> On Sep 1, 2018, at 12:28 PM, Clem Cole <cl...@ccc.com> wrote: > > below... > > On Sat, Sep 1, 2018 at 2:39 PM Zane Healy <heal...@avanthar.com > <mailto:heal...@avanthar.com>> wrote: > Create a virtual disk in SIMH the size of the CD-R blank. Prep the disk, > then burn it to CD-R. This is how I created my bootable CD’s for RT-11 and > RSX-11M+. I’ve then used those CD’s to do installs on my PDP-11/73. I > wasn’t able to figure out how to make it work in RSTS/E. I could create the > CD-R, but not boot and install RSTS/E from it. > > Just curious ... aren't there funnies because CD's are normally 1024 byte > blocks and disks are usually 512? IIRC, there are places that store > numbers of blocks (not bytes), and you have to be careful. I have >>not<< > played in any of that in years. > > IIRC one of things we might have done at DEC was mess with the block size on > a CD -- that's a Tim Litt type question. Those bits are so long ago > depreciated/garbage collected in my acitve brain cells. ;-) > ᐧ
I’ve not run into any issues, but come to think of it, the SCSI CD-ROM drive attached to my PDP-11/73 is capable of 512-byte blocks. IIRC, the older DEC HW, just like the older Sun HW requires 512-byte blocks. Zane
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