「VDPアクセス例」の編集履歴（バックアップ）一覧はこちら
「VDPアクセス例」(2012/04/15 (日) 01:26:28) の最新版変更点
追加された行は緑色になります。
削除された行は赤色になります。
既に作成したinp(),outp()I/O関数を用いてVDPを直接扱う。
VDPを直接設定し画面モードを切り替える場合は、BIOSと異なりレジスタの操作と画面初期化
などを必要とする。
新たに作成した関数はVDPレジスタアクセス、メモリーアドレス設定、フォント再設定の
三つの関数のみ。
VRAMへのアクセス方法は初めにアドレス(VMemadr)をセットし、後はI/Oダイレクト(outp/inp)に連続してリードライトする。
SCREEN8へ切り替えはVDPモードレジスタの設定だけでなく、CLS処理など
画面の初期化を行なう必要がある。
SCREEN8からテキストモードSCREEN0へ復帰する際は、9938/9958のフォントデータを
再セットアップする必要がある。
以下のサンプルコードは英数字のみ。
サンプル例はSCREEN0(WIDTH40)から、SCREEN8にモード切替え後、再びSCREEN0(40)へ戻る
サンプルソースコード。
vdpexample.c
//ALPHABET FONT
const unsigned char f[96][8]={
{0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0},
{0x20,0x20,0x20,0x20,0x0,0x0,0x20,0x0},
{0x50,0x50,0x50,0x0,0x0,0x0,0x0,0x0},
{0x50,0x50,0xF8,0x50,0xF8,0x50,0x50,0x0},
{0x20,0x78,0xA0,0x70,0x28,0xF0,0x20,0x0},
{0xC0,0xC8,0x10,0x20,0x40,0x98,0x18,0x0},
{0x40,0xA0,0x40,0xA8,0x90,0x98,0x60,0x0},
{0x10,0x20,0x40,0x0,0x0,0x0,0x0,0x0},
{0x10,0x20,0x40,0x40,0x40,0x20,0x10,0x0},
{0x40,0x20,0x10,0x10,0x10,0x20,0x40,0x0},
{0x20,0xA8,0x70,0x20,0x70,0xA8,0x20,0x0},
{0x0,0x20,0x20,0xF8,0x20,0x20,0x0,0x0},
{0x0,0x0,0x0,0x0,0x0,0x20,0x20,0x40},
{0x0,0x0,0x0,0x78,0x0,0x0,0x0,0x0},
{0x0,0x0,0x0,0x0,0x0,0x60,0x60,0x0},
{0x0,0x0,0x8,0x10,0x20,0x40,0x80,0x0},
{0x70,0x88,0x98,0xA8,0xC8,0x88,0x70,0x0},
{0x20,0x60,0xA0,0x20,0x20,0x20,0xF8,0x0},
{0x70,0x88,0x8,0x10,0x60,0x80,0xF8,0x0},
{0x70,0x88,0x8,0x30,0x8,0x88,0x70,0x0},
{0x10,0x30,0x50,0x90,0xF8,0x10,0x10,0x0},
{0xF8,0x80,0xE0,0x10,0x8,0x10,0xE0,0x0},
{0x30,0x40,0x80,0xF0,0x88,0x88,0x70,0x0},
{0xF8,0x88,0x10,0x20,0x20,0x20,0x20,0x0},
{0x70,0x88,0x88,0x70,0x88,0x88,0x70,0x0},
{0x70,0x88,0x88,0x78,0x8,0x10,0x60,0x0},
{0x0,0x0,0x20,0x0,0x0,0x20,0x0,0x0},
{0x0,0x0,0x20,0x0,0x0,0x20,0x20,0x40},
{0x18,0x30,0x60,0xC0,0x60,0x30,0x18,0x0},
{0x0,0x0,0xF8,0x0,0xF8,0x0,0x0,0x0},
{0xC0,0x60,0x30,0x18,0x30,0x60,0xC0,0x0},
{0x70,0x88,0x8,0x10,0x20,0x0,0x20,0x0},
{0x70,0x88,0x8,0x68,0xA8,0xA8,0x70,0x0},
{0x20,0x50,0x88,0x88,0xF8,0x88,0x88,0x0},
{0xF0,0x48,0x48,0x70,0x48,0x48,0xF0,0x0},
{0x30,0x48,0x80,0x80,0x80,0x48,0x30,0x0},
{0xE0,0x50,0x48,0x48,0x48,0x50,0xE0,0x0},
{0xF8,0x80,0x80,0xF0,0x80,0x80,0xF8,0x0},
{0xF8,0x80,0x80,0xF0,0x80,0x80,0x80,0x0},
{0x70,0x88,0x80,0xB8,0x88,0x88,0x70,0x0},
{0x88,0x88,0x88,0xF8,0x88,0x88,0x88,0x0},
{0x70,0x20,0x20,0x20,0x20,0x20,0x70,0x0},
{0x38,0x10,0x10,0x10,0x90,0x90,0x60,0x0},
{0x88,0x90,0xA0,0xC0,0xA0,0x90,0x88,0x0},
{0x80,0x80,0x80,0x80,0x80,0x80,0xF8,0x0},
{0x88,0xD8,0xA8,0xA8,0x88,0x88,0x88,0x0},
{0x88,0xC8,0xC8,0xA8,0x98,0x98,0x88,0x0},
{0x70,0x88,0x88,0x88,0x88,0x88,0x70,0x0},
{0xF0,0x88,0x88,0xF0,0x80,0x80,0x80,0x0},
{0x70,0x88,0x88,0x88,0xA8,0x90,0x68,0x0},
{0xF0,0x88,0x88,0xF0,0xA0,0x90,0x88,0x0},
{0x70,0x88,0x80,0x70,0x8,0x88,0x70,0x0},
{0xF8,0x20,0x20,0x20,0x20,0x20,0x20,0x0},
{0x88,0x88,0x88,0x88,0x88,0x88,0x70,0x0},
{0x88,0x88,0x88,0x88,0x50,0x50,0x20,0x0},
{0x88,0x88,0x88,0xA8,0xA8,0xD8,0x88,0x0},
{0x88,0x88,0x50,0x20,0x50,0x88,0x88,0x0},
{0x88,0x88,0x88,0x70,0x20,0x20,0x20,0x0},
{0xF8,0x8,0x10,0x20,0x40,0x80,0xF8,0x0},
{0x70,0x40,0x40,0x40,0x40,0x40,0x70,0x0},
{0x88,0x50,0x20,0x70,0x20,0x70,0x20,0x0},
{0x70,0x10,0x10,0x10,0x10,0x10,0x70,0x0},
{0x20,0x50,0x88,0x0,0x0,0x0,0x0,0x0},
{0x0,0x0,0x0,0x0,0x0,0x0,0xF8,0x0},
{0x40,0x20,0x10,0x0,0x0,0x0,0x0,0x0},
{0x0,0x0,0x70,0x8,0x78,0x88,0x78,0x0},
{0x80,0x80,0xB0,0xC8,0x88,0xC8,0xB0,0x0},
{0x0,0x0,0x70,0x88,0x80,0x88,0x70,0x0},
{0x8,0x8,0x68,0x98,0x88,0x98,0x68,0x0},
{0x0,0x0,0x70,0x88,0xF8,0x80,0x70,0x0},
{0x10,0x28,0x20,0xF8,0x20,0x20,0x20,0x0},
{0x0,0x0,0x68,0x98,0x98,0x68,0x8,0x70},
{0x80,0x80,0xF0,0x88,0x88,0x88,0x88,0x0},
{0x20,0x0,0x60,0x20,0x20,0x20,0x70,0x0},
{0x10,0x0,0x30,0x10,0x10,0x10,0x90,0x60},
{0x40,0x40,0x48,0x50,0x60,0x50,0x48,0x0},
{0x60,0x20,0x20,0x20,0x20,0x20,0x70,0x0},
{0x0,0x0,0xD0,0xA8,0xA8,0xA8,0xA8,0x0},
{0x0,0x0,0xB0,0xC8,0x88,0x88,0x88,0x0},
{0x0,0x0,0x70,0x88,0x88,0x88,0x70,0x0},
{0x0,0x0,0xB0,0xC8,0xC8,0xB0,0x80,0x80},
{0x0,0x0,0x68,0x98,0x98,0x68,0x8,0x8},
{0x0,0x0,0xB0,0xC8,0x80,0x80,0x80,0x0},
{0x0,0x0,0x78,0x80,0xF0,0x8,0xF0,0x0},
{0x40,0x40,0xF0,0x40,0x40,0x48,0x30,0x0},
{0x0,0x0,0x90,0x90,0x90,0x90,0x68,0x0},
{0x0,0x0,0x88,0x88,0x88,0x50,0x20,0x0},
{0x0,0x0,0x88,0xA8,0xA8,0xA8,0x50,0x0},
{0x0,0x0,0x88,0x50,0x20,0x50,0x88,0x0},
{0x0,0x0,0x88,0x88,0x98,0x68,0x8,0x70},
{0x0,0x0,0xF8,0x10,0x20,0x40,0xF8,0x0},
{0x18,0x20,0x20,0x40,0x20,0x20,0x18,0x0},
{0x20,0x20,0x20,0x0,0x20,0x20,0x20,0x0},
{0xC0,0x20,0x20,0x10,0x20,0x20,0xC0,0x0},
{0x40,0xA8,0x10,0x0,0x0,0x0,0x0,0x0},
{0,0,0,0,0,0,0,0}
};
extern unsigned char inp(unsigned char);
extern outp(unsigned char,unsigned char);
void VRegister(unsigned char reg, unsigned char data);
void VMemadr(long addr, char rw);
void Fontset(void);
void main(void){
long i;
int j;
//SCREEN8
VRegister(0,0xE);
VRegister(1,0x60);
//VDP DISPSCAN BASE ADDRESS(PATTERN NAME TABLE)
VRegister(2,0x1F);
//SPRITE OFF
VRegister(8,0xA);
//SET ADDRESS,WRITE MODE
VMemadr(0,1);
//WRITE VMEM(I/O DIRECT)
for(j=0; j<0xd3ff; j++){
outp(0x98,0);
}
//WAIT
for(i=0; i<300000; i++);
//RETURN SCREEN0(40)
VRegister(0,0);
VRegister(1,0x70);
//VDP DISPSCAN BASE ADDRESS
VRegister(2,0x0);
//SCREEN0(40) FONT RECOVER
Fontset();
}
//function(Register number, Data)
void VRegister(unsigned char reg, unsigned char data){
outp(0x99,data);
outp(0x99,reg+0x80);
}
//function(VMem Address, 0-Read/1-Write)
void VMemadr(long addr,char rw){
unsigned char low,mid,hi;
low=addr & 0xff;
mid=(addr >> 8) & 0x3f;
hi=(addr >>14) & 0x7;
//HI ADDR
outp(0x99,hi);
//R#14
outp(0x99,0x8e);
//LOW ADDR
outp(0x99,low);
//MID ADDR
if (rw) {
//WRITE
outp(0x99,mid+0x40);
}else{
//READ
outp(0x99,mid);
}
}
void Fontset(){
int i;
int j;
//SET VFONT ADDRESS
//(PATTERN GENERATOR TABLE,SCREEN0/WIDTH40)
VMemadr(0x900,1);
//WRITE FONT(ALPHABET ONLY)
for(i=0; i<96; i++){
for(j=0; j<8; j++){
outp(0x98,f[i][j]);
}
}
}
既に作成したinp(),outp()I/O関数を用いてVDPを直接扱う。
VDPを直接設定し画面モードを切り替える場合は、BIOSと異なりレジスタの操作と画面初期化
などを必要とする。
新たに作成した関数はVDPレジスタアクセス、メモリーアドレス設定、フォント再設定の
三つの関数のみ。
VRAMへのアクセス方法は初めにアドレス(VMemadr)をセットし、後はI/Oダイレクト(outp/inp)に連続してリードライトする。
SCREEN8へ切り替えはVDPモードレジスタの設定だけでなく、CLS処理など
画面の初期化を行なう必要がある。
SCREEN8からテキストモードSCREEN0へ復帰する際は、9938/9958のフォントデータを
再セットアップする必要がある。
以下のサンプルコードは英数字のみ。
サンプル例はSCREEN0(WIDTH40)から、SCREEN8にモード切替え後、再びSCREEN0(40)へ戻る
サンプルソースコード。
vdpexample.c
//ALPHABET FONT
const unsigned char f[96][8]={
{0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0},
{0x20,0x20,0x20,0x20,0x0,0x0,0x20,0x0},
{0x50,0x50,0x50,0x0,0x0,0x0,0x0,0x0},
{0x50,0x50,0xF8,0x50,0xF8,0x50,0x50,0x0},
{0x20,0x78,0xA0,0x70,0x28,0xF0,0x20,0x0},
{0xC0,0xC8,0x10,0x20,0x40,0x98,0x18,0x0},
{0x40,0xA0,0x40,0xA8,0x90,0x98,0x60,0x0},
{0x10,0x20,0x40,0x0,0x0,0x0,0x0,0x0},
{0x10,0x20,0x40,0x40,0x40,0x20,0x10,0x0},
{0x40,0x20,0x10,0x10,0x10,0x20,0x40,0x0},
{0x20,0xA8,0x70,0x20,0x70,0xA8,0x20,0x0},
{0x0,0x20,0x20,0xF8,0x20,0x20,0x0,0x0},
{0x0,0x0,0x0,0x0,0x0,0x20,0x20,0x40},
{0x0,0x0,0x0,0x78,0x0,0x0,0x0,0x0},
{0x0,0x0,0x0,0x0,0x0,0x60,0x60,0x0},
{0x0,0x0,0x8,0x10,0x20,0x40,0x80,0x0},
{0x70,0x88,0x98,0xA8,0xC8,0x88,0x70,0x0},
{0x20,0x60,0xA0,0x20,0x20,0x20,0xF8,0x0},
{0x70,0x88,0x8,0x10,0x60,0x80,0xF8,0x0},
{0x70,0x88,0x8,0x30,0x8,0x88,0x70,0x0},
{0x10,0x30,0x50,0x90,0xF8,0x10,0x10,0x0},
{0xF8,0x80,0xE0,0x10,0x8,0x10,0xE0,0x0},
{0x30,0x40,0x80,0xF0,0x88,0x88,0x70,0x0},
{0xF8,0x88,0x10,0x20,0x20,0x20,0x20,0x0},
{0x70,0x88,0x88,0x70,0x88,0x88,0x70,0x0},
{0x70,0x88,0x88,0x78,0x8,0x10,0x60,0x0},
{0x0,0x0,0x20,0x0,0x0,0x20,0x0,0x0},
{0x0,0x0,0x20,0x0,0x0,0x20,0x20,0x40},
{0x18,0x30,0x60,0xC0,0x60,0x30,0x18,0x0},
{0x0,0x0,0xF8,0x0,0xF8,0x0,0x0,0x0},
{0xC0,0x60,0x30,0x18,0x30,0x60,0xC0,0x0},
{0x70,0x88,0x8,0x10,0x20,0x0,0x20,0x0},
{0x70,0x88,0x8,0x68,0xA8,0xA8,0x70,0x0},
{0x20,0x50,0x88,0x88,0xF8,0x88,0x88,0x0},
{0xF0,0x48,0x48,0x70,0x48,0x48,0xF0,0x0},
{0x30,0x48,0x80,0x80,0x80,0x48,0x30,0x0},
{0xE0,0x50,0x48,0x48,0x48,0x50,0xE0,0x0},
{0xF8,0x80,0x80,0xF0,0x80,0x80,0xF8,0x0},
{0xF8,0x80,0x80,0xF0,0x80,0x80,0x80,0x0},
{0x70,0x88,0x80,0xB8,0x88,0x88,0x70,0x0},
{0x88,0x88,0x88,0xF8,0x88,0x88,0x88,0x0},
{0x70,0x20,0x20,0x20,0x20,0x20,0x70,0x0},
{0x38,0x10,0x10,0x10,0x90,0x90,0x60,0x0},
{0x88,0x90,0xA0,0xC0,0xA0,0x90,0x88,0x0},
{0x80,0x80,0x80,0x80,0x80,0x80,0xF8,0x0},
{0x88,0xD8,0xA8,0xA8,0x88,0x88,0x88,0x0},
{0x88,0xC8,0xC8,0xA8,0x98,0x98,0x88,0x0},
{0x70,0x88,0x88,0x88,0x88,0x88,0x70,0x0},
{0xF0,0x88,0x88,0xF0,0x80,0x80,0x80,0x0},
{0x70,0x88,0x88,0x88,0xA8,0x90,0x68,0x0},
{0xF0,0x88,0x88,0xF0,0xA0,0x90,0x88,0x0},
{0x70,0x88,0x80,0x70,0x8,0x88,0x70,0x0},
{0xF8,0x20,0x20,0x20,0x20,0x20,0x20,0x0},
{0x88,0x88,0x88,0x88,0x88,0x88,0x70,0x0},
{0x88,0x88,0x88,0x88,0x50,0x50,0x20,0x0},
{0x88,0x88,0x88,0xA8,0xA8,0xD8,0x88,0x0},
{0x88,0x88,0x50,0x20,0x50,0x88,0x88,0x0},
{0x88,0x88,0x88,0x70,0x20,0x20,0x20,0x0},
{0xF8,0x8,0x10,0x20,0x40,0x80,0xF8,0x0},
{0x70,0x40,0x40,0x40,0x40,0x40,0x70,0x0},
{0x88,0x50,0x20,0x70,0x20,0x70,0x20,0x0},
{0x70,0x10,0x10,0x10,0x10,0x10,0x70,0x0},
{0x20,0x50,0x88,0x0,0x0,0x0,0x0,0x0},
{0x0,0x0,0x0,0x0,0x0,0x0,0xF8,0x0},
{0x40,0x20,0x10,0x0,0x0,0x0,0x0,0x0},
{0x0,0x0,0x70,0x8,0x78,0x88,0x78,0x0},
{0x80,0x80,0xB0,0xC8,0x88,0xC8,0xB0,0x0},
{0x0,0x0,0x70,0x88,0x80,0x88,0x70,0x0},
{0x8,0x8,0x68,0x98,0x88,0x98,0x68,0x0},
{0x0,0x0,0x70,0x88,0xF8,0x80,0x70,0x0},
{0x10,0x28,0x20,0xF8,0x20,0x20,0x20,0x0},
{0x0,0x0,0x68,0x98,0x98,0x68,0x8,0x70},
{0x80,0x80,0xF0,0x88,0x88,0x88,0x88,0x0},
{0x20,0x0,0x60,0x20,0x20,0x20,0x70,0x0},
{0x10,0x0,0x30,0x10,0x10,0x10,0x90,0x60},
{0x40,0x40,0x48,0x50,0x60,0x50,0x48,0x0},
{0x60,0x20,0x20,0x20,0x20,0x20,0x70,0x0},
{0x0,0x0,0xD0,0xA8,0xA8,0xA8,0xA8,0x0},
{0x0,0x0,0xB0,0xC8,0x88,0x88,0x88,0x0},
{0x0,0x0,0x70,0x88,0x88,0x88,0x70,0x0},
{0x0,0x0,0xB0,0xC8,0xC8,0xB0,0x80,0x80},
{0x0,0x0,0x68,0x98,0x98,0x68,0x8,0x8},
{0x0,0x0,0xB0,0xC8,0x80,0x80,0x80,0x0},
{0x0,0x0,0x78,0x80,0xF0,0x8,0xF0,0x0},
{0x40,0x40,0xF0,0x40,0x40,0x48,0x30,0x0},
{0x0,0x0,0x90,0x90,0x90,0x90,0x68,0x0},
{0x0,0x0,0x88,0x88,0x88,0x50,0x20,0x0},
{0x0,0x0,0x88,0xA8,0xA8,0xA8,0x50,0x0},
{0x0,0x0,0x88,0x50,0x20,0x50,0x88,0x0},
{0x0,0x0,0x88,0x88,0x98,0x68,0x8,0x70},
{0x0,0x0,0xF8,0x10,0x20,0x40,0xF8,0x0},
{0x18,0x20,0x20,0x40,0x20,0x20,0x18,0x0},
{0x20,0x20,0x20,0x0,0x20,0x20,0x20,0x0},
{0xC0,0x20,0x20,0x10,0x20,0x20,0xC0,0x0},
{0x40,0xA8,0x10,0x0,0x0,0x0,0x0,0x0},
{0,0,0,0,0,0,0,0}
};
extern unsigned char inp(unsigned char);
extern outp(unsigned char,unsigned char);
void VRegister(unsigned char reg, unsigned char data);
void VMemadr(long addr, char rw);
void Fontset(void);
void main(void){
long i;
int j;
//SCREEN8
VRegister(0,0xE);
VRegister(1,0x60);
//VDP DISPSCAN BASE ADDRESS(PATTERN NAME TABLE)
VRegister(2,0x1F);
//SPRITE OFF
VRegister(8,0xA);
//SET ADDRESS,WRITE MODE
VMemadr(0,1);
//WRITE VMEM(I/O DIRECT)
for(j=0; j<0xd3ff; j++){
outp(0x98,0);
}
//WAIT
for(i=0; i<300000; i++);
//RETURN SCREEN0(40)
VRegister(0,0);
VRegister(1,0x70);
//VDP DISPSCAN BASE ADDRESS
VRegister(2,0x0);
//SCREEN0(40) FONT RECOVER
Fontset();
}
//function(Register number, Data)
void VRegister(unsigned char reg, unsigned char data){
outp(0x99,data);
outp(0x99,reg+0x80);
}
//function(VMem Address, 0-Read/1-Write)
void VMemadr(long addr,char rw){
unsigned char low,mid,hi;
low=addr & 0xff;
mid=(addr >> 8) & 0x3f;
hi=(addr >>14) & 0x7;
//HI ADDR
outp(0x99,hi);
//R#14
outp(0x99,0x8e);
//LOW ADDR
outp(0x99,low);
//MID ADDR
if (rw) {
//WRITE
outp(0x99,mid+0x40);
}else{
//READ
outp(0x99,mid);
}
}
void Fontset(){
int i;
int j;
//CLEAR VFONT ALLOCATION
VMemadr(0x800,1);
for(i=0x800; i<0x1100; i++){
outp(0x98,0);
}
//SET VFONT ADDRESS
//(PATTERN GENERATOR TABLE,SCREEN0/WIDTH40)
VMemadr(0x900,1);
//WRITE FONT(ALPHABET ONLY)
for(i=0; i<96; i++){
for(j=0; j<8; j++){
outp(0x98,f[i][j]);
}
}
}
