Tandy 1000 Technical Reference Manual

Tandy 1000
4-4-13. Check and Adjustment of Index Burst Timing
(A) Equipment
Technical Reference Manual
(1) Cross point screwdriver, M3
(2) Alignment disk
(3) SKA or user's system
(4) Oscilloscope (not required when the SKA is used)
(5) Locking paint
(B) Check and adjustment procedure
(1) General method
(a) Use two channels of the oscilloscope. Connect the 1st channel to TP4
(Index) on the PCBA MFD control and the 2nd channel to TP7 or TPB
(Pre-amp.). Apply positive trigger by TP4.
Oscilloscope range
The 1st channel: DC mode, 2V, 50~sec
The 2nd channel: AC mode, IV, 5~sec
(b) start the spindle motor and install an alignment disk.
(c) Set the head to track 01.
(d) Measure "t" in Fig.430.
(e) Substitute the following equation with the measured value in item
(d) and INDEX TIMING calibration value (see alignment disk label).
Index burst timing (true value)
Measured value - Calibration value(~s)
- 40B5 -

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