🚀 go-pugleaf

In article <Bx9JGp.464@jabba.ess.harris.com> dwilliam@jabba.ess.harris.com (Dave Williams) writes:
:
:   The EVBU (EVBU stands for EValuation Board, University style, by the
:way) is a much less complex board.  
:Mot. supplies a program for PCs called PCBug11 that operates via the
:bootstrap mode of the 6811.  What happens, is you power everything up,
:and PCBug11 loads a "talker" program into the 6811.  This program is
:used to modify the 6811's internal registers and memory under control
:of the PC.
I am pleased to hear that this arrangement is available.  This sounds like
it implements a way of doing things that I had envisioned, which doesn't
hog the board's resources.

:In article<???> reeder@reed.edu (Doug Reeder) writes:
:>Functionally, the HC11 is always in single-chip operating mode, so
:>hardware not part of the EVB cannot be in the memory map.  This means 
:>you are forever limited to the two 8K blocks of RAM (though you could
:>replace the 8K ROM with one of your own).
:
:   Hummm.  I wouldn't say that - There's quite a few holes in the
:EVB memory map where you could put all sorts of nifty stuff.

How? There are no connectors to the address and data busses on the board.
The B and C ports ara available at connector P1, but only as general I/O
ports, since connector P1 looks like an HC11 in single-chip mode.




-- 
Doug Reeder                              Internet: reeder@reed.EDU
Div, Grad & Curl                         USENET:   ...!tektronix!reed!reeder
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I am actively seeking scientific programming contracts.