help - 11/34 console problem -- CNTRL key behaviour - test-drb@ccmp.vtda.org

10 Nov 2005

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Subject: RE: help - 11/34 console problem -- CNTRL key behaviour
   From: "Gooijen, Henk" <henk.gooijen at oce.com>
   Date: Thu, 10 Nov 2005 13:25:03 +0100
     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>

Allison wrote: 

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 ... 
Well it does not have to be a clock.  It happend the product
I was working on was a time code display for video tape where
the display could be time or number of frames.

Besides the display system for PDP-11 is likely OCTAL. ;)

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 The RAM timing traces will be up on Monday! 
Actually a common 2716 or later device is fine for that.  Disable
the on board and use an adaptor. A fast 8008 was 10us instrcution
time so rom speed will not be an issue.  If I were doing it now 
I'd make an adaptor and use a 2816 (EEPROM) with a simple bit of
logic to load stuff.  Not a lot of space is needed  Small loops 
to write to ram and display it are maybe 20-50 bytes. 

Allison