Re: A86: batt checker


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Re: A86: batt checker




in reg,(c) isn't undocumented.  the undocumented one is in (c) or in
f,(c) which only affects the flags.  the downside to these is that you
have to load c with the port number first and they take one more t-state.

from z80iss.txt:                   CZPSNH
+------------+--------------------+------+---+---+
|IN A,(n)    |A:=port(n)          |......| 2 |11 |
|IN r,(C)    |r:=port(C)          |.*P*0*| 2 |12 |
|IN ?,(C)    |only set flags as   |.*P*0*| 2 |12 |
|            |   as IN r,(C) does |      |   |   |
+------------+--------------------+------+---+---+

zilog probly didn't tell people about them because they didn't intend
them to be there in the first place.

-josh


On Wed, 2 Dec 1998 15:00:35 EST ComAsYuAre@aol.com writes:
>
>are you saying that you can do in and out with all registers? that's 
>really
>useful.  don't see why zilog kept everyone in the dark about this 
>stuff.
>

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