NO-SLOT-CLOCK PATCH

Why is this patch needed?

SMT does have a new utility disk that will allow use of the
No-Slot-Clock without modifying PRODOS that will work with all versions
of PRODOS past, present and future - (A new SYSTEM file is installed and
executed automatically on boot).  However, I found that in my situation,
booting from a hard disk with an 8mhz Zip Chip installed, it did not
work unless the Zip was first reset to 1mhz (ug!) - so I have continued
to update the ORIGINAL No-Slot-Clock Install program to avoid this
problem.

How to make the patch to the software originally provided by SMT.

The text file NSC.PATCH should be copied onto a BACKUP of the original
No Slot Clock software disk and executed from BASIC.  Make sure the
prefix is set to /NO.SLOT.CLOCK and type -NSC.PATCH to EXEC the text
file and modify the install program.  This patch will fix the original
NSC INSTALL program to work with PRODOS 2.01 and earlier versions.  It
is a modification of a patch that appeared in the 2/90 A2-Central by
Frank Shirk which was subsequently remodified by me to work with Prodos
1.9 and now is being re-remodified to work with 2.01. (Whew!).

Modifying PRODOS to work with the No-Slot-Clock.

To modify PRODOS. run the STARTUP program from the /NO.SLOT.CLOCK disk
and select the menu item to apply the modification to PRODOS. This loads
the INSTALL program and a binary file containing the NSC clock driver).

For the curious, the modification for PRODOS 2.01 consists of a one byte
change to $2E06, the clock driver at $2F00 is replaced with the NSC
driver and another 4 byte change is required at $2852. The patched
INSTALL program checks various locations in Prodos to determine the
Prodos version and applies the patch accordingly.  If the program does
not recognize the version of PRODOS being modified, or if the
modification has already been made it will abort.


Nigel Broder
April 3, 1992