Re: KA410 Boot Failure With TKZ-50

[Johnny Billquist <bqt%update.uu.se@localhost>]

On 2020-06-14 14:01, Anders Magnusson wrote:
> > > P.S. Here's something I can't remember, quite.  The KA410 also has an
> > > onboard controller for an ST506 hard drive.  Does _that_ emulate MSCP?
> >
> > My recollection says that the whole disk format was done in software, 
> > to be compatible with the RQDX3. And looking in NetBSD, it looks like 
> > it has a simpler interface than MSCP for the disks on that controller. 
> > (But I could be looking at the wrong thing...)
> The VS2k had a HDC9224 ST506 controller, programmed as ST506 controllers 
> were at that time :-)
> It also had a NCR5380 for SCSI, and same here - just a normal SCSI 
> controller, programmed directly.
>
> Both of these had their own DMA area which were not in main memory, so 
> data had to be copied to its destination.

Thanks. That confirms what I thought I remembered as well as what I was 
seeing in the code. And also answers Thor's question.

  Johnny

--
Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt%softjar.se@localhost             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol