Epson 4S - Manual (Page 9)

Epson EL 4S/33+
Option card riser hard connector pin assignments (S1) (continued)
*Active low logic
*Active low logic
SIMM sockets (RAM1, RAM2, RAM3, RAM4)
Use only 30-pin, 8-bit or 9-bit, fast-page mode SIMMs
(preferably tin-plated) that operate at an access speed of 70ns
(nanoseconds) or faster. SIMMs must operate at the same
speed.
Installation/Support Tips
Installing Diskette Drives
Make sure that the drive type has been correctly selected in
the SETUP program.
Installing Hard Disk Drives
When installing a hard disk drive, see the hard disk drive
type tables on pages 5 and 6 and use the auto-sensing
feature in SETUP to select the correct type number for the
drive. If the auto-sensing feature does not produce a
match for the drive, you can define your own drive type
by selecting User Def 1 or 2 as the type and entering
the drive’s exact parameters.
It is recommended that a 16-bit, AT-type hard disk
controller be used if you are installing a drive that cannot
use the embedded IDE interface. If you install a non-IDE
hard disk drive and controller card, you need to disable
the built-in IDE hard disk drive interface by moving
jumpers J21 and J30 to position 2-3.
If you plan to install two hard disk drives in the internal
bays, you must use flat-head screws (#6-32UNC x 8
FH,M,+) to secure the top drive to the mounting bracket.
If you are installing an ESDI hard disk drive, make sure
you disable the built-in IDE hard disk drive interface by
moving jumpers J21 and J30 to position 2-3. Also be sure
to remove the hard disk drive ribbon connector from the
system board.
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