29 Nov
2016
29 Nov
'16
6:24 p.m.
On Tue, Nov 29, 2016 at 12:54 PM, Toby Thain <toby at telegraphics.com.au> wrote:
On 2016-11-29 12:22 PM, Noel Chiappa wrote:
>
> > From: Peter Coghlan
>
> > Can anyone suggest an existing, simple QBUS device that I could
> study
> > the documentation of to figure out what a basic QBUS device needs to
> > have and to give me some ideas on how to implement one?
>
> Depends. Do you want to be able to do interrupts? Do you want to be able
> to
> do DMA? Each is a significant increment in complexity.
>
> Later DEC QBUS devices may not be the best things to look at, since they
> tend
> to use special DEC QBUS control chips (I'm _not_ talking about bus
> transceiver chips here) which are of course no longer available.
The DEC Chipkit documentation has the internal schematics for the
standard DEC interface chips and is very much worth a read.