Sharp mz-3500 Manual For Use page 220

Section A:
System interface
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44 - Set Multisector Count
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On entry:
c
2CH
E Number of blocks
On return: A Previous Multisector Count
Possible logical errors:
- none -
Possible physical errors:
- none -
Differences to CP/M plus:
The old multisector count is returned,
Differences to CP/M 2.2 resp. DiCOS:
New function.
Follwing functions are affected by the multisector count:
20 read sequential
21 write sequential
33 read random
34 write random
40 write random with zero fill
Normally, one 128-byte block is transferred by above functions. The
number of blocks read/written per system call, however, can be set to
any value from 1 tO 256 (where a value of zero stands for the transfer
of 256 blocks). Hence, up to 32 Kbytes of data can be processed by a
single disk I/0 operation.
If a locical error occurs, its number is returned in register A, in
which case H holds the number of successfully transferred blocks. This
number is in the range 0 to 255.
Physical errors are treated according to the current error handling
mode. The error code is returned in register H.
EOS System manual Daeumling & Zimmermann
Page 83