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2000-06-30
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CP/M V2.2, Patch 09, DEBLOCK.ASM, 2/11/82
Copyright 1982 by Digital Research, Inc., Pacific Grove, CA 93950
Program: DEBLOCK.ASM
Error Description:
The following modification affects only CP/M systems that use
the optional blocking and deblocking algorithms listed in Appendix G
of the CP/M Alteration Guide. The sector blocking and deblocking
algorithms provided in the guide work improperly in certain
circumstances.
Patch Procedure:
Use the CP/M text editor to insert the following changes:
Following the comment on line 111 of Appendix G:
"read the selected CP/M sector"
Insert the following two lines:
xra a ;accum = 0
sta unacnt ;unacnt = 0
The next source lines remain as shown:
mvi a,1
sta readop ;read operation
Insert the following code in your BIOS Home routine:
home:
lda hstwrt ;check for pending write
ora a
jnz homed
sta hstact ;clear host active flag
homed:
Continue with the rest of the home routine.
Licensed users are granted the right to include these changes in