VAX? or PDP-11? You bet the judge.

From: Eric Smith <>
Date: Wed Jan 19 18:37:21 2005

Sellam wrote:
> So, Geoff thinks this is an 11/33. I've never even heard of an 11/33.
> But there you have it. I've done my part.

It's an 11/53. That's the low end of the J11-based Qbus PDP-11 product
line. Though it's still significantly faster than an 11/23 (F11 chipset).

The J11 chip has capabilities roughly comparable to a PDP-11/70, the
biggest and most powerful TTL-based PDP-11 CPU that shipped as a product.
The J11 has microcoded floating point, but can optionally use a separate
floating point coprocessor chip; I'm not sure whether the 11/53 can
accomodate that chip.

Qbus J11 systems included the 11/53, 11/73, 11/83, and 11/93. The
main differences are the cache size (or absence), the clock frequency,
support for the floating-point coprocessor chip, and the amount of
main memory present on the CPU board (none for the 11/73 and 11/83).

The J11 was also used in the 11/84 and 11/94 Unibus systems, which are
the Unibs equivalents of the 11/83 and 11/93.

The J11 was used in the Pro 380 personal computer, and was used as an
embedded processor in many DEC devices, including the HSC60, HSC90, and
HSC95 storage controllers.

Received on Wed Jan 19 2005 - 18:37:21 GMT

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