Tandy 1000 Technical Reference Manual

Tandy 1000
Technical Reference Manual
TP7 and TP8 are used for checking various characteristics of the
read/write head and also for the check and adjustment of the head seek
mechanism such as track alignment.
TP7,TP8
(Pre-amp.)
~ L:\ /"---.. A C SV,approx.
~ V"JV
(Fig.319) Typical waveform of TP7 and TP8
(8) TP9, TPlO (Differentiation amplifier)
Test points to observe the differentiation amplifier output signals.
Like the pre-amplifier, the differentiation amplifier also has two
outputs of the order of several hundred mVp-p to several Vp-p which
differ in phase by 180·. Both outputs are observed at TP9 and TPIO
respectively.
For an accurate observation of the waveforms, us~ two channels of
the oscilloscope with one channel set to Invert mode and Add mode of
both channels.
Use G (OV) test point for the oscilloscope ground.
TP9 and TPIO are used for checking the total operation of the read/write
head and the read amplifier and for the check and adjustment of the head
seek mechanism such as track alignment.
TP9,TPlO
(Differentiation
amp.)
(Fig.320) Typical waveform of TP9 and TPIO
(9)
TP G (OV) -- PCBA MFD control, PCBA read write amp.
- 327 -
SV,approx.

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