[HECnet] Which is THE dec printer?

[Dave McGuire]

On 01/15/2014 06:42 PM, Cory Smelosky wrote:
A lot of people (myself included) insisted on direct-in-the-bus
printer controllers when we saw how badly serial printers tanked the
system when we connected them to DZ11s. ;)

Oh I can imagine that.   A dedicated controller would have MUCH higher
bandwidth than the <1.5mbitcapable on the DZ11. ;)

It's the interrupt load that's the problem.   It could TANK an 11/750.

Didn't the DZ11 depend on the CPU for interrupts?

  Every interrupt depends on the CPU. ;)

Isn't that why say...the DHV11 had processors to offload serial
processing to?

  The DHV11 has a pair of 8051s on it.   The DH11 is several boards full
of logic.   It has buffering and DMA capability to offload the host
system...it needs much less hand-holding than the DZ11.

                              -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA