Pinout for SED9421

[Tony Duell]

> 
> On 11/27/2005 at 9:02 PM ard at p850ug1.demon.co.uk wrote:
> 
> >Have you come across the DEC LA100 (or LA210) that 'dip' the head 
> >mechanically to get the half dot spacing?
> 
> Nope, but sounds logical.  The Durango uses an 18" wide HP ribbon cartridge

>From waht I remember there were a pair of solenoids, one each side of the 
carriage, connected in series (maybe in parallel, but at least there were 
only 2 wires back to the logic board). The armature was a permanent 
magnet with a groove round it. Passing a pulse one way through the coils 
sent the armature to one side, a pulse the other way sent it to the other 
side. In one postiion the printhead was a little lower due to the groove.

FWIW, the LA100 is nowhere near as mechanically well-built as the Sanders.

> with the 3/4" ribbon in it, driven via a cable and a unidirectional clutch
> through the carriage motor.  The ribbon spans the entire page, but is
> slanted, so the entire surface is used while printing.   There's no 2-color
> ribbon facility as there is on the daisywheels.

The Sanders 12/7  uses a film ribbon on a spool. It fits on one side of 
the chassie, the ribbon runs round pulleys (and across the front of the 
head, then round that motion-detector roller I mentioned and onto the 
takeup spool on the other side of the chassis.. I had a fair number of 
problems with insufficient tension and the ribbon falling off its guides.

The 700 takes the Diablo HiType/630 film ribbon cartridge (I have never 
tried a fabric ribbon, and don't intent to for fear of damaging the 
printhead pins). 

In both cases there's no colorchnage mechnaism. It's strictly black-only.

-tony