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Tandy 1000 Technical Reference Manual

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Tandy 1000
Technical Reference Manual
MC6845
TABLE
3 -
Typical
80
x
24
Screen
Format
Initialization
of
CRTC
Programmed
Value
Reg.
# Register
File
Program
Calculation·
Unit
RO
H
Total
T
c
102
•.
527
~
53.76
~s
Rl
H
Displaved
T
c
80
•.
527
~
42.16
~s
R2
H
Sync
Position
T
c
86
•.
527
~
45.32
~s
R3
H
Sync
Width
T
c
9
•.
527
~
4.74~s
R4
V
Total
T
cr
25.
645.12
~
16.13 ms
R5
V
Total
Adjust
Tsr
10.53.76
~
54ms
R6
V
Displayed
T
cr
24.
645.12
~
15.48 ms
R7
V
Sync
Position
T
cr
24.
645.12
~
15.48 ms
R8
Interlace
Mode
R9
Max
Scan
Line
Address
Tsl
RIO
Cursor
Start
Tsr
Rll
Cursor
End
Tsl
R12
Start
Address
(H)
R13
Stan
Address
(L)
R14
Cursor
(H)
R15
Cursor
III
Decimal
102 - 1
~
101
80
86
9
25~1~24
10
24
24
11
o
11
12B
128
He.
Nhl
~
S65
Nhd
~
S50
Nhsp
~
S56
Nhsw
~
S09
N
VI
~
S18
Nadi
=
SOA
Nvd = S18
N
vsp
= S18
SOO
Nsl = S08
Soo
SOB
SOO
S80
SOO
S80
Clock
Period
'=' T c =
.527
loiS
Scan
Line
Period
= T
sl
=
(Nht
+
1)
x T c =
102
x
.527
loiS
=
53.76
loiS
Character
Row
Period
= T
cr::
Nsl x T
sl
=
12)(
53.76jJs
=
645.12
IJS
aThese
are
typical
values
for
the
Motorola
M3000
Monitor;
values
may
vary
for
other
monitors.
FIGURE
12
-
INITIALIZATION
OF
CRTc
FOR
80x24
SCREEN
FORMAT
IN
TABLE
3
CLERR
COUNTER
CR
TC
RDOR
REG
RCC
TO
CRTC
REG
INC
COUNTER
LRST
CRTC
l"EG?
$213
$65
..
$50
..
$56
..
$9
$18.,
$1.'IR
.•
$/
.9.'
$/S
0
..
UtB
..
0
..
$08
$81:1
..
$81:1
#:t113
CRTI
I
CRTHIT
$l'l
#$20
$9081:1
0 ...
.",·
$91:18/
0828
NRN
ORG
CLR
E:
LOX
STA 8
LOR
A
STR A
!NX
INC
8
CNP
B
8NE
Stu
ORG
CRTTRB
FCB
FCB
FCB
FOB
END
09213
981:10
CRTI
I
09
901:1/
CRTINT
5F
CE
F7'
A6
87
138
5C
CI
Ie
26
F2
3F
65
I
c-
oo
08se
08013
1:1884
CRTTRB
0898
08813
el'l81
Oill:14
Bl'lO?
1:1809
OOOC
1:18130
01:18E
1:18/l'l
9l'l12
1:1821:1
09213
1:1924
8828
082C
PAGE
081
08881
00002
08883
01:1('184
1:10085
00l'll'l6
00807'
Ol'lOOS
OOt109
00l'l18
1:1801/
00012
08813
l'll'll'l14
1:188/5
00016
08017'
l'lOel8
CRTII
TOTAL
ERRORS
088013
®
MOTOROLA
Semiconductor
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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