help - 11/34 console problem -- CNTRL key behaviour
henk.gooijen at oce.com
Thu Nov 10 06:25:03 CST 2005
> Never seen a dead 8008. I thought I'd killed one (at $180 then!)
> by installing it backward and then tossed it on the floor in the
> engineering lab. some days later after pulling from the bottom
> of my shoe I tried it again and it was still alive.
Amazing, but I will not try to repeat it to test your story :-)
> The ram however is definately suspect. But I've seen IO
> messups with 8008 and with scanned displays and keyboards are
> harder to look at.
This weekend I will check the RAMs!
> It would be goof if you could run a different program and see
> it's results.
> We used a set of ROMs all different to test. They were short
> programs that would either loop or do something and halt. For
> example we had one that would write (this was a time display)
> 00:00:00 then increment all the displays without doing
> anything else. Another would write a 8 tot he last display
> and halt. the most useful ones were those that would
> repeatedly loop input or output to a port. Very handy as
> back (1973) then logic analysers were not to be had and a
> 15mhz dual trace scope was the usual tool.
I checked the contents of the ROMs (from the listing). They are
quite filled, there is no room to show a clock on the display.
Would be fun, because once the 11/34 runs, the display is not
very exciting any more ...
Pity that the ROMs are soldered on the board. It would be quite
a hack (but certainly possible!) to enable an other set of ROMs
to run e.g. the clock software. But then there is also the
difficulty to get the proper (blank) ROMs.
But it is a fun idea to keep in mind ...
The RAM timing traces will be up on Monday!
- Henk, PA8PDP.
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