DMn2004404 wrote:
On Feb 5, 12:25 pm, "Michael J. Mahon" <mjma...@aol.com> wrote:DMn2004404 wrote:And, if my program should include storing values in memory locations (such as losses in location 768, ties in location 769, and wins in location 770), what will happen to those values when the program encounters the FLUSH command?Nothing whatsoever. Page 3 is safe from just about everything.Michael J. Mahon wrote:Michael J. Mahon wrote:DMn2004404 wrote:Here's the scenario: I have written an Applesoft BASIC program that uses a No-Slot Clock in my Enhanced Apple //e. I have RUN the program and had it execute a routine that displays the system date and time. When the program reaches this routine at, let's say, 6:32 PM, it says the time is 6:32 PM. So far, it appears the date and time routine is working properly. But, let's say I've had this same program running continuously for, say, two minutes, and the time is now 6:34 PM, but when I send the computer back to the date and time routine, the program says the time is still 6:32 PM. What's the deal here, and is there any way to rectify it?You didn't mention how your Applesoft program was getting the time, but I'm guessing that it's PEEKing it from the locations in the ProDOS global page.ProDOS only updates this location when a ProDOS file operation is executed. If you do a PRINT CHR$(4)"verify" command, ProDos will update the global page time and date.Sorry, I misremembered--the proper command to update the date/time on the global page without messing anything else up is FLUSH.So just insert:1234 PRINT CHR$(4)"FLUSH"(with the appropriate line number, of course) before you read the global page bytes and they will be up-to-date. No machine language needed.-michael NadaNet 3.1 for Apple II parallel computing! Home page: http://home.comcast.net/~mjmahon/ "The wastebasket is our most important design tool--and it's seriously underused."Everything except an "OpenApple-Control-Reset," right?
Even then, all of the "user" part of page 3 is safe: $300..$3CF are untouched. $3D0..$3FF are used by the system. -michael NadaNet 3.1 for Apple II parallel computing! Home page: http://home.comcast.net/~mjmahon/ "The wastebasket is our most important design tool--and it's seriously underused."