Re: LAB #2 - PART 1: Address Space

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Posted by John Chappel on February 13, 1998 at 11:22:42:

In Reply to: LAB #2 - PART 1: Address Space posted by Jayesh on February 12, 1998 at 13:56:10:

: On the lab sheets we are told:
: "The UofT68000 board's address space from $200000 to
: $B00000 is not used. ... To reduce the amount of
: wiring, you're allowed to use aliasing. That is,
: instead of locating your register at a specific
: location, you can allow any address in the range
: $200000 to $B00000 to access your register."

: My question is simply whether or not $B00000 is
: included in the allowable addresses. I would think
: that it isn't because it can't be differentiated from
: $BXXXXX without looking at the lower order bits.
: So the allowable addresses are actually $200000 to
: $AFFFFF inclusive, right?

I don't have the 68000 manual with me right now, so I can't
check if $BXXXXX addresses can be used or not. You are certainly
safe using the range $200000 to $AFFFFF.

JC


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