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Tandy 1000 Technical Reference Manual

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Tandy 1000
MC6845
OPERATION OF THE CRTC
Technical Reference Manual
Timing
Chart
of
the CRT Interface Signals - Timing
charts
of
CRT interface signals are illustrated
in
this
section with
the
aid
of
programmed
example
of
the
CRTC. When values listed
in
Table 4 are programmed into
CRTC control registers,
the
device provides
the
outputs
as
shown
in
the
Timing
Diagrams (Figures 13
through
15).
The screen
format
of this
example
is
shown in Figure
9.
Figure 16
is
an
illustration
of
the
relation between
Refresh Memory Address
(MAO-MA
13), Raster Address
(RAO·RA4)
and
the position
on
the
screen. In this
example,
the
start
address
is
assumed
to
be
"0".
TABLE
4 - Values
Programmed
Into
CATe
Registers
Reg. #
Programmed
Register
Name
Value
Value
AO
H.
Total
Nht+
l
Nht
Al
H.
Displayed
Nhd
Nhd
A2
H.
Sync
Position
Nhsp
Nhsp
A3
H.
Sync
Width
Nhsw
Nhsw
A4
V.
Total
N
vt
+1
N
vt
AS
V.
Scan
Line
Adjust
Nadj
Nadj
A6
V.
Displayed
NVd
NVd
A7
V.
Sync Posit ion N
vSp
N
vsp
AS
Interlace
Mode
A9
Max.
SCan Line
Address
Nsl
Nsl
A10
Cursor
Start
All
Cursor
End
A12
Start
Address
(H)
AI3
Start
Address
(L)
A14
Cursor
(H)
AIS
Cursor
(L)
A16
Light
Pen
(H)
Al7
Light
Pen
fL)
®
MOTOROLA
SelTliconductor
Products
Inc.

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Tandy 1000 Specifications

General IconGeneral
ProcessorIntel 8088
Processor Speed4.77 MHz
RAM128 KB (expandable to 640 KB)
Operating SystemMS-DOS 2.11
ManufacturerTandy Corporation
Release Year1984
StorageSingle or double 5.25" floppy disk drive (360 KB), optional hard drive
SoundTandy 3-voice sound
PortsParallel, Serial
GraphicsCGA (Color Graphics Adapter)
Graphics Modes320x200, 640x200

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