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0
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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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151
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9 #include <string.h>
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0
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10
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11 static int sum,charindex;
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12 unsigned char mem[0x8000];
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13 char linebuf[130];
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14
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15 void
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16 hexerr()
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17 {
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18 fprintf(stderr,"Illegal character in hex number\n");
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19 exit(1);
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20 }
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21
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22 int gethex()
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23 {
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24 int c;
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25 c=linebuf[charindex++];
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26 if(c<'0')hexerr();
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27 if(c>'9') { if(c<'A')hexerr();else c-=7; }
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28 c-='0';
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29 return c;
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30 }
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31
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32 int getbyte()
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33 {
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34 int b;
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35 b=gethex();
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36 b=b*16+gethex();
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37 sum=(sum+b)&0xff;
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38 return b;
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39 }
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40
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41 int
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42 main()
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43 {
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44 FILE *romfile;
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45 unsigned int i,length,addr;
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46 for(i=0;i<0x8000;i++)mem[i]=0xff; /*set unused locations to FF */
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47 for(;;) {
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48 if(fgets(linebuf,128,stdin)==NULL)break;
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49 if(strlen(linebuf))linebuf[strlen(linebuf)]=0;
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50 if(linebuf[0]=='S'&&linebuf[1]=='1') {
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51 sum=0;charindex=2;
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52 length=getbyte();
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53 if(length<3) {
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54 fprintf(stderr,"Illegal length in data record\n");
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55 exit(1);
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56 }
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57 addr=getbyte();
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58 addr=(addr<<8)+getbyte();
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59 if((long)addr+length-3>0x10000||addr<0x8000) {
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60 fprintf(stderr,"Address 0x%x out of range\n",addr);
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61 exit(1);
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62 }
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63 for(i=0;i!=length-3;i++)mem[addr-0x8000+i]=getbyte();
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64 getbyte();
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65 if(sum!=0xff) {
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66 fprintf(stderr,"Checksum error\n");
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67 exit(1);
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68 }
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69 }
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70 }
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71 romfile=fopen("v09.rom","wb");
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72 if(!romfile) {
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73 fprintf(stderr,"Cannot create file v09.rom\n");
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74 exit(1);
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75 }
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76 fwrite(mem,0x8000,1,romfile);
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77 fclose(romfile);
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78 exit(0);
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79 }
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