TITLE
Applesoft: Mixing DOS and High-Res 

Article ID: 50
Created: 9/21/84
Modified: 3/2/98
 

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TOPIC 
DOS uses two memory locations, $26 and $27, which are also used by Applesoft's 
High-Res routines during the HPLOT TO X,Y statement. DOS commands mixed in with 
HPLOT TO X,Y statements prevent the X,Y from plotting properly.



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DISCUSSION 

To enable mixing DOS with High-Res, you must save and restore the pointer. 
Statments 25 and 35, in the second program, demonstrate how to maintain the pointer 
values.

This will not work:

10 D$ = CHR$(4) 
20 HPLOT 1,2
30 PRINT D$;"CATALOG"
40 HPLOT TO 33,44

This does work:

10 D$ = CHR$(4)
20 HPLOT 1,2
25 A = PEEK(38): B = PEEK(39)
30 PRINT D$;"CATALOG"
35 POKE 38,A: POKE 39,B
40 HPLOT TO 33,44