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This data refers only to the FD-55GFR-149U. There is also a -140 which
looks the same and has the same layout. Perhaps it is basically the
same drive and this data applies to that one as well.
D0, D1, D2, D3 These give the drive address in a daisy chain
configuration.
U0, U1 Used to select turn-on condition of front bezel light (see
below).
IU Jumper to make the signal interface terminal 4 be used
for the IN-USE input signal. When strap is removed, the
input circuit is open and the IN-USE signal ineffective.
ML Selects spindle action according to host command. When
open, spindle rotates only by MOTOR ON input signal. When
jumper is ON motor rotates when (a) MOTOR ON input signal
is TRUE (b) front bezel indicator turns on.
RY/DC Used to select function of READY/DISK CHANGE signal on
terminal 34. When RY jumper ON signal on terminal 34 functions
as ready signal, and it functions as DISK CHANGE signal when
the DC jumper is ON.
LG Used to select meaning of HIGH/NORMAL DENSITY input
signal. When on, LOW level of HIGH/NORMAL DENSITY signals
high density mode. When off, LOW level of HIGH/NORMAL DENSITY
signal designates normal density mode.
I and IS Used to select speed of drive. I strap on: dual speed mode
designated. (360 rpm High Density, 300 rpm Low Density).
Ready state reset once synchronising with a level change of
the HIGH/NORMAL DENSITY signal. Both I and IS OFF, single
speed mode designated. Speed is 360 rpm regardless of
HIGH/NORMAL DENSITY signal. Both I and IS on, dual speed
mode is activated but FDD remains in ready state, regardless of
level change of HIGH/NORMAL DENSITY signal.
E2 Selects output condition of INDEX and READ DATA pulses.When
OFF
pulses are ouput as in (DIAGRAM NOT SUPPLIED). When ON, output
conditions changed to logical expression as follows:
INDEX: Index hole detection * DRIVE SELECT * Ready state
READ DATA: Read data detection * DRIVE SELECT * Ready State
---------------------
* Write operation
FG Connects FDD frame to DC 0V.
Front Bezel Indicator
Selection Jumper Combo. Indicator turn-on condition
1 * * * Drive select
2 IU * U1 Drive select + in-use
3 IU U0 * In use
4 * U0 U1 Drive select + ready
5 IU U0 U1 In use + (drive select * ready)
Notes
Selection
1 Indicator tuns on when DRIVE SELECT signal TRUE
2 Indicator turns on while DRIVE SELECT signal is TRUE or IN USE signal TRUE
3 Indicator on while IN USE signal TRUE
4 Indicator on when DRIVE SELECT signal TRUE and FDD in ready state.
5 Indicator turns on, on conditions 3 or 4
I do not know what the default settings are meant to be.
Mine are FG, D1 and DC jumpered.
On the 3COM web site they make a technical note about these drives (in
document 0000526B) and say D0, I, RY and D3 should be jumpered. (No, I
don't know the significance of jumpering *2* drive address selections.
It does not seem logical.)
Floppy Disk Controller IDC-34 Male
pin assignment pin assignment
1 GND 2 Density Select
3 GND 4 (reserved)
5 GND 6 (reserved)
7 GND 8 Index
9 GND 10 Motor Enable A
11 GND 12 Drive Sel B
13 GND 14 Drive Sel A
15 GND 16 Motor Enable B
17 GND 18 Direction
19 GND 20 Step
21 GND 22 Write Data
23 GND 24 Floppy Write Enable
25 GND 26 Track 0
27 GND 28 Write Protect
29 GND 30 Read Data
31 GND 32 Head Select
33 GND 34 Disk Change
IBM DISK STANDARD CONFIGURATIONS
--------------------------------
Bytes Sectors
per sector Disk Type per Side Sides Tracks
---------- ----------- -------- ----- ------
512 180K 5-1/4" 8 or 9 1 0 - 39
512 360K 5-1/4" 9 2 0 - 39
512 800K 5-1/4" 9 2 0 - 79
512 1.2M 5-1/4" 15 2 0 - 79
512 720K 3-1/2" 9 2 0 - 79
512 1.44M 3-1/2" 18 2 0 - 79
P.S.: Einfach auch mal googlen nach dem Maintenance Manual für die FD-55 Serie ... 217 Seiten ...
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