Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
(k) Confirm that the asymmetry is within the following range.
Innermost track IF asymmetry : 0.6~sec, Max.
(L)
For a double sided FOO, depress "4" key and execute items (i) through
(k) for the side 0 and the side 1 heads respectively. The side is
changed alternately by a depression of "4" key. If side I is selected,
SlOE I indicator of the SKA turns on.
(m) If the value in item (k) or (L) is out of the specified range, adjust
according to the following procedure. The adjustment can be done
only for the PCBA versions or the PCBA revision numbers with the
variable resistor R5 on the PCBA MFO control. No adjustment can be
done without R5.
i) Adjust the variable resistor R5 so that the asymmetry takes the
minimum value by keying in "04".
ii) For a double sided FOO, execute the operation in item i) for both
sides alternately by chainging the side by key "4". The variable
resistor shall be so adjusted that both asymmetry for side I and
side 0 heads take the minimum value.
(n) If the values in items (K) and (L) are out of the specified range in
the PCBA without the variable resistor R5, or if the adjustment in
item (m) cannot be done sufficiently even if R5 is mounted, refer
to item (j) of "General method".
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Tandy 1000 Specifications

General

Processor	Intel 8088
Processor Speed	4.77 MHz
RAM	128 KB (expandable to 640 KB)
Operating System	MS-DOS 2.11
Manufacturer	Tandy Corporation
Release Year	1984
Storage	Single or double 5.25" floppy disk drive (360 KB), optional hard drive
Sound	Tandy 3-voice sound
Ports	Parallel, Serial
Graphics	CGA (Color Graphics Adapter)
Graphics Modes	320x200, 640x200