The
remaining
Computer
circuits
operate
the
same
on
both
versions.
3.
Encoder/Decoder
Circuit
The
entire
Encoder/Decoder
circuit
on
the
VIC-1541
has
been
replaced
by
UCl
on
the
1541.
Internally,
UCl
performs
the
same
functions
as
the
following
!C's
did
on
the
VIC-1541:
UE3,UF4,UE5A,UE5B,UF3,UC1B,UF5B,UF5A,UC2,UD2,UC3,UE4,UD3
and
UF6B.
4.
Read
Circuit
UF6A
on
the
VIC-1541
has
been
replaced
by
pins
23,24
and
25
of
UCl
on
the
1541.
The
remainder
of
the
Read
circuit
operates
the
same
on
both
versions.
5.
Write
Circuit
UC1D,Uf5D,UF5C
and
UG2C
on
the
VIC-1541
have
been
replaced
by
pins
2,40
and
6
of
UCl
on
the
1541.
The
remainder
of
the
Write
circuit
operates
the
same
on
both
versions.
6.Track
Select
Circuit
UE2
and
UF2D
on
the
VIC-1541
have
been
replaced
by
pins
5,15,16,17
and
18
of
UCl
on
the
1541.
The
remainder
of
the
Track
Select
circuit
operates
the
same
on
both
versions.
7.
Power
Supply
Circuit
Other
than
differences
in
capacitor
values
and
in
the
number
of
bypass
capacitors,
there
are
no
changes
in
the
operation
of
the
Power
Supply
circuit.
The
1541
requires
fewer
bypass
capacitors
than
the
VIC-1541
because
it
has
fewer
IC's
to
bypass.
8.
Optics
Circuit
There
are
no
differences
in
operation
of
the
Optics
circuit
between
the
two
versions.
9.
Drive
Motor
System
There
are
no
differences
in
operation
of
the
Drive
Motor
System
between
the
two
versions.
Initial
Configuration
On
the
1541,
the
device
number
programming
pads
are
located
near
the
front
of
the
Disk
Controller
PC
Board.
Refer
to
Figure
B-2.
Performance
Test-no
change.
Calibration-no
change.
Disassembly/Reassembly-no
change.
Preventive
Maintenance-no
change.
Page
F-2
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