Chip Upgrades for 11/23 (was Re: 11/03 system on eBay sold)

From: <(>
Date: Thu Jan 9 12:58:00 2003

On Jan 9, 11:36, Frank Arnold wrote:

> I wonder, EIS/FIS chip as well as CIS are basicalley Roms that expand the
> microcode control store of the F-11 microprocessor. True?

Almost. They are ROMs, but EIS/FIS is for the 11/03 KD11 processor, not
the F-11 family. CIS is a set of microcode ROMs for the F-11.

There's quite a lot of information in the KDF11 CPU Module User Guide, and
probably more in a technical manual. Basically, it seems that the the
microcode is stored in a device with two bidirectional 16-bit busses (MIB
and CDAL). MIB is a multiplexed bus. Part of the time it outputs the
current microinstruction and the rest of the time it receives control
signals from the CPU. The CDAL bus (which is actually a 22-bit bus, but
only 16 bits are presented to the option sockets) is what eventually
connects to the external BDAL bus, but it's also used internally for
control signals.

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Thu Jan 09 2003 - 12:58:00 GMT

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