28 Jan
2002
28 Jan
'02
2:34 a.m.
William Donzelli wrote:
I do remember a lot of clocks to there. One thing that they may have
done
is run the raw data from the drives to the main disk controller. Getting
a IBM from that running if you had one could be hard because IBM had its
own logic chips. They also had computer generated schematic listings
too.
Since when are one-shots are a problem, they have
there place.
Thinking back more; most timing was asynchronous that needed
a lot set/reset flip flops and delay buffers to keep things in sync.
It is tricks to save a gate or two that is the problem.
It is not "the IBM way". Back in the 1960s and 1970s, IBM strongly tended
to have everything clocked, sometimes using rather impressive circuitry.
The clock generator of an S/3 is astoundingly complex, and gets around
some of the uncertainty involved with one-shots and delays. No, it was a real microcode machine. It could run a
set of complicated
diagnostics on a disk, without bothering the channel. Real front panel, too.
Likely the price of the CPU to. The IBM 1130 was meant still as cards
in/
cards out system.
--
Ben Franchuk - Dawn * 12/24 bit cpu *
www.jetnet.ab.ca/users/bfranchuk/index.html