Sharp MZ-3500 - Manual (Page 31)

Mzasoo
(2) 640 X 400 bits display mode
fH = 20.92 kHz
fV = 47.3 Hz
O --------
X : Y : 1 : 1
GDC-1 (80 digits)
Character display (40 digits)
GDC-2
8 bits
graphic)
16 bits
Dot clock (OD)
(19 66MHz)
(9 83 MHz)
19.66MHz (50.86ns) 9.83MHz (101 92ns)
2XCCLK
(4.9152MHz)
<2.4575MHz)
4.9152MHz (203.45ns) 2 4575MHz (406 9nsl
Horizontal display time 32 55^s 80 Chr. /40 Chr. - -
HFP 4.88 ms - -
HS 4 ms
(tREF=0.6ms)
5 Chr.
^ (tREF = 1.23msl
HBP 6 5 ms - -
Vertical display time 19.16ms - -
VFP 0.527ms - -
VP 0.24 ms
VBP 1.198ms -
Total rasters; 441 rasters
Display rasters 400 rasters
(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
9. HS, VS, and VIDEO signals are supplied from the LS
type TTL 1C (totem pole)
6) Setup of GCD master/slave
(1) Master/slave setup by combination
( Neijanve)
V ideo
( P om t ive
IT TJ
Character
GDC
Graphic
GDC
40 digits 80 digits
Without VRAM PWB Character Character
8 bit structure
48K byte
200 rasters
Character Characie-'
Graph ic
16-bit structure
96K byte
48K byte
400 rasters
Character
vs _
( Negaijve)
Video
: PoMl.Ve
* Master should be setup in the above (..a..
(2) I/O signal switching
CH48-
- ----19 I6ms
( VFP: 11 rasters (0.5ms)
< VS’ 5 rasters (0.24ms)
( VBP' 25 rasters (1.2ms)
8. Output method HS. VS. and VIDEO are indpendent
outputs.
(8255,PB7 )
08
/
16
-
(CSP-2)
VSYNC1
VSYNC
Switching
Circuit
' VS'i \C2
34 -