Apple Logic Board Información técnica descargar pdf (Pagina 37)

B. ERROR SUMMARY

1 = illegal function

2 = variable not found

3 = memory block already in use

4 = memory block not found

5 = illegal block selection parameter

6 = memory block is not RAM

7 = segment name already in use

8 = segment not found

9 = illegal segment name

10 = no program is specified (ending line number precedes

starting line number)

11 = no array specified

12 = not enough room in extended RAM to store data

13 = not enough room in normal (low) RAM to recall program

14 = not enough room in normal (low) RAM to load string

V. CURRENT LIMITATIONS

A. The Fetch and Run function (#2) always uses the same BASIC as

the calling program used.

B. Overlays must not be larger than the original space, i.e. the

space where these overlays will be loaded in the program.

As a result, some care must be exercised when overlaying;

RAMEXPAND does not currently change “end of program” pointers

or move variable tables.

C. The Store array (#5, #15) and Fetch array (#5, #16) functions

pass one array at a time, and use the whole array.

1. For the Fetch function, if the saved segment is

smaller than the target array, the end of the target

array is unchanged, and the data in the segment will

overlay the existing data in the array only up to the

point where the source data ends.

2. If the the saved segment is larger than the target

array, not all of the segment is retrieved. Only

data up to the end of the target array is transferred.

VI. EXAMPLE PROGRAM

An Applesoft demonstration program has been provided to

illustrate some of the RAMEXPAND functions. This program

consists of the following files.

DEMO DEMO2 APPEND1 APPEND2 APPEND3 DEMOUTPUT

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 76 77

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Apple Logic Board Información técnica Pagina 37