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22 lines
586 B
Plaintext
22 lines
586 B
Plaintext
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UNDOCUMENTED CP/M FUNCTIONS cont.
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From Microsystems, May 1983, p.70
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CP/M issues a dummy call to the BIOS 'HOME' routine prior to a
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directory read.
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Early versions of the 'CP/M 2.2 Alteration Guide' did not include
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the following sentence in the description of the SELDSK function of
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the BIOS:
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The least significant bit of register E is zero if
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this is the first occurrence of the drive select
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since the last cold or warm start.
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This information can provide a clue to the BIOS that it may need to
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log-in a disk that has been changed.
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