Hard Drive: EPSON: HD-850 10MB 5.25"/FH MFM ST506
H D - 8 5 0 EPSON
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 5.25"/FH Cylinders 306| | |
Capacity form/unform 10/ 13 MB Heads 4| | |
Seek time / track 55.0/18.0 ms Sector/track 32| | |
Controller MFM / ST506 Precompensation
Cache/Buffer KB Landing Zone 305
Data transfer rate 0.625 MB/S int Bytes/Sector 256
0.625 MB/S ext
Recording method MFM operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 50 | -40 65
Power: sleep W Humidity % 8 80 | 8 85
standby 16.0 W Altitude km 3.000| 10.000
idle W Shock g 5 | 40
seek W Rotation RPM 3600
read/write W Acoustic dBA 50
spin-up W ECC Bit
MTBF h 20000
Warranty Month
Lift/Lock/Park NO Certificates
Layout
EPSON HD-800 SERIES PRODUCT MANUAL MK1800-E3 07-85
+-----------------------------------------------------------+ | Shunt Block :::::| | +-------+ | | +--+Dip Terminator+-------++-+ | | |Switch |XX | +--+ |XX J2 | |XX | |XX | | | |XX | |XX J1 | |XX | |XX | |XX | |XX | | | J4+-+XX J3 | +-+XX Power +---------------------------------------------------------+
Jumpers
EPSON HD-800 SERIES PRODUCT MANUAL MK1800-E3 07-85
Jumper Setting
==============
Dip Switch Definitions
----------------------
Optional functions are selected by the DIP switch located behind the
front bezel.
+---------+
ON | . x x x |
OFF| x . . . |
-----+-1-2-3-4-+---PCB----
Dip Switch Function
No.
1 Always set OFF
2 When set ON, error display activated
3 When set ON, delayed start activated
4 (If higher than max cylinder seeked)
When set OFF, stop at the max cylinder
When set ON, return to cylinder zero
Drive Selection
---------------
Pin Pair Function when SHORTED
1 Drive Select Number 1
2 Drive Select Number 2
3 Drive Select Number 3
4 Drive Select Number 4
5 Radial Operation
Each drive has its own drive select number 1 through 4 by shorting
the appropriate pin pair of the shunt block. Drive selection occurs
when one the -DRIVE SELECT lines is activated. Only the selected
drive responds to the input signals, and only that drive's output
signals are then gated to the controller interface.
Short the appropriate pin pair of the shunt block that consists of 5
pin pairs determines which select line on the interface will activate
the drive. As shipped, the drive select number 1 is selected.
Radial Operation
----------------
The radial operation is selected by shorting the 5th pin pair of the
shunt block. In the radial operation, both the drive select number
pin pair 1 through 4 and 5th pin pair must be selected and all drives
should have the resistor pack installed. As shipped, the drive is set
in the radial operation and all input and output lines are active,
even if the drive is not selected through the -DRIVE SELECT signals.
However, -DRIVE SELECT must be active light the LED. The 5th short
pin must be removed if the drive is to be operated in the daisy chain
operation.
J3 DC Power and pin connector assignments
-------------------------------------------
+--------------+
|+-----J3-----+| pin 1 +12 VDC
|| 4 3 2 1 || pin 2 +12 Volts Return
|+------------+| pin 3 + 5 Volts Return
+--------------+ pin 4 + 5 VDC
Install
EPSON HD-800 SERIES PRODUCT MANUAL MK1800-E3 07-85
Notes on installation
=====================
Drive mounting
--------------
horizontally vertically
+-----------------+ +--+ +--+ +------------------+
| | | +-----+ +-----+ | | | x
| | | | | | | | x+----------------+x
+-+-----------------+-+ | | | | | | ||x x||
+---------------------+ | | | | | | || x x ||
| | | | | | || x x ||
x x | | | | | | || x x ||
+------x------x-------+ | +-----+ +-----+ | || xx ||
+-+------x--x-------+-+ +--+ +--+ || x x ||
| xx | || x x ||
| x x | || x x ||
+---x--------x----+ |x x|
x x x++----------------++x
UNACCEPTABLE! UNACCEPTABLE!
Recommended orientation is vertical on either long side (so that the
carriage moves horizontally) or horizontal with the PCB down. The
prohibited orientation is horizontal with the PCB up or vertical with
front bezel up or down.
Cable Interconnection - 4 Drive System
--------------------------------------
HOST
+-----------+ +-----------------+
| +---o---Control------------------+J1 Drive 1 |
| | | +-------Data------------+J2 |
| | | | +-Power---+J3 J4 ... |
| | | | | +-----+-----------+
| | | | | +-Frame----+
| | | | | | +-----------------+
|Controller | o----+-------------+----+----+J1 Drive 2 |
| | | | +-----------+----+----+J2 |
| | | | | o----+----+J3 J4 ... |
| | | | | | | +----+------------+
| | | | | | o---------+
| | | | | | | +-----------------+
+-----------+ o----+-+-----------+----+----+J1 Drive 3 |
| | | | | +---------+----+----+J2 |
| +---+----+ | | o----+----+J3 J4 ... |
| +---+------+ | | | +-----+-----------+
| | | | | o----------+
|Data +---+--------+ | | +-----------------+
|Separator | +------------------+----+----+J1 Drive 4 |
| +----------------------+----+----+J2 |
| | o----+----+J3 J4 XXX |
+-----------+ | | +-----+-----------+
DC voltages----+ o----------+
|
Frame Ground--------+
... = Terminator Pack removed
XXX = Terminator Pack installed
Features
EPSON HD-800 SERIES PRODUCT MANUAL MK-1800-E3 07-85
Seek Time
---------
+----------------------------------+--------+--------+--------+
| | HD-830 | HD-850 | HD-860 |
+----------------------------------+--------+--------+--------+
|Track-to-Track msec. typ. | 18 | 18 | 18 |
+----------------------------------+--------+--------+--------+
|Average msec. typ. | 85 | 55 | 85 |
| msec. max. | 215 | 170 | 215 |
+----------------------------------+--------+--------+--------+
|Settling Time msec. | 15 | 15 | 15 |
+----------------------------------+--------+--------+--------+
|Latency msec. avg. | 8.33 | 8.33 | 8.33 |
+----------------------------------+--------+--------+--------+
Media Defect Criteria (as shipped from EPSON)
---------------------------------------------
Maximum Defects per Surface 8
Maximum Defects per Drive 10 (HD-830,850)
20 (HD-860)
Cylinder Zero certified Defect Free.
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