On Tue, Nov 29, 2016 at 12:54 PM, Toby Thain <t...@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.
