|Micropolis 1924-21 Specifications|
|Formatted Capacity||2100 MB|
|Average Seek||11.5 msec|
|Single Track||2.0 msec|
|Rotation Speed / Avg. Latency||5400 rpm +/- 0.5%|
|Transfer Rate to / from media||10 Mbytes / sec Synchronous|
|Transfer Rate to / from buffer||N/A|
|Tracks Per Inch (TPI)|
|Bits Per Inch (BPI)|
|Dimensions||8.0"L x 5.75"W x 3. 25"H|
|+12V +/-5%||+5V +/-5%||Power|
|Read / Write||4.35A||.9A|
|Drive Addressing and Interface Termination
ID0, ID1, ID2 SCSI Address Jumpers
The SCSI ID (drive address) jumpers are identified as ID0, ID1, and ID2.
ID selection is binary, as shown in the table below.
For multiple drive installations, on one Host Adapter, each drive must
have a unique address. Drives are configured as SCSI ID 7 at the factory.
RN6 Interface Terminator
The Interface Terminator factory installed at RN6 provides proper termination
for the interface lines. When daisy-chaining multiple drives, leave the terminator
installed only in the last physical drive (or drives) on the daisy chain cable; remove
the terminator from each of the other drives (or the host computer).
Bus Termination Power Option
A jumper is installed at W1, at W2, or at W2 and W12 to select the source of terminator
power (+5V) for the SCSI Bus terminator packs on the device electronics board.
DO NOT INSTALL JUMPERS AT BOTH W1 AND W12
When a jumper is installed at W1 (the factory default configuration), the drive
provides terminator power to it's on-board terminators.
When a jumper is installed at W2 , terminator power is is provided by the host
system via the interface cable J1, pin 26 (TERMPWR).
When a jumper is install at both W2 and W12, the drive provides terminator
power to its on-board terminators and also to the SCSI bus via interface cable
J1, pin 26(TERMPWR).
Frame Ground Options
Jumper W11 selects the frame ground option.
When W11 is installed, the drive's frame is connected to frame ground.
When a jumper is not installed at W11 (the factory default configuration), frame
ground is not connected to logic ground.
Spindle Control Options
A jumper bridging pins 7 and 8 of J2 (the 4th set of pins) is used to select the
spindle control option.
When a jumper is installed, the drive must wait for an interface Start Unit command
to start the spindle motor.
When a jumper is not installed (the factory default configuration), the drive
automatically starts the spindle motor at power-on.
Write Protect Option
A jumper bridging pins 11 and 12 of J2 (the 6th set of pins) is used to select the
write protect option.
When a jumper is installed, the drive is write protected. CAUTION: The drive can
still be formatted.
When a jumper is not installed, (the factory default configuration), the drive is not
Bus Parity Option
A jumper bridging pins 13 and 14 of J2(7th set of pins) is used to select the parity
When a jumper is not installed, (the factory default configuration), the drive generates
but does not detect parity.
When a jumper is installed, the drive generates parity and enables parity detection.
Spindle Synchronization Option
The Rotational Position Locking field (MODE SELECT command, Page Code 04h)
is used to specify spindle synchronization operation; see document #110366
(Scsi Implementation in Micropolis "MZR" Products) and ANSI SCSI Standard.
Unsynchronized: If the drive is set to Unsynchronized (PRL=00b), it ignores the
SLAVE SYNC signal.
Slave: If the drive is set to Slave (RPL=01b), it does not generate the MASTER SYNC
signal or the SLAVE SYNC signal but synchronizes its index to the SLAVE SYNC
signal (J2,pin 20) supplied by an external source.
Master: If the drive is set to MASTER (RPL=10b), it generates the SLAVE SYNC
output signal (j2,pin 20) for use directly by the slave drives.
Master Control: If the drive is set to Master Control (RPL=11b), it generates
the MASTER SYNC signal (j2, pin 20). This output is used by the controller to
generate the SLAVE SYNC signal (J2, pin 20) for the slave drives.
**** THESE SPECIFICATIONS ARE PRELIMINARY.
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