Q-bus to CF [was: IOmega]

[Bob Armstrong]

>woodelf (bfranchuk at jetnet.ab.ca)

>The question is who is the interface for. Is this like the SCB1620
interface to provide
>a hard drive to a small system that may not have any other major storage
device,
>or is this for a commercial system that has a *Standard* I/O allready?

  Sorry, I disagree.  The target system hardware doesn't matter at all -
it's the target system _software_ that counts.  The SBC6120/PDP8 really has
only one viable disk operating system, so all I had to do was make that work
and the job was done.  The PDP-11 has many disk operating systems, and
there's even more if you plan on using this interface in a MicroVAX.  I
think we're just going in circles, though - somebody else already made this
point before me.

>Any ideas on how impliment POWER on fail IRQ and restore?

  Do you mean in the SBC6120?  Power fail isn't that complicated - it's just
a flag, a skip-on-flag IOT, and an interrupt.  It seems pointless, though,
since the SBC6120 doesn't have non-volatile main memory.  OTOH, the SBC6120
is so low power to start with that you could run it for days on a gel cell -
it'd be easier just to provide the whole system with a mini-UPS :-)

Bob