Service manual

_
________ 1
2
:-
3
DOUBLE-DENSITY DISK CONTROLLER .
TO REARRANGE THE DRIVE NUMBERS...
Refer to the following chart and Figure 2-3, and select the configuration that fits your
situation. Configuration E is normally used for transferring data and programs from
hard-sectored disks to soft-sectored disks.
After you select
the configuration you want, refer to Figure 2-4 on Page 2-4 to program
any 48 TPI (H-17-1) drives, or Figure 2-5 on Page 2-5 to program any 96 TPI drives.
[Figure 2-6
on Page 2-6 shows single-sided drives (H-17-1) programmed for connection
to an H-88-1 Controller.] You can do this programming by physically interchanging
preprogrammed drives, interchanging the programming modules, cutting the pro-
gramming
modules (if presently uncut); or by replacing the programming module with a
properly
set dip switch.
DRIVE DRIVE
DRIVE
~
lE:Jbm
1
2
~
~
W '-J
Figure 2-3
TYPES OF DRIVES:
FLOPPY DISK
• 48 TPI (H-17-1)
CONTROLLER BOARD(S)
• 96 TPI (H-17-4) Drive 0
Drive 1 Drive 2
A
H-88-1
48 TPI (H-17-1) only. DS3
DS2
DS1
Internal drive present
B
H-88-1
48 TPI (H-17-1) No drive installed
DS3
DS2
Internal drive absent
C Z-89-37
Either*
DS1 (Z-89-37
DS2
DS3
Internal drive present jumper installed at J4)
D Z-89-37
Either
*
No drive jnstalled
DS1
DS2
Internal drive absent
(Z-89-37 jumper installed
at J7)
E H-88-1
& Z-89-37
Either* DS3 [Drive 0 is
DS1 (Drive 0 connected
DS2 (Drive
COnnElcted
Internal drive present
48 TPI (H-17-1)
to Z-89-37) Z-89-37)
drive connected to
H-88-1. Z-89-37
jumber installed at J6.]
* All drives connected to the Z-89-37 should be of the same type, either 48 TPI (H-17-1) or 96 TPI (H-17-4).