woody@tybalt.caltech.edu (William Edward Woody) (03/02/88)
While tromping through the Macintosh II roms with my steel tipped boots on, I noticed that when you do a _Status call (PBStatus() for all you Pascal and C fans) to an open driver with csCode set to 1 in the ParamBlockRec, then in the first 4 bytes of csParam you get back the DCtlEntry record for that driver. It seems that the ROMS are intercepting the _Status call and looks up the DCtlEntry record for the open driver if csCode is 1; the ROMS never call the device driver itself. My question is this: Is this documented anywhere? I see no mention in Inside Macintosh anywhere about this "undocumented feature." And are there any other caviats of which are the ROMS which I should be aware about in this vain? - William Edward Woody woody@tybalt.caltech.edu (Mac>][n&&/|\)&&(MacII>AT) Disclamer: I haven't the foggiest idea what I'm talking about...