AMSYS29 floppies

allison ajp166 at
Tue Nov 23 15:59:01 CST 2010

On 11/23/2010 01:32 PM, Shoppa, Tim wrote:

t in an F11-based PDP-11 (11/23 or 11/24).

> Off the top of my head... DEC also has 2901's in the CI780, and the UDA50, and probably
> A bunch of other peripherals/interconnects/host adapters I cannot recall at the moment.
> Tim.
They were used in the RX02 as well.


There are 17 registers, 16 of which are addressable (RAM) and there is a 
Q register that can be
used as accumulator.  Both the Ram and the Q paths have shifters in them 
and since the
alu can take data from ram and Q it makes sense that it can so 32bit 
floating point with
modest external logic.

However the 2909/10/11 microprogram sequencers are not required.  It's 
possible to do
a fast (10mhz range) 4bit dedicated math processor or a lot of other things.

I still have maybe 16 of the 2901C (imox process) parts.


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