jhl@ttrda.UUCP (Jonathon H. Luer) (04/15/85)
[] What are the limitations of the 1541 anti-knock incantation? I tried it once entered in immediate mode right after poweron, and it worked; another time I tried entering it as a program and SAVEing and RUNning it, and then when I tried a LOAD "*",8,1 I got the READY prompt back with the drive light flashing. Does this only work in immediate mode, or what? Jon Luers ihnp4!ttrdc!jhl
dillon@ucbvax.ARPA (Matt Dillon) (04/19/85)
> [] > > What are the limitations of the 1541 anti-knock incantation? > I tried it once entered in immediate mode right after poweron, > and it worked; another time I tried entering it as a program > and SAVEing and RUNning it, and then when I tried a LOAD "*",8,1 > I got the READY prompt back with the drive light flashing. > Does this only work in immediate mode, or what? > > Jon Luers > ihnp4!ttrdc!jhl *** REPLACE THIS LINE WITH YOUR TERMINAL'S ILLNESS *** Here is the magic incantation w/ Bryce's remarks again: -- The way the 'Magic Incantation' works is by modifying a flag in the drive that tells the 1541's "Brain" that it has already banged the head. The normal value for the location is (5). Up that to 128 and the head will 'shake' but never bump. 133 and most of the 'shake' goes away. 156 and you are home free. PLEASE NOTE; all this does is prevent the banging. The bad sectors (3 in the case of Fleet System II) are still there and read as such. For those that missed the incantation here it is again again; OPEN1,8,15:PRINT#1,"M-W"CHR$(106)CHR$(0)CHR$(1)CHR$(156):CLOSE1 -- Oh, by the way, there was only one 'again' in the original (I just couldn't help it). You didn't give much info to work on... should work fine from a program, but remember that you are modifying the drive's memory, no the C64's.. I am confused as to why you loaded it ,8,1 ... Did you accidently puts the 'm-w' in upper case? Matt.