C code that generates a small console app to check Macintosh Old World ROM files.

gistfile1.c

//
//  ROMTest.c
//  ROMTest
//
//  Created by Giancarlo Mariot on 04/11/2013.
//  Copyright (c) 2013 Giancarlo Mariot. All rights reserved.
//
//  Adapted from C++ code by Dennis Nedry.
//  Reference: http://68kmla.org/forums/viewtopic.php?f=15&t=12920
//

#include <stdio.h>
#include <string.h>

int main(int argc, const char * argv[]) {
    
    if (argc < 2) {
        printf("\nUsage: ROMTest [path to ROM file]\n");
        return 0;
    }
    
    char filePath[512];
    snprintf(filePath, 512, "%s", argv[1]);
    
    printf("Checking file:\n%s\n", filePath);

    FILE * f;
    f = fopen(filePath, "r");
    
    unsigned int sum = 0;
    long int length = 0;
    
    while (getc(f) != EOF) {
        length++;
    }
    
    printf("\nROM Length: %f kiB\n", length/1024.0);
    
    if (length % 65536 != 0)
        printf("The ROM appears to be the wrong length.\n");  // Checks if the file size is divisible by 64kiB
    
    fclose(f);
    
    f = fopen(filePath, "r");
    
    unsigned int recorded = getc(f)*16777216+getc(f)*65536+getc(f)*256+getc(f);
    
    printf("\nRecorded Checksum: 0x%X", recorded);
    
    for (int i=4; i<length; i+=2) {
        sum += getc(f) * 256;
        sum += getc(f);
    }
    
    printf("\nComputed Checksum: 0x%X\n", sum);
    //cout << hex << "\nComputed Checksum: 0x" << sum << endl;
    
    if (recorded == sum) printf("\nROM Checksum PASSED.\n");
    else printf("\nROM Checksum FAILED.\n");
    
    printf("\nThe mac with this ROM is ");
    
    switch (recorded) {
        //------------------------------------------------
        // 64 KB
        case 0x28BA61CE:
            printf("Macintosh 128");
            break;
        case 0x28BA4E50:
            printf("Macintosh 512K");
            break;
        //------------------------------------------------
        // 128 KB
        case 0x4D1EEEE1:
            printf("Macintosh Plus v1 Lonely Hearts");
            break;
        case 0x4D1EEAE1:
            printf("Macintosh Plus v2 Lonely Heifers");
            break;
        case 0x4D1F8172:
            printf("Macintosh Plus v3 Loud Harmonicas");
            break;
        //------------------------------------------------
        // 256 KB
        case 0x97851DB6:
            printf("Macintosh II v1");
            break;
        case 0xB2E362A8:
            printf("Macintosh SE");
            break;
        case 0x9779D2C4:
            printf("Macintosh II v2");
            break;
        case 0xB306E171:
            printf("Macintosh SE FDHD");
            break;
        case 0x97221136:
            printf("Macintosh IIx, IIcx, SE/30");
            break;
        case 0x96CA3846:
            printf("Macintosh Portable");
            break;
        case 0xA49F9914:
            printf("Macintosh Classic (XO)");
            break;
        case 0x96645F9C:
            printf("Macintosh PowerBook 100");
            break;
        //------------------------------------------------
        // 512 KB
        case 0x4147DD77:
            printf("Macintosh IIfx");
            break;
        case 0x350EACF0:
            printf("Macintosh LC");
            break;
        case 0x3193670E:
            printf("Macintosh Classic II");
            break;            
        case 0x368CADFE:
            printf("Macintosh IIci");
            break;
        case 0x36B7FB6C:
            printf("Macintosh IIsi");
            break;
        case 0x35C28F5F:
            printf("Mac LC II or Performa 400/405/410/430");
            break;
        case 0x4957EB49: 
            printf("Mac IIvx (Brazil) or IIvi/Performa 600");
            break;
        //------------------------------------------------
        // 1024 KB
        case 0x420DBFF3:
            printf("Quadra 700/900 or PowerBook 140/170");
            break;
        case 0x3DC27823:
            printf("Macintosh Quadra 950");
            break;
        case 0xE33B2724:
            printf("Powerbook 160/165/165c/180/180c");
            break;
        case 0xECFA989B:
            printf("Powerbook 210/230/250");
            break;
        case 0xEC904829:
            printf("Macintosh LC III");
            break;
        case 0xECBBC41C:
            printf("Macintosh LCIII/LCIII+ or Performa 460");
            break;
        case 0xECD99DC0:
            printf("Macintosh Color Classic / Performa 250");
            break;
        case 0xF1A6F343:
            printf("Quadra/Centris 610 or 650");
            break;
        case 0xF1ACAD13:
            printf("Quadra/Centris 610 or 650 or 800");
            break;
        case 0x0024D346:
            printf("Powerbook Duo 270C");
            break;
        case 0xEDE66CBD:
            printf("Color Classic II, LC 550, Performa 275/550/560, Mac TV");
            break;
        case 0xFF7439EE:
            printf("LC 475/575 Quadra 605 Performa 475/476/575/577/578");
            break;
        case 0x015621D7:
            printf("Powerbook Duo 280 or 280C");
            break;
        case 0x06684214:
            printf("LC/Quadra/Performa 630");
            break;
        case 0xFDA22562:
            printf("Powerbook 150");
            break;
        case 0x064DC91D:
            printf("LC/Performa 580/588");
            break;
        //------------------------------------------------
        // 2MB ROMs
        // 2048 KB
        case 0xB6909089:
            printf("PowerBook 520/520c/540/540c");
            break;
        case 0x5BF10FD1:
            printf("Macintosh Quadra 660av or 840av");
            break;
        case 0x4D27039C:
            printf("PowerBook 190 or 190cs");
            break;
        //------------------------------------------------
        // 4MB
        case 0x9FEB69B3:
            printf("Power Mac 6100/7100/8100");
            break;
        case 0x9C7C98F7:
            printf("Workgroup Server 9150 80MHz");
            break;
        case 0x9B7A3AAD:
            printf("Power Mac 7100 (newer)");
            break;
        case 0x63ABFD3F:
            printf("Power Mac & Performa 5200/5300/6200/6300");
            break;
        case 0x9B037F6F:
            printf("Workgroup Server 9150 120MHz");
            break;
        case 0x83C54F75:
            printf("PowerBook 2300 & PB5x0 PPC Upgrade");
            break;
        case 0x9630C68B:
            printf("Power Mac 7200/7500/8500/9500 v2");
            break;
        case 0x96CD923D:
            printf("Power Mac 7200/7500/8500/9500 v1");
            break;
        case 0x6F5724C0:
            printf("PowerMac/Performa 6400");
            break;
        case 0x83A21950:
            printf("PowerBook 1400, 1400cs");
            break;
        case 0x6E92FE08:
            printf("Power Mac 6500");
            break;
        case 0x960E4BE9:
            printf("Power Mac 7300/7600/8600/9600 (v1)");
            break;
        case 0x960FC647:
            printf("Power Mac 8600 or 9600 (v2)");
            break;
        case 0x78F57389:
            printf("Power Mac G3 (v3)");
            break;
        case 0x79D68D63:
            printf("Power Mac G3 desktop");
            break;
        case 0xCBB01212:
            printf("PowerBook G3 Wallstreet");
            break;
        case 0xB46FFB63:
            printf("PowerBook G3 Wallstreet PDQ");
            break;
        //------------------------------------------------
        // New World ROM
        case 0x3C434852:
            // Must use MD5 here, in the near future...
            printf("Mac OS ROM 1.X");
            break;
        //------------------------------------------------
        // Unknown
        default:
            printf("unknown");
    }
    printf(".\n");
    
    return 0;

}