Date   : Tue, 07 Aug 1984 06:22:59-PDT (Tue)
From   : ihnp4!ihuxp!gvw1@Ucb-Vax.arpa
Subject: PCPI Appli-Card(tm) Drivers

The PCPI Appli-Card(tm) is a versatile CP/M(tm) card for
the Apple II (or IIe). Using the OEM software that can be obtained from
PCPI, one can write special purpose "drivers" that down load into the
Apple at boot time.  The card comes with a standard set of drivers for
controlling the console, printer, etc.  Supposely these drivers can be
relocatable or can be loaded into an absolute location at boot time.

Now to my question for those of you who have a PCPI Appli-Card...

I have been able to write a relocatable driver that allows one to call a
subroutine in the apple.  Yes I know that there is a general command for
doing this, but sometimes values have to be placed in the X, Y, and/or A
registers before calling the subroutine (eg., calling some of the
graphics subroutines in the Applesoft ROMs)--and that's what my driver
does.

My question is:  I am trying to make the driver so that it loads in an
absolute address (eg., at $4000 just above Hi-Res page 1).  I cann't get
it to work--my system hangs when I boot it with this driver installed as
an absolute loading driver (It works great as a relocatable driver.).

Can anyone give me a hint???

       Thanks!
       George V. Wilder
       ihnp4!ihuxp!gvw1
       1 (312) 979-1937
-- 


               George V. Wilder

                        ihnp4!ihuxp!gvw1