Graf Elektronik FLO3 Handbuch Seite 52

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TYPE I COMMANO FLOW
the Data Register (the desired track location). A verilicatlon
Operation takes place if the V flag is on. Tha h bit ailows the
head to be loaded at the Start of the command. An Interrupt
is generated at the complation of the command. Note:
When uslng multiple drivas, the track reglster must be
updated for tha drlve selected before seeks are Issued.
STEP
Upon recelpt of this command, the FO179X Issues one
stepplng pulse to the disk drive. The stepplng motor
dlrectlon is the same as in the previous step command.
After a delay determined by the f1r0 field, a verlficatlon
takes place if the V (lag is on. If the U (lag is on, the Track
Register Is updated. The h bit allows the head to be loaded
at the atart of the command. An Interrupt is generated at
the comptetion of the command.
STEFMN
Upon receipt of this command, the FD179X issues one
stepplng pulse In the dlrectlon towards track 76. If the U
TYPE I COMMANO FLOW
flag is on, the Track Register Is Incremented by one. After a
delay determined by the 1^ field, a veriflcatlon takes place
if the V (lag Is on. The h bit allows the head to be loaded at
the start of the command. An Interrupt Is generated at the
completion of the command.
STEP-OUT
Upon receipt of this command, the FD179X issues one
stepping pulse In the cBrectlon towards track 0. If the U flag
Is on, the Track Register is decremented by one. After a
delay determined by the r1 »D field, a verification takes place
if the V flag is oa The h bit allows the head to be loaded at
the start of the command. An Interrupt is generated at the
completion of the command.
EXCEPTIONS
On the 1795/7 devlces, the SSO Output is not affected
durfng Type 1 commands, and an Internat sida compare
does not take place when the(V) Vertfy Flag is on.
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