Sharp MZ-3500 640 x 400 bits display mode FH = 20.92 kHz FV = 47.3 Hz, Setup of GCD master/slave

MZ3500

(2) 640 x 400 bits display mode

fH = 20.92 kHz

fV = 47.3 Hz					X : Y : 1 : 1
	GDC-1 (80 digits)				GDC-2	graphic)
	Character	display (40 digits)		8 bits			16 bits
Dot clock(OD)	(19 66MHz)			19.66MHz	(50.86ns)		9.83MHz (101 92ns)
	(9 83 MHz)
2XCCLK	(4.9152MHz)			4.9152MHz	(203.45ns)		24575MHz (406 9ns)
	(2.4575MHz)
Horizontal display time	32 55^s	80 Chr. /40 Chr.		-			-
HFP		4.88fjs		«-			-
HS		4^is					5Chr.
			*~	(tREF=0.6ms)		*~	(tREF = 1.23ms)
HBP		6 5ys		-			-
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

^^•v^^	Character
^^•\^^ GDC		40 digits	80 digits
Graphic	^^^^
GDC	^"\^
Without VRAM PWB		Character	Character
8 bit structure
48K byte		Character	Ch3rai.te'
200 rasters
16-bit structure
96 K byte		Character	Graphic
48K byte

400 rasters

Master should be setup in the abovei.ia.

(2) I/O signal switching

PIT A ft to

(8255.PB7 )

VFP: 11 rasters (0.5ms)

fiQ /I p ,, ,. ,f c

(CSP - 2)

VSYNC

Switching

Circuit

VS- 5 rasters (0.24ms)

!VBP - 25 rasters (1.2ms)

8.Output method HS, VS. and VIDEO are indpendent outputs.