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ItO Base Address Selection <SWl-6)
Switch 6 on the package at location 1D assigns the I/O addresses for the 930
board.
This switch should be on for 8" floppy disk drives, resulting in I/O
address SOH to 8FH.
For a system with 5" floppy disk drives, switch 6 should
be off, resulting in I/O addresses COH to CFH.
OFF
ON
SW1-6
(~.~.~=====.~~]
ProgramcPdves
Itt?
Switches <SWI)
Switches 1 through 4 on the DIP at location 1D can be read by the program and
are used to identify the type of drive connected to the controller.
Switch 2 is
used by the hardware and must be "on" for 8 inch drives.
Switches 1 through
4
are read
by
the program as Data Bits 7 through 4; an "on" switch is read as a
~
zero.
The settings for all the switches in the package are shown below for
different types of drives •
.s.n.
Drive Type
SWl-l
SW1-2
SWl-3
SWl-4
SW1-5
SWl-6
SWI-Z
SWl-8
1
8" SS
on
on
on
off
off
on
off
on
2
8" DS
on
on
off
on
off
on
off
on
3
5" DS 96 TPI
on
off
on
off
on
off
off
on
4
5" DS 48 TPI
on
off
off
on
on
off
off
on
5
5" SS 48 TPI
on
off
off
off
off
off
off
on
6·
5" DS
??
TPI
on
off
on
on
on
off
off
on
(SS - single sided, DS - double sided, TPI = tracks per inch)
·Controllers shipped loose will be set
in
this configuration.
This set ting allows 48 or 96
TPI and slow step rates.
IMS International
5000 Series Microcomputers/7.01.83/page 76
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