53 lines
1.8 KiB
Plaintext
53 lines
1.8 KiB
Plaintext
.bp
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.nf
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.na
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DOS ZERO PAGE USAGE
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.sp1
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.un
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BYTE USE
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24 Cursor horizontal (DOS)
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26,27 Sector read buffer address (ROM)
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Scratch space (RWTS)
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28,29 BASL/BASH (DOS)
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2A Segment merge counter (ROM,BOOT)
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Scratch space (RWTS)
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2B BOOT slot*16 (ROM)
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Scratch space (RWTS)
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2C Checksum from sector header (RWTS)
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2D Sector number from sector header (RWTS)
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2E Track number from sector header (RWTS)
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2F Volume number from sector header (RWTS)
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33 Prompt character (DOS)
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35 Drive number in high bit (RWTS)
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36,37 CSWL,CSWH (DOS)
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38,39 KSWL,KSWH (DOS)
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3C Workbyte (ROM)
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Merge workbyte (BOOT)
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Device characteristics table address (RWTS)
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3D Sector number (ROM)
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Device characteristics table address (RWTS)
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3E,3F Address of ROM sector-read subroutine (BOOT)
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Buffer address (RWTS)
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40,41 DOS image address (BOOT)
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File buffer address (DOS)
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41 Format track counter (RWTS)
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42,43 Buffer address (DOS)
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44,45 Numeric operand (DOS)
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46,47 Scratch space (RWTS)
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48,49 IOB address (RWTS)
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4A,4B INTEGER BASIC LOMEM address (DOS)
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Format diskette workspace (RWTS)
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4C,4D INTEGER BASIC HIMEM address (DOS)
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67,68 APPLESOFT BASIC PROGRAM START (DOS)
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69,6A APPLESOFT BASIC VARIABLES START (DOS)
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6F,70 APPLESOFT BASIC STRING START (DOS)
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73,74 APPLESOFT BASIC HIMEM address (DOS)
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76 APPLESOFT BASIC line number high (DOS)
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AF,B0 APPLESOFT BASIC PROGRAM END (DOS)
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CA,CB INTEGER BASIC PROGRAM START (DOS)
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CC,CD INTEGER BASIC VARIABLES END (DOS)
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D6 APPLESOFT BASIC PROGRAM protection flag (DOS)
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D8,D9 INTEGER BASIC line number (DOS)
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APPLESOFT BASIC ONERR (DOS)
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.br
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