Tandy 1000 Technical Reference Manual

Tandy 1000
TP4 (Index)
TP7 or 8
(Pre-amp. output)
Technical Reference Manual
=te'--b-u-r-s-t-d-e-l-a-y------
(Fig.3l6) Typical waveform of TP4 (Burst timing observation)
(5) TP5 (Read data)
Test point to observe the read data pulse.
The signal level at this TP is opposite to that of the READ DATA output
signal.
TPS (Read data)
2F interval
4 3F interval
lF interval
Pulse wi
(Fig.3l7) Typical waveform of TP5
Fig.3l7 shows the waveform at TP5 in normal data read operation.
In the FM method, 2F and IF intervals are observed, while 2F, 4/3F, and
IF intervals are observed in the MFM 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