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A-16 HP 9895A Disc Memory Command Set
ATN
(IOADDRS
I
Primary
*
Receive Status
ATN
P
I
PIIOIOOO
Secondary
I
~
I
OODSSSSS
I
I
Stat 1
EOI
ATN
P
TTTTRI
,AW EFCSS,
P
I
PIOll1llI
E
Stat 2
Untalk
Where:
Bit
51
Binary (Decimal)
00000 (0)
00001 (1)
00111 (7)
01000 (8)
Number
Description
Stat 1
(From previous operation)
D
13
D Bit
SSSSS
12-8
Sl (see following table)
UNIT
3-0
Unit Number
Stat 2
(From current operation)
*
15
Set if one or more starred bits
are set.
TTTT
12-9
Disc Type
R
8
Reserved
A
7
Drive Attention
W
6
Disc is Write Protected
E
4
*Drive Fault
F
3
First Status Bit
C
2
*Seek Check
SS
1,0
*Drive Ready Status
Meaning
Normal completion. The operations completed without er-
ror, or the controller has just been cleared or powered up.
Illegal opcode. The last command contained an opcode
which is not recognized by the 9895A.
Cylinder compare error. The target cylinder has one or
more sectors in which the track number does not corres-
pond with the track number of the remainder of the sec-
tors. The controller will automatically re-try the read/write
operation once if this is encountered.
Uncorrectable data error. The disc read or verify operation
was terminated because a CRC error was detected in the
data field. The data is still transmitted for the bad sector.
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