defw _main
defb 0,0,0,0,0,0
defb 0,0,0,0,0,0
truestart:
#endasm

/*
* PORT mappings
*/
static port u_char v99 @ 0x99; // VDP: Command and status register
static port u_char v98 @ 0x98; // VDP: Video RAM data

static port u_char va2 @ 0xa2; // PSG: Data read
static port u_char va1 @ 0xa1; // PSG: Data write
static port u_char va0 @ 0xa0; // PSG: Address latch

extern u_char back1[8];
extern u_char back1_color[8];
extern u_char vdpregs[8];


/*
* VPD functions
*/
void init_vpd(u_char *source) {
    u_char x=8;
    di();
    for (; x > 0; x--) {
        v99 = *source++;
        v99 = (8-x) | 128;
    }
    ei();
}

void vwrite(u_short count, u_char *source, u_short addr) {
    di();
    v99 = addr & 255;
    v99 = (addr>>8) | 64;
    ei();
    
    for (;count > 0;count--){
        v98 = *source++; 
    }
}

void vfill(u_short count, u_char value,  u_short addr) {
    di();
    v99 = addr & 255;
    v99 = (addr>>8) | 64;
    ei();
    
    for (;count > 0;count--){
        v98 = value; 
    }
}


u_char checkkbd(u_char kbdline)
{
#asm
; checkkbd: ckeck keyboard line
; syntax:checkkbd <keyboar line #>
; in: e
; out: l
;
; i8255 ports
;
i8255porta  equ 0a8h        ; slot selection
i8255portb  equ 0a9h        ; keyboard column input
i8255portc  equ 0aah        ; leds, motor, cassette, kbd line
i8255portd  equ 0abh        ; mode select for i8255 ports A,B,C

    in  a,(i8255portc)
    and 011110000B    ; upper 4 bits contain info topreserve
    or  e
    out (i8255portc),a
    in  a,(i8255portb)
    ld  l,
#endasm        
}       

#define map_w   4*32
#define map_h   2*24


void vscreen(u_char * addr) {
    
    di();
    v99 = PNT & 255;
    v99 = (PNT>>8) | 64;
    ei();
#asm    
    ex  de,hl
    ld  c,0x98
    ld  de,map_w-32        
    rept    24
    ld  b,0x20
    otir
    add hl,de
    endm    
#endasm     
}

     
main()
{
    u_int  t;
    u_char room[map_w*map_h];
    u_char sprt[] = {100,124,0,15}; 
    
    u_char *window = room;
  
    init_vpd(vdpregs);
    for (t=0;t < map_w*map_h; t++) {
        room[t]= (t&255);
    }
    vfill(256*8*3, 0xf5, PCT);

    vwrite(256*8, 0x1bbf, PGT);    
    vwrite(256*8, 0x1bbf, PGT+256*8);
    vwrite(256*8, 0x1bbf, PGT+256*8*2);    
    
    vwrite(8, back1, PGT);
    vwrite(8, back1_color, PCT);

    vwrite(8, back1,SPT);
       
    while(1) {
        u_char kbd = checkkbd(8);
        
        asm("halt");
        vscreen(window);
        vwrite(4, sprt,SAT);
        
        sprt[0] += ((kbd & 32) !=0)-((kbd & 64)  !=0);  
        sprt[1] += ((kbd & 16) !=0)-((kbd & 128) !=0);  
        sprt[3] =  (sprt[3] + ((kbd & 1)!=0)) & 15;  

        window  += ((kbd & 16) !=0)-((kbd & 128)  !=0);  
        window  += (((kbd & 32) !=0)-((kbd & 64)  !=0))*map_w;  
        
    }
}

// Data segement
#asm
psect data
global _vdpregs
_vdpregs:
defb 0x02 // Reg# 0 000000[M3][EV]
defb 0x60 // Reg# 1 [4/16k][BLANK][IE][M1][M2]0[SIZE][MAG]
defb 0x06 // Reg# 2 0000[NAME TABLE BASE ADDRESS] = 3C00h
defb 0xff // Reg# 3 [COLOR BASE ADDRESS] 3000h
defb 0x03 // Reg# 4 00000[PATTERN GENERATOR BASE ADDRESS] 1800h
defb 0x36 // Reg# 5 0[SPRITE ATTRIBUTE TABLE BASE ADDRESS] 3C80h
defb 0x07 // Reg# 6 00000[SPRITE PTRN GNRTR BASE ADDRESS] 3800h
defb 0x01 // Reg# 7 [TEXT COLOR 4bts][BACKDROP COLOR 4bts]

global _back1
_back1:
defb 00011100B
defb 00110110B
defb 11000011B
defb 11010011B
defb 11001011B
defb 11000011B
defb 01100110B
defb 00111100B

global _back1_color
_back1_color:
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B
defb 00001111B


pad:
defs 0xbfff-0x8352// substitute each time with the address of "pad" from the .sym file
defb 01
#endasm

LOL You're coding faster than I can ask for

I hope I have some time today at work (there's a big crisis at the moment) to test it.

I'ts working. Nice.
Don't think I will use the scrolling but it's nice to play with. I'going to build a map editor now......

Why not a scrolling? Please ! Consider the this possibility !
I'd love to see a new scroller game!
I can support you in the scrolling implementation.

The most difficult thing is the sprite management, where the objects
can move and live in a map larger that the displayed window,
but it is C, it should be easy to cope with those problems.

BTW, I have found a strange problem, you should Change

...
    out (i8255portc),a
    in  a,(i8255portb)
    ld  l,
#endasm        
}       

in

...
    out (i8255portc),a
    in  a,(i8255portb)
    ld  l,a
#endasm        
}       

It is strange you've got it working as it was

Scrolling in Screen2 only works good on Shooters and racing games. a 8x8 scrolling game makes moving a sprite by 2 pixels impossible.

If I go for a scrolling game it should only work in screen4 or higher. Making enemies that still move when they are not visual shouldn't be a problem (scrolling or no scrolling) main pr0blem would be having all level data in memory(only 16kb).

I saw the missing 'a' so I changed it (it was giving a warning when compiling)

Scrolling 8x8 is fine also in platforms and in AD&D style games.



BTW actually I have no idea about the game you want to develop, can you unveil some details?

About the 8x8 scrolling, I have to stress that there are many simple tricks to make excellent smooth scrollings: teh easiest is simply scroll at max speed half a page at time!

You see, the 8x8 scroll is smooth if it moves the page 8 pixels per frame. The problem is that the main character cannot run at that speed.

The solution is: move the main character at the speed you want and do not scroll until it reaches a given point of the screen (on the left or on the right), then scroll the screen of half a page at the max speed.

E.g. if the bar is the whole screen, scroll of half a screen at max speed when the main character reaches one of the two ‘S’.

|---S------S---|
   <--    -->

This gives also a sort of "surprise effect" as unveil half a screen all in once

This means that you have a screen large 32 characters ,
you can scroll it horizontally of 16 characters at time
each time the main sprite reaches character 8 on the left
or character 24 on the right.

Doing in this way, assuming ther you scrolled to the rigth,
after the scroll, your main sprite that was at character 24
should have gone at character 8.