Texas Instruments PHP 1250 Handbuch Seite 4

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TEXAS INSTRUMENTS
INTRODUCTlON
The Texas lnstruments Disk Memory Drive is a high-speed, highvolu-
me memory device. The disk drive reads information !rom and writes
information o n a 5-1/4 inch diskette (noi included).ll can read orwrile
inlormation l rom any piace o n the diskette, and can rapidly locate any
position or file o n lhe diskette. The disk drive spins the diskette al a
constant speed and controls the movement ol the magnetized head.
T o lunction properly, a disk drive musi h ave a disk controllar. The Disk
Drive Controller tells the disk drive where to position the magnetic
h e ad in order lo read or write inlormation properly. The controller al so
puts
a
catalog on the disk, making the data that has been written easy
t o locate. The controller does these things in response t o commands
which you choose with the Disk Manager, n LOGO, Editor/ Assembler,
and other Sol id State Cardridge Com m an d Modules or in response lo
the statements in a n BASIC program.
This manual conlains only the set-up, and service, information !or the
Disk Memory Drive. For instructions regarding setup, test, and opera-
tion or the complete disk system, please refer lo the Disk Memory
System manual includcd with the Disk Drive Controller.
Two possible configurations exisl in lhe type of disk drives you can
set-up. First, you can h ave an internai disk drive that is specially tailo-
red to fil i~side the Peripheral Expansion System and up lo two exter-
nal drives. Second, you can have up lo three external drives connec-
ted lo the system.
DISK DRIVE INFORMA nON
As it comes !rom the factory, a disk drive is ready to run as the only
drive on your system. Il you are using more t han onc drive, complete
the following steps !or ali but o ne o! the drive s. The las t external drive
should be connected withoul being altered.
DO THE FOLLOWING ONL Y IF YOU
ARE USING TWO OR THREE DRIVES!
1. WARNING: All POWER CORDS MUST BE DISCONNECTED
FROM THE POWER OUTLETS DURING THE FOLLOWING PRO-
CEDURE!
2. T o remove the cover, do one of the following.
e
Internai Disk Drive- On the side otthe disk drive is a tab !oca-
led near the back of the drive. O n the back of the drive is a hole
designed lo help Iii! l h e lab lo remove the disk drive cover. Re-
move the cover by lifting lhc tab and lhen sliding out the drive's
conlents.
e
Exlernal Disk Drive- O n ali bui o ne of your drive s. usc a Phil-
lips-head screwdriver lo remove the six screws lhat hold lhe
cover. Lift lhe cover oH.
3. Locate the main printed circuii board. O n il, locate the terminalion
resister pack. lt has 14 leads an d looks like an inlegrated circuii.
(Note: The main boards look slighlly different on the internai and
external drives, but the pack is in the same piace o n each.) Be ca-
retul not lo disturb the strapping pack (or shunl pack, which is al so
removabte) located very near the resislor pack.
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4. Remove the termination resistor pack by prying each end up
slighlly with a small screwdriver and then lifting it out. Pull straighl
up.
5. Save the single drive termination resistor pack so that you can
reinsert il il the drive is ever to be used again as a single of las t disk
drive. Il you do replace the pack, noi t hai il the socket forthe resis-
tor pack has more ho l es t han !h ere are pins o n the pack, the pack
should be installcd toward the outer edge ol the circuii board,
leaving the unused holes toward the center of the board.
6. Replace the cover o n the drive, aligning and tightening the screws
carefully DO NOT OPERATE ANY UNIT WlTHOUT REPI...ACING
THE COVER.
The procedure !or setting up the Disk Memory System depends o n the
type or disk drive(s) you have.
e
Il you have an internai drive only, see "Connecting the Controller
Card t o an Internai Disk Drive.·
e
Il you are using an internai disk drive with one or more external disk
drives, follow the directions in "Connecting the Controller Card t o
Bot h Internai and Extemal Disk Drive s.·
e
Il you h ave o ne or more external drives and no internai drive, follow
the directions in "Connecting the Controller Card lo External Disk
Drives.·
CONNECnNG THE CONTROLLER CARD AND AN INTERNAL DISK
DRIVE
1. Tu m oH the computer console and ali attached devices.
2. WARNING: TO AVOlO DAMAGING ACCESSORY CARDS, WAIT
TWO (2) MINlJTES AFTER TURNING OFF THE UNIT FOR THE
POWER TO DISCHARGE BEFORE PROCEEDING.
3. Remove the top !rom the peripheral system by depressing the lat-
ches on the back edge ol the top and pulling up.
4. Carefully piace the Peripheral Expansion System on its left side
(lhe disk drive compartment now should beat the top).
5. Two screws which support the front casing of the disk drive com-
partment are located o n the top and botto m of the peripheral sys-
tem. Remove these screws and piace the peripheral system in ils
proper upright position.
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BOTTOM VIEW • •