Possible to Re-flash a Yamaha SCSI CDROM to fake an Apple CDROM ?
rescue at hawkmountain.net
Wed Jun 15 16:13:47 CDT 2016
Didn't hacked or 3rd party cd-rom drivers exist. That won't handle the
boot problem, but the boot checks might not be as thorough as Disk Setup
Plextor CD-ROM SCSI drives used to have a 512 byte block jumper as
well. I don't know about the DVD drives.
On 2016-06-15 16:45, Swift Griggs wrote:
> On Wed, 15 Jun 2016, ethan at 757.org wrote:
>> I'm not sure if it has anything to do with it, but over on the early
>> and Sun and NeXT stuff you had to change the block size on the
>> CD-ROM to
>> get them to work.
> Yeah, I think you mean the 2048 vs 512 byte block size. SGI's use a
> byte size, IIRC. Folks were just talking about that a few weeks back,
>> The early Toshiba drives had solder pads that could be split open or
>> re-closed to change block sizes and such to get them to work on all
>> the different hardware types.
> Most SCSI-based Yamaha and Pioneer drives have a jumper you can set
> it. However, I tried this with my Pioneer SCSI CDROM and it still
> work. I guess if nobody knows I can figure out how to run a
> debugger/syscall-profiler of some kind on MacOS 8.1 and fire up Disk
> and see what it's actually looking for. My guess is it's just
> checking to
> make sure the SCSI vendor ID is "Apple" and then happily goes on with
> job. However, I just don't know for sure yet.
> I also don't know if altering a ROM image like that would have
> effects if, for example, the ROM image is appended with a CRC32
> that will fail once I flash it with a hacked image. I also am not
> sure if
> I can find the right spot in the firmware image to do the byte-patch.
> of unknowns, so that's why I'm seeking the advice.
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