CDC transistor boards

William Donzelli wdonzelli at
Sat Dec 29 13:21:33 CST 2018

Don't let the (very few) online pictures of early 1700s (1704 and
1706) fool you - the things have a *lot* of modules when the options
are added. It might be that while the 6000 series followed the Cray
"simple/fewer" design philosophy, the 1700 line may not have.


On Sat, Dec 29, 2018 at 2:10 PM Chuck Guzis via cctalk
<cctalk at> wrote:
> On 12/29/18 10:47 AM, William Donzelli via cctalk wrote:
> > Statistically, it is more likely to be a 1700 module (a more common
> > machine). The front bracket is missing, which is the easy way to
> > distinguish the two types.
> That's an interesting observation, but I'm not sure I'd agree with you.
> While there were more 1700s in circulation, the sheer number of modules
> used in 6000/Cyber machines and peripherals might tilt the balance the
> other way.
> --Chuck

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