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ICHAPTERI
GENERAL INFORMA TION 1
Introduction
The HP 911 4A Disc Memory (Figure 1- 1) is a random access data storage device. The HP 9 1 14A
contains a single 3 1/2 inch double sided disc drive providing 710 Kbytes of storage capacity. The
HP 9114A is battery-powered by a 6 volt lead -acid dry cell.
The HP 9114A Drive supports both the SUBSET/80 and the FILBERT command set to allow the
device to be compatible to existing and future HP-IL devices.
HP 9114A
Figure 1-1. HP 9114A Flexible Disc Memory
Technical Specifications
Listed next are the electrical and physical specifications for the HP 9114A disc memory.
Number of drives 1
Net Weight 2.68kg (5.9 Ibs)
Height 76 mm (3.00 in.)
Depth 200 mm (8.00 in.)
Width 28 7 . 5mm (1 1 . 5 in.)
Printed 6/01/84 Part Number 5957-6557
1-1
GENERAL INFORMATION
Interface HP-IL
HP Double Density Format
Encoding: MFM
Rotational Speed: 600 RPM
Bit Density @ 600 RPM: Track 79 (Inside track)
8717 BPI
Track Density: 135 tracks per inch
Tracks per Surface: 80
Surfaces used per disc: 2
Capacity HP 110 Series 40 and 70
Bytes/Sector: 512 Max storage capacity will vary
Sectors/Track: 9 depending on the REV firmware
Bytes/Drive (Formatted): 710 Kbytes used in the 40 and 70 series
products. Typical would be 128K
bytes.
NOTE
The HP 9114A spares 4 complete tracks. This reduces the
usable user space to 512*09*78*2 (bytes/sector times sec-
tor/traGk times unspared tracks times number of sides.) This
total equals 718.848 Kbytes. Additionally, directories further
reduce usable user space. This, as implemented by HP, gener-
ally takes track O. Actual usable space will be 718.848 Kbytes
minus track 0 for a total of 709.632 Kbytes.
Access Time
Track-to-Track Seek: 15 ms/track
plus 42 ms settling
Maximum Track-to-Track
Seek (80 tracks): 1242 ms
Average Track-to-Track: 447 ms
Maximum Rotational Latency: 100 ms
Average Rotational Latency: 50 ms
Spindle Motor on time: 400 ms
Maximum Data Access Time
(Seek plus Latency
plus Motor on time): 1742 ms
Average Data Access Time: 497 ms
Maximum Sustained Transfer
rate: 6 Kbytes/second
Maximum sustained transfer rate of the 9114 will be dependent on the number of devices contained within
the HP-IL loop. As more devices are added, the apparent data transfer rate decreases.
1-2
GENERAL INFORMATION
Power Requirements
The HP 9ll4A is powered by a 6 volt lead-acid dry cell. The charging time of the battery to 80% of
capacity is approximately five hours. The standby life (no access to the disc) is greater than three days. The
following table shows the estimated battery life at various duty cycles.
BATTERY LIFE
TIME BETWEEN
DISC ACCESSES WITHOUT CHARGER WITH CHARGER
o SECONDS 40 MIN 60 MIN
10 SECONDS 75 MIN 2 HRS
30 SECONDS 2 HRS 3 HRS
60 SECONDS 4 HRS 20 HRS
90 SECONDS 6 HRS CONTINUOUS
AC Adapter/Recharger
The adapter/recharger can be connected to the disc drive at any time. If you connect the recharger during
read/write operations (disc access light is on), avoid jarring the drive.
You can use the disc drive while the battery pack is charging. In fact, it is recommended that you use the
adapter/recharger whenever possible, even when the battery is fully charged.
The sealed lead-acid battery operates best on shallow, less than 30% discharge cycles, or constant "trickle"
charge with the recharger usually connected.
Normal battery life is 3 to 5 years. Replacement batteries are available; order HP 880 l4A Rechargeable
Battery Pack.
To preserve the maximum capacity of the battery pack, charge it fully and operate as much as possible with
the recharger connected.
WARNING
Do not short the battery. This will blow a fuse internal to the
battery pack and make the pack inoperative.
Do not incinerate. The battery can burst if thrown into a fire.
Do not put within reach of children.
Do not disassemble the battery. The strong acid electrolyte
sealed inside can burn your skin and clothes.
If the battery is accidently broken and the electrolyte (gelled
sulfuric acid) leaks out, neutralize the acid with some a vail-
able alkaline substance, such as ammonium solution or baking
powder (sodium hydrogen carbonate) and wipe up the spill
wi th a cloth.
1-3
GENERAL INFORMATION
In the event electrolyte contacts the skin, immediately flush
with water and consult a doctor.
I CAUTION I
This battery pack is designed specifically to work with an HP
recharger; Therefore HP is not responsible for damages caused
by using a non HP recharger.
The adapter/rechargers listed next are recommended for use with the HP 880 14A Rechargeable Battery
Pack.
Model AC Voltage Identification
HP 820598 90 to 120 United States
HP 820668 210 to 250 Europe
HP 820678 210 to 250 United Kingdom
HP 820678 Opt 001 210 to 250 Republic of South Africa
HP 820688 210 to 250 Australia
HP 820698 90 to 120 Europe
Environmental Specs
Operating Limits 10 0 C to 40 0 C(50