mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-12-30 22:32:48 +00:00
120 lines
2.1 KiB
C
120 lines
2.1 KiB
C
#include <stdio.h>
|
|
|
|
int main(int argc, char **argv) {
|
|
|
|
int h[7],hpe;
|
|
int sum_a3,sum_a4,sum_a5,sum_a6;
|
|
int v[5],va,vb,vc;
|
|
int a[16],addr,i;
|
|
// hbl = horizontal blanking gate
|
|
int text=1,page1=1,page2=0,hbl=0;
|
|
int vcount=0;
|
|
int vline=0;
|
|
int refresh[128],ra[7],ras,refresh_cycles=0;
|
|
|
|
for(i=0;i<128;i++) refresh[i]=0;
|
|
|
|
while(1) {
|
|
h[0]=(vcount>>0)&1;
|
|
h[1]=(vcount>>1)&1;
|
|
h[2]=(vcount>>2)&1;
|
|
h[3]=(vcount>>3)&1;
|
|
h[4]=(vcount>>4)&1;
|
|
h[5]=(vcount>>5)&1;
|
|
hpe=(vcount>>6)&1;
|
|
va=(vcount>>7)&1;
|
|
vb=(vcount>>8)&1;
|
|
vc=(vcount>>9)&1;
|
|
v[0]=(vcount>>10)&1;
|
|
v[1]=(vcount>>11)&1;
|
|
v[2]=(vcount>>12)&1;
|
|
v[3]=(vcount>>13)&1;
|
|
v[4]=(vcount>>14)&1;
|
|
v[5]=(vcount>>15)&1;
|
|
|
|
|
|
/* First 25 cycles */
|
|
hbl=!h[5]&&(!h[3]||!h[4]);
|
|
|
|
int x,y,z,sum;
|
|
x=0xd; // 1101
|
|
y=(h[5]<<2)|(h[4]<<1)|(h[3]);
|
|
z=(v[4]<<3)|(v[3]<<2)|(v[4]<<1)|(v[3]);
|
|
sum=x+y+z;
|
|
|
|
sum_a6=(sum>>3)&1;
|
|
sum_a5=(sum>>2)&1;
|
|
sum_a4=(sum>>1)&1;
|
|
sum_a3=(sum)&1;
|
|
|
|
a[0]=h[0];
|
|
a[1]=h[1];
|
|
a[2]=h[2];
|
|
a[3]=sum_a3;
|
|
a[4]=sum_a4;
|
|
a[5]=sum_a5;
|
|
a[6]=sum_a6;
|
|
a[7]=v[0];
|
|
a[8]=v[1];
|
|
a[9]=v[2];
|
|
a[10]=text&page1;
|
|
a[11]=text&page2;
|
|
a[12]=text&hbl;
|
|
a[13]=0;
|
|
a[14]=0;
|
|
a[15]=0;
|
|
|
|
ra[0]=v[0];
|
|
ra[1]=h[2];
|
|
ra[2]=h[0];
|
|
ra[3]=v[1];
|
|
ra[4]=sum_a3; // sum0?
|
|
ra[5]=h[1];
|
|
ra[6]=hbl;
|
|
|
|
ras=0;
|
|
for(i=0;i<7;i++) ras|=(ra[i]<<i);
|
|
// printf("RAS: %d\n",ras);
|
|
|
|
refresh[ras]=1;
|
|
|
|
int refreshed=0;
|
|
for(i=0;i<128;i++) refreshed+=refresh[i];
|
|
// printf("REFRESHED= %d\n",refreshed);
|
|
|
|
if (refreshed==128) {
|
|
printf("*** DONE REFRESHING %d ***\n",
|
|
refresh_cycles);
|
|
for(i=0;i<128;i++) refresh[i]=0;
|
|
refresh_cycles=0;
|
|
}
|
|
|
|
addr=0;
|
|
for(i=0;i<15;i++) addr|=(a[i]<<i);
|
|
printf("%04x ",addr);
|
|
|
|
/* horizontal divide by 65 counter */
|
|
/* values are 000.0000 and 100.0000-111.1111 */
|
|
if ((vcount&0x7f)==0) {
|
|
vcount|=0x40;
|
|
printf("\nRestart H, V=%d\n",vline);
|
|
vline++;
|
|
}
|
|
else {
|
|
vcount++;
|
|
}
|
|
|
|
/* vertical divide by 262 */
|
|
if ((vcount&0xff80)==0) {
|
|
vcount|=0x7d00; // 0.1111.1010
|
|
// 0111.1101.0000.0000
|
|
vline=0;
|
|
printf("Restart V\n");
|
|
}
|
|
|
|
refresh_cycles++;
|
|
}
|
|
|
|
return 0;
|
|
}
|