Mz 3500 – Sharp MZ-3500 User Manual
Page 25
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MZ 3500
6) Screen overlay and displaying on two independent
CRT’s
As there are two video output channels it will be pos
sible
to
display
two
independent
screens
on
separate
video display unit Overlay is possible on either of
screens
(See
preceding
item
5)
)
The
following
bit
selection is needed for screen overlay
Address
Data
Internal
Hex
AS
AS
AS
AS
DS DS PS
S gnal name
Function
3
2
1
0
2
0
of CSP
50
0
0
0
0
1
ECHI
Choice of outputting the character screen on CRT1 0 No 1 Yes
ECH2
Cho ce of outputting the character screen on CRT2 0 No 1 Yes
1
EAT2
Choice of whether attribute or cursor be put on the frame that displayed
on CRT2 (0 No 1 Yes)
51
0
0
0
1
SRI
Displays on CRTI the blue elements contained m the VRAM
1
SR2
Displays on CRTI the red elements contained in the VRAM
1
SR3
Displays on CRTI the green elements contained in the VRAM
52
0
0
1
0
1
SR4
Displays on CRT2 the blue elements contained in the VRAM
1
SR5
Displays on CRT2 the red elements contained in the VRAM
1
SR6
Displays on CRT2 the green elements contained in the VRAM
53
0
0
1
1
1
BGC B
1
BGC R
1 Choice of background color display
1
BGC G
54
0
1
0
0
1
COLOR
Color mode
1
1
BODER
Border color mode in effect
55
0
1
0
1
1
08/16
Defines the data size for the graphic RAM (0 8 bits, 1 16 bits)
(5D)
1
40/80
Defines display digits for the character screen
1
<0 40 digits 1 80 digits)
56
0
1
1
0
1
RA-400
Connection of a 400 raster CRT
1
V RAM2
Connection of the 96K bytes VRAM
1
V RAM1
Connection of graphio GDC
57
0
1
1
1
1
1
1
25/20
25 lines/20 lines switching (0 25 lines, 1 20 lines)
5D
1
1
0
1
1
08/16
Defines data size for the graphic RAM (0 8 bits 1 16 bits)
1
40/80
Defines display digits for the character screen
1
(0 40 digits, 1 80 digits)
CSP 1
CSP 2
NOTE Both CRT1 and CRT2 must be high resolution CRT's (640 x 400) or medium resolution CRT’s fC40
y
'tftt))
Output to each CRT may be possible in the following combination .
Output to each CRT may be possible in the following
C R T I
C R T 2
C H ( A T )
G F ( A T )
C H A I ) + ( > ! ^ A T )
C H ( A T )
( . F A T )
C H ( A r j + C . i A l
C H
( . F
C H + ( , I
CH ASCII
GF Graphic screen, including overlay of two graphics
screens
(AT) Attached with attribute