>Doc wrote:
> Haven't tried my CD-RW on a non-Intel box as boot device, but I know
> that the 512-byte boot block is not the only issue. For instance, I
> have a Sony 8x reader with an IBM "microcode upgrade" that will boot my
> SparcStation, every RS6k I own, and my Alphas, ***unless*** it's a
> VMS/OpenVMS CD. The BabyVAXen also won't boot off it. The Indy won't.
> OTOH, My Plextor 32x, May It Rest In Peace (I dropped it!), would boot
> all the above except VMS CDs.
> I know that early RS/6000s did some sense checking that narrowed the
> field considerably. I _guess_ that VMS does the same. About the rest,
> I'm clueless.
> Back to reading 512-byte blocks, both my old TEAC 55R and my new
> Yamaha SCSI CDRW have a jumper to allow 512-byte reads, as do most of
> the better SCSI readers.
Jerome Fine replies:
I have a VERY old SCSI CDROM drive which seems to be able to
recognize 512 byte blocks, although I have not made a final test. It
does not recognize a CD-RW media, but I have tested it with a CD-R
that I used when I made a copy of my backup files for the complete
system.
I am using Windows 98 (which I dislike), but the Ersatz-11 emulator
runs very well under Windows 98, so I don't have a choice if I want
to run my PDP-11 programs under this emulator.
By the end of the month, I will make a copy of a bootable set of files
on a CD-R and test the SCSI CDROM drive to see if it will boot RT-11.
I do have one question for a problem I don't have a solution for. Tim
Shoppa made an RT-11 Freeware CD with files under the ISO file
structure at the beginning of the CD and other files under the RT-11
files structure at the end of the CD. Somehow (probably on a VAX
or an Alpha under VMS), he was able to master a CD with both
file structures. The essence is that there are 114,688 sectors (of 2048
bytes each or 7 RT-11 partitions of 33,554,432 bytes each) starting
at sector 212,992 (which is 13 * 16,384 sectors from the start) on
the CD.
Does anyone know of a program which will work under Windows 98
that can copy a file from the hard disk to the CD starting at a specified
sector on the CD rather than sector zero on the CD?
Sincerely yours,
Jerome Fine
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Received on Tue Apr 09 2002 - 21:59:54 BST