stc7@cunixb.cc.columbia.edu (Steven T Chiang) (02/08/91)
I was looking at a piece of code the other day, and I ran across a jsr to an unfamilar rom routine. I checked a couple of references that I have (Firmware, and Inside the //gs), and couldn't find any information on it. The routine was $f8fa. If anyone has any information on it, it would be greatly appreciated. When I jsr it, it will toggle the 3.5" drive, if there is a disk in it. Thanks _______________________________________________ _______________ | Steve Chiang Apple //gs forever | Coming Soon: | |-----------------------------------------------|---------------| | Internet : stc7@cunixb.cc.columbia.edu | DreamGrafix | | America_Online : DWS Steve | 3200 power | |_______________________________________________|_______________|
sb@pnet91.cts.com (Stephen Brown) (02/09/91)
stc7@cunixb.cc.columbia.edu (Steven T Chiang) writes: > > I was looking at a piece of code the other day, and I ran >across a jsr to an unfamilar rom routine. I checked a couple of >references that I have (Firmware, and Inside the //gs), and couldn't >find any information on it. > > The routine was $f8fa. If anyone has any information on it, >it would be greatly appreciated. When I jsr it, it will toggle the >3.5" drive, if there is a disk in it. > I checked my WHAT'S WHERE IN THE APPLE (for the II+), and my Monitor Rom Listings in the Apple IIe Technical Reference (for the Enh. IIe) and F8FA is not a valid entry point. I've got the IIe ref manual here: F8F9: 06 2D PRMN2 ASL RMNEM ; SHIFT 5 BITS OF CHARACTER INTO A F8FB: 26 2C ROL LMNEM F8FD: 2A ROL A ; (CLEARS CARRY) F8FE: 88 DEY F8FF: D0 F8 BNE PRMN2 As you see, this code is not stable. I would suggest that you not use it. UUCP: lsuc!graham!pnet91!sb INET: sb@pnet91.cts.com