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1 /* makerom.c
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2 Read standard input as S-records and build ROM image file v09.rom
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3 ROM starts at 0x8000 and is 32K.
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4 */
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5
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <strings.h>
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9
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10 static int sum,charindex;
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11 unsigned char mem[0x8000];
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12 char linebuf[130];
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13
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14 void
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15 hexerr()
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16 {
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17 fprintf(stderr,"Illegal character in hex number\n");
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18 exit(1);
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19 }
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20
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21 int gethex()
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22 {
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23 int c;
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24 c=linebuf[charindex++];
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25 if(c<'0')hexerr();
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26 if(c>'9') { if(c<'A')hexerr();else c-=7; }
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27 c-='0';
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28 return c;
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29 }
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30
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31 int getbyte()
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32 {
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33 int b;
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34 b=gethex();
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35 b=b*16+gethex();
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36 sum=(sum+b)&0xff;
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37 return b;
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38 }
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39
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40 int
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41 main()
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42 {
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43 FILE *romfile;
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44 unsigned int i,length,addr;
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45 for(i=0;i<0x8000;i++)mem[i]=0xff; /*set unused locations to FF */
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46 for(;;) {
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47 if(fgets(linebuf,128,stdin)==NULL)break;
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48 if(strlen(linebuf))linebuf[strlen(linebuf)]=0;
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49 if(linebuf[0]=='S'&&linebuf[1]=='1') {
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50 sum=0;charindex=2;
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51 length=getbyte();
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52 if(length<3) {
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53 fprintf(stderr,"Illegal length in data record\n");
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54 exit(1);
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55 }
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56 addr=getbyte();
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57 addr=(addr<<8)+getbyte();
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58 if((long)addr+length-3>0x10000||addr<0x8000) {
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59 fprintf(stderr,"Address 0x%x out of range\n",addr);
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60 exit(1);
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61 }
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62 for(i=0;i!=length-3;i++)mem[addr-0x8000+i]=getbyte();
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63 getbyte();
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64 if(sum!=0xff) {
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65 fprintf(stderr,"Checksum error\n");
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66 exit(1);
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67 }
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68 }
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69 }
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70 romfile=fopen("v09.rom","wb");
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71 if(!romfile) {
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72 fprintf(stderr,"Cannot create file v09.rom\n");
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73 exit(1);
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74 }
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75 fwrite(mem,0x8000,1,romfile);
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76 fclose(romfile);
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77 exit(0);
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78 }
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