Re: Y1.999K problem

[dempson@actrix.gen.nz (David Empson)]

ISCA AppleII Librarian <apple2pd@ground.ecn.uiowa.edu> wrote:

> I don't know what ProDOS file is loaded when booting from Appleshare3.0.3

Neither do I, but I suspect you may be right with this statement:

> My concern is the ProDOS image is located in the Mac System Folder in the
> file 'Apple //e Boot Blocks' and ProDOS is not loaded from a standard p8
> system file.

> My back-up plan is to extract the clock driver code from a patched ProDOS
> (I hope the year table is in the driver code, can anyone confirm?).

Yes, it is.  The clock driver is located by following the JMP
instruction in the global page ($BF06).  The exact length is not
specified, but it can be up to 125 bytes long.

You should be able to compare the contents of a pre-patch and post-patch
version of the driver.  I think the patch just updates the 7-byte table
that is used to calculate the year, which is near the end of the driver.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand