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50 lines
1.7 KiB
Plaintext
50 lines
1.7 KiB
Plaintext
CP/M V2.2, Patch 09, DEBLOCK.ASM, 2/11/82
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Copyright 1982 by Digital Research, Inc., Pacific Grove, CA 93950
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Program: DEBLOCK.ASM
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Error Description:
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The following modification affects only CP/M systems that use
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the optional blocking and deblocking algorithms listed in Appendix G
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of the CP/M Alteration Guide. The sector blocking and deblocking
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algorithms provided in the guide work improperly in certain
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circumstances.
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Patch Procedure:
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Use the CP/M text editor to insert the following changes:
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Following the comment on line 111 of Appendix G:
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"read the selected CP/M sector"
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Insert the following two lines:
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xra a ;accum = 0
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sta unacnt ;unacnt = 0
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The next source lines remain as shown:
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mvi a,1
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sta readop ;read operation
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Insert the following code in your BIOS Home routine:
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home:
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lda hstwrt ;check for pending write
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ora a
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jnz homed
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sta hstact ;clear host active flag
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homed:
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Continue with the rest of the home routine.
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Licensed users are granted the right to include these changes in
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CP/M software. CP/M is a registered trademark of Digital Research.
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