<H2>The GETLN Buffer and a ProDOS Clock Card </H2><PRE>Apple II
Technical Notes
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                                                  Developer Technical =
Support

Pascal
#17:    SYSTEM.APPLE Patch V2.0

Revised by:    Dan Strnad                                          March =
1990
Written by:    Dan Strnad                                            May =
1988

This Technical Note documents the Apple Pascal SYSTEM.APPLE patch =
version 2.0=20
(available as part of the Apple Pascal 1.3 package from APDA), which =
fixes two=20
Pascal system bugs found in the 64K and 128K, regular and run-time, =
version=20
1.2 and 1.3 Pascal systems.  A companion program confirms the correct=20
installation of these patches.
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____

SYSTEM.APPLE patch 2.0 corrects the following two bugs:

  1.  UNITSTATUS calls to device numbers six, seven, and eight=20
      malfunction in Apple II Pascal 1.3.
  2.  On Apple IIGS machines, disk access to 5.25" drives may fail under =

      Apple II Pascal.

The following limitations exist with these patches:

  1.  Keyboard input from an external terminal does not work; however,=20
      SYSTEM.APPLE patch 1.0 is also available to support external=20
      terminals.  SYSTEM.APPLE patch 1.0 fixes only the UNITSTATUS=20
      problem; it does not address the 5.25" drive problem on the Apple =
IIGS.

  2.  Type-ahead buffering may drop keystrokes under the following=20
      circumstances:
        a.  On an Apple IIGS if the user has enabled keyboard=20
            buffering from the Control Panel.
        b.  On an Apple IIc series computer, if an Apple II Pascal=20
            program directly accesses the firmware-level keyboard=20
            buffering.

Apple II Pascal 1.3 (and 1.2) still provide type-ahead keystroke =
buffering on=20
all Apple IIs.

To use the patch program, X)ecute it from Pascal with the name PATCH.  =
To=20
confirm the proper installation of the patch, perform an X)ecute with =
the name=20
CONFIRM.

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