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-
M Z 3.')()O
(2) 640 x 400 bits display rnode
fH
~
20.92 kHz
fV
~
47.3 Hz
X: Y: I
GOC-1 (80 digits)
GOC-2 (graphiC)
Character display (40 digits)
8 bits
16 bits
Dot clock (OD)
(1966MHz)
(983 MHz)
2XCCLK
14.9152MHz)
(2.4575MHz)
- -
Horizontal display time
HFP
HS
HBP
Vertical display time
VFP
VP
--~-~--
VBP
Total rasters: 441 rasters
Display rasters 400 rasters
- - -
3255)Js
I
80 Chr. /40 Chr.
4.88)Js
41'S
65)Js
19.16ms
0.527ms
0.24 ms
1.198ms
(3) CRT synchronizing signal specification (400 raster
CRT)
1. Horizontal synchronization frequency (fH): 20.92kHz
2. Vercial synchronization frequency (fV): 47.3Hz
3. Total rasters: 441 rasters
4. Rasters used: 400 rasters
5. Display dots: 640 x 400 dots
6. Dot clock: (19.66MHz)
7. Timing
Ii~
(Neg:lI('vt")~
Vlck-O
( P ( ) ! O ' l t l v e ; - - - - - - '
47
8~
...
- - - - -
u
-325 ..
<;
- - -
, . . . . . . - - - - - - 21 I
m ....
~-
-------.....-.....,
-
J...-024rn~
vs
(Negatlvt')
u
U
---: 12r1l''':'''-
- - 05m"':--
{I>o~~~:~:
;-------'
- - -
l!:il(im ....
--,
{
VFP: 11 rasters (0.5rns)
VS-
5 rasters (O.24ms)
VBP' 25 rasters (1.2rns)
8_ Output rnethod
HS, VS, and VIDEO are indpendent
outputs_
19.66MHz (50.86ns)
9.83MHz (101 92ns)
4.9152MHz (203.45ns)
2 4575MHz (<106 9nsl
~
~
~
~
5 Chr_
~
(tREF=O.6ms)
-
(tR E F
=
1.23ms)
~
~
~
~
~
~
.....
-
.....
~-
9. HS, VS, and VIDEO signals are supplied frorn the LS
type TTL IC (totem pole)
6) Setup of GCD master/slave
(1) Master/slave setup by combination
~
GDC
40 digits
80 digits
Graphic
GDC
Without VRAM PWB
Character
Character
8 bit structure
48K byte
Character
i
Choral Ye..-
!
200 rasters
I
I
I
I
~-
.
--
----l
16-bit structure
,
96K byte
Character
GraphiC
J
48K byte
400 rasters
• Master should be setup in the
abov~ IHd,d!]'.
(2) I/O signal switching
CH48
(8255.PB7
)
08/16
(CSP-2
VSY:\CI
)
VSYNC
Switching
Circuit
-34-
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