Tandy 1000 Technical Reference Manual

Tandy 1000
4-4-9. Check of Resolution
(A) Equipment
Technical Reference Manual
(1) Level disk
(2) SKA or user's system
(3) Oscilloscope (not required when the SKA is used)
(B) Check procedure
(1) General method
(a) Use two channels of an oscilloscope and connect them to TP7 and TP8
(Pre-amp.) on the PCBA MFD control.
Oscilloscope range AC mode, 50mV ~ O.lV
Set both channels, and 2 to the above range. Set either of the
channels to Invert mode and ADD both channels.
(b) Start the spindle motor and install a level disk.
(c) Make the head move to the innermost track.
(d) Execute IF write operation for one rotation of the disk (125KHz of
WRITE DATA frequency).
(e) Measure the average amplitude (V!F) as in Fig.424.
(f) Execute 2F write operation as in item (d) (double in frequency to
that in item (d)).
(g) Measure the average amplitude (V2F) as in Fig.424.
(h) Calculate the resolution by substituting the following expression with
the measured values VlF, V2F, and RESOLUTION calibration value (see
level disk label).
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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