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Now we need to patch the Main ISO. You will need to find the start of the CD Shell loader.bin file. Using a hex editor, try searching for "cdsh.bin" from the start of the iso image. From the start of the string "cdsh.bin", advance 32 bytes (you should be at the start of a line, two lines down from "cdsh.bin"). In this example, you would modify bytes 19FF0-19FF3:
19F80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19F90: 2F 62 6F 6F 74 00 00 00 00 00 00 00 00 00 00 00 /boot...........
19FA0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19FB0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19FC0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19FD0: 63 64 73 68 2E 62 69 6E 00 00 00 00 00 00 00 00 cdsh.bin........
19FE0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19FF0: 10 00 00 00 00 00 00 10 00 00 00 10 00 05 00 00 ................
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Now the next four bytes, which should be 10 00 00 00, need to be patched with the location of the Primary Volume Descriptor of the Boot ISO. This is typically the 16th sector into the ISO, so add 16 to the result you obtained above (to follow the example: 80 + 16 = 96). Now convert this number into 32-bit hexadecimal, and use it to patch the four bytes. Be sure to observe little-endian-ness. Here is an example of a large number being converted: (The size of main.iso for this example is 614,400,000 bytes)
614,400,000 bytes / 2048 bytes-per-sector = 300,000 sectors
300,000 sectors + 16 sectors = 300,016
300,016 -> Hex = 0x000493F0
0x000493F0 -> Little Endian = F0 93 04 00 After patching:
19F80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19F90: 2F 62 6F 6F 74 00 00 00 00 00 00 00 00 00 00 00 /boot...........
19FA0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19FB0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19FC0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19FD0: 63 64 73 68 2E 62 69 6E 00 00 00 00 00 00 00 00 cdsh.bin........
19FE0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
19FF0: F0 93 04 00 00 00 00 10 00 00 00 10 00 05 00 00 ð“ .............
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Finally, we will merge the two ISOs together. In DOS/Windows this can be achieved by using the following command:
copy /B main.iso + /B boot.iso /B full.iso
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Now test full.iso if you want to using BOCHS, Virtual PC, or VMware to make sure it works. If so then burn your CD or DVD and off you go.
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