[cctalk] Re: Help? Programming SCM90448 EPROMs

[jos via cctalk]

Gents, please be aware of the WSI 57C49 Eprom, 8Kx8 in a 24 pin DIP
It can go low as 25nS access time.

Note that addresslines A10,A11 and A12 are swapped, so the contents needs to be 
moved accordingly.
I used the C program below to create replacements for some Tektronix 4052 ROMS


Jos





#include <stdio.h>
#include <stdlib.h>

/*
 * radapt <rominage>
 *
 * quick hack to transpose rom inages from mk36000 to wsi57c49
 * These are pincombatible except for A10, A11 and A12
 *
 */

#define        K8 8192
#define        K1 1024

unsigned char in[K8], out[K8];

void move(int a, int b)
{ int i;
printf("%d %d\n",a,b);
for (i=0;i<K1;i++)
 out[b*K1+i]=in[a*K1+i];

}


int main(int argc,char *argv[])
{
  int i=0;

  int c;
  FILE *fptr;



  fptr=fopen(argv[1],"rb");
    { if (!fptr)
           printf("Unable to open file %s\n",argv[1]);
          else
      { while( (c=fgetc(fptr)) !=EOF )
          { in[i]=c; i++;}
        fclose(fptr);
        if (i!=K8)
            {  printf("incorrect input file size, must be %d, not %d\n",K8,i);
               exit(-1); }
            move(0,0);
            move(1,2);
            move(2,4);
            move(3,6);
            move(4,1);
            move(5,3);
            move(6,5);
            move(7,7);
            fptr=fopen("out.bin","w");
            for (i=0;i<K8;i++)
              fputc(out[i],fptr);
            fclose(fptr);
       printf("Output file out.bin written\nmv out.bin %s\n",argv[1]);
    };
  };
}