[Simh] RRD40 emulation problem

[del121 at cinci.rr.com]

---- Tim  Shoppa <tshoppa at wmata.com> wrote: 
> This might be a silly question... but why specifically try
> to emulate the RRD40? 

Are you asking me personally? I would guess that the authors decided that emulating a supported cdrom device was important, given dec/hp distribution practices.

> Isn't attaching the ODS-2 disk
> image up as any kind of MSCP disk the moral equivalent for just
> about any purpose?

No. Among other things, when a disk is init'd, bitmap.sys is sized to reflect the available blocks, so if a disk (image) was init'd on type 'A' drive and then attached to type 'B' drive, things obviously ain't right (as ANA/DISK will report).

> 
> Is it possible that your ripping attempts are mangling
> the BITMAP.SYS or some pointer to it? I have seen Windows
> imaging tools fail pretty badly with ODS-2 structures
> when all I had to do was go to a Linux box and use dd
> if=/dev/cdrom of=out.dsk to make a good image.
> 

The rip is 'good'. I verified it a couple differant ways.
I'm pretty sure this is a simulation issue...

Regards...