24 Oct
1999
24 Oct
'99
1:42 p.m.
<I certainly know for a fact that UNIBUS performed
very poorly. I don't hav
<data at my fingertips, but it seems to me it was around 10 Mb/s (that
<megabits/sec) peak throughput. [I prefer measuring throughputs in bits/se
<since that normalizes across different bus widths.]
Allison
I seem to remember real world Unibus was mentioned to be up to
1-1.2 Megabytes/second so your number may be right. I often wondered
if it really got that high in real life...
DZ11 interrupts, Ethernet on Deuna's... UDA50's and Massbuss adapters
really began to show the problems in the Unibus by the '80's.
You could outrun the RH11 and Unibus pretty easily with stuff like
the RP07's and RM05's... The Unibus was a great idea, but they needed
a Massbus->Memory interconnect that didn't use the Unibus
for stuff like the 11/44 to perform with reasonable storage loads...
The IBM boys knew that to make machines handle load you need big busses
that moved data in good size chunks.
Bill
---
bpechter@shell.monmouth.com|pechter@pechter.dyndns.org
Three things never anger: First, the one who runs your DEC,
The one who does Field Service and the one who signs your check.