Sharp mz-3500 Manual For Use page 210

Section A: System interface
According to the current Multisector Count, 128 up to 32768 bytes can be
transferred by a single write operation, The specified block number is
not affected,
It is possible to write a specific block in random mode,
sequential writing for further processing. However, the
write the current block on the first sequential access,
blocks if the Multisector Count is greater than 1.
then switch to
system will re-
resp. the first
In case of logical errors, register A holds an error number and H the
number of successfully read blocks.
Physical
mode. In
code.
errors are treated according to the specified error handling
case of return, A is set to 0FFH and H holds the physical error
EOS system manual
Daeumling & Zimmermann
Page 73