On Sun, 16 Mar 2003, Tony Duell wrote:
> So if the return character is not getting to the rails correctly then
> firstly it won't punch properly and secondly, it won't be detected by the
> approipriate lever in the function unit.
I haven't be able to verify what character is being produced because the
durn carriage is stuck on the right. Once I get the carriage returned
then I can determine what's going on.
> So let's get that missing bit back first. Are you running the machine in
> LOCAL mode (i.e. from its own keyboard to the printer?). If so, the
Yes, LOCAL mode.
> problem could be in the transmitter side (contacts on the keyboard, for
> example). Or it could be a problem in the RX unit (sticking lever). I
> think it's safe to assume that the solenoid driver is not the problem
> here (it's not going to mangle only one bit).
While I can't say I examined it to the point of ruling this out, I didn't
notice anything wrong with the levers. However, it is an obvious place to
start.
> Incidentally, the carriage is fed by the 'spacing mechanism' which drives
> the left hand sprocket for the toothed belt. At the bottom of this
> sprocket shaft, right against the casing, is the spacing ratchet with the
> pawls to move it on one character, and to allow it to be released for a
> carriage return. IIRC, _carefully_ frobbing levers in this area will
> release the pawls and allow the carriage to return.
I'll look into that. This is my primary concern as of now.
> > Whoever designed the ASR33 must have sold their soul to the devil to make
> > it all work. It's amazing how intricate and delicate everything is, and
> > how damn kludgy as well.
>
> I find them rather beautiful...
I agree, but I still can't believe this thing works and stays together as
it does considering how delicate all the parts are and how delicately
everything hangs in balance.
--
Sellam Ismail Vintage Computer Festival
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Received on Mon Mar 17 2003 - 11:04:00 GMT