3 Mar
2008
3 Mar
'08
2:37 p.m.
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