12 Mar
2010
12 Mar
'10
5:14 p.m.
From: jdbryan at acm.org
On Wednesday, March 10, 2010 at 9:28, dwight elvey wrote:
Hi Dave
This is good info. I was thinking of using it intially with a GPIB board in my
PC. Speed would be no issue here since it will self throttle.
I was hoping to get it running with one of the newer 9000 series drives.
I hope these are buffered.
Dwight
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I don't have a 12821, it is a 59310. It
should work for most any HP-IB
thought.
One difference is that the 59310 is about 1/2 as fast: 470 KB/sec with
standard memory and 570 KB/sec with high-performance memory. The 12821 is
buffered, so DCPC can steal every I/O cycle vs. every other I/O cycle for
the 59310. Speed is 937 KB/sec. (Source: HP 1000/9000 Interface Products
Specification Guide, 5954-6312, August 1985.)
I suspect that if an unbuffered drive is used with the 59310, overrun
errors would occur. If they didn't, performance may be terrible, as you
might incur a one-rotation latency for each sector, unless the drive format
was interleaved.
The 12821 was the interface supported for hard drive connections under RTE;
the 59310 was positioned as an instrumentation controller.
-- Dave