help - 11/34 console problem -- CNTRL key behaviour

[Allison]

>
>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. ;)

>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