[Simh] SCSI-Interface for simh-vax?

[Zane Healy]

> On Sep 1, 2018, at 12:28 PM, Clem Cole <clemc at ccc.com> wrote:
> 
> below...
> 
> On Sat, Sep 1, 2018 at 2:39 PM Zane Healy <healyzh at avanthar.com <mailto:healyzh at 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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