jamesh@pro-colony.UUCP (James Howell) (07/15/89)
When I make a call to the SmartPort dispatcher, I make a call
to $C503 + ($C5FF). This means the call can be in the range $C503 to $C602.
Can I ASSUME that this call will always be only to page $C5? If I can, it
will save me approx. 8 bytes of code for my call which is important since I am
making the call via an APW UltraMacro.
- Jimdlyons@Apple.COM (David Lyons) (07/17/89)
In article <8907150556.AA20740@crash.cts.com> pnet01!pro-simasd!pro-colony!jamesh@nosc.mil writes: >When I make a call to the SmartPort dispatcher, I make a call >to $C503 + ($C5FF). This means the call can be in the range $C503 to $C602. >Can I ASSUME that this call will always be only to page $C5? If I can, it >will save me approx. 8 bytes of code for my call which is important since I am >making the call via an APW UltraMacro. > - Jim Yes, you can assume that the SmartPort entry point is in the same memory page as the ProDOS entry point. (My reasoning on this is that the ProDOS entry point has to have at least two bytes of code at it, and $CnFE and $CnFF have special meaning for ProDOS devices.) On the other hand, you shouldn't assume that slot 5 contains a SmartPort device, or that other slots don't contain SmartPort devices. --Dave Lyons, Apple Computer, Inc. | DAL Systems AppleLink--Apple Edition: DAVE.LYONS | P.O. Box 875 AppleLink--Personal Edition: Dave Lyons | Cupertino, CA 95015-0875 GEnie: D.LYONS2 or DAVE.LYONS CompuServe: 72177,3233 Internet/BITNET: dlyons@apple.com UUCP: ...!ames!apple!dlyons My opinions are my own, not Apple's.