25 Jul
2011
25 Jul
'11
1:22 p.m.
In article <20110725093548.de68acc7.jkunz at unixag-kl.fh-kl.de>,
Jochen Kunz <jkunz at unixag-kl.fh-kl.de> writes:
On Sun, 24 Jul 2011 19:38:36 -0600
Richard <legalize at xmission.com> wrote:
This could mean that you have a disconnect somewhere between the
keyboard and the rest of the circuitry, which means its not hearing
your PAGE keystrokes.
So pressing the PAGE key does nothing?
Nothing.
That should clear the screen.
It should,
but it doesn't.
How long did you let it warm up before concluding
that the screen
won't clear?
A few minutes.
I'd give it 30 minutes before reaching a
conclusion that
its horked for good.
I did this now but it didn't change anything. My 4006-1
needs less then
a minute to be usable. I typed on the keyboard in local mode, nothing
happens. I placed a loop back connection on the RS232 in line
mode,
nothing happens. At least I get some garbled characters on my computer
when I connect the terminal. (I tried baud rates from 2400 to 38400.)
So it is not completely dead. Unfortunately bitsavers has docs on the
4010 and 4014, but not the 4012.
Look at the 4010 service manual and compare the board numbers to those
in your machine. The 4012 is not *that* different from a 4010 and
probably shares some boards in common with the 4010. A 4010 only does
9600 baud max IIRC, so you should check the strap/knob settings on the
4012 to determine the right baud rate. Its probably set for 300 or
1200 baud.
I wouldn't give up on this terminal just yet. The 401x machines are
all small-scale integration fixed logic, no microprocessor and no
microcode. Just simple state machines and logic. I've studied the
diagrams and its not that complicated if you just take some time to
study it and work through the problem logically.
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