DEC RK05F videos and pictures - running it naked!

Johnny Billquist bqt at
Fri Apr 16 06:10:50 CDT 2010

ard at (Tony Duell) wrote:

>> Oh, that bad RK8E controller just confronts me with "Data break error" :-(
> IIRC a ;'data break' is a bit like DMA. I do haev the prints and some 
> technical desription, so I could help you debug this sometime...

Just for reference: databreak is exactly just DMA. It's just another 
name for it. The "fun" part of the PDP-8 is that you have 1-cycle data 
break and 3-cycle data break devices... :-)
You never see the 3-cycle version on any modern DMA devices...


More information about the cctech mailing list