Sharp MZ-700 manual

~1Z -7CO

At the time of manual reset (with I CTRL I in depression)

a. 8 x 8 dot characters are displayed on the CRT screen of

40 characters (horizontal) x 25 lines (vertical). Displayed

$0000

$1000

$0000

$EOoo

$FOOO

MONITOR (ROM)

SYSTEM

V-RAM

V-RAM

KEY and TIMER PORT

Disable

$0000

-

$1000

$0000

~

SYSTEM ~

SYSTEM

MEMORY CHANGE ' --

Enable

character font is dependent on the 4KB character

generator (ROM).

b. Manages the monitor ROM, DRAM, video RAM, and peripherals (keyboard, timer, ETC.) mapped to the memory.

c.Generates clock to the Z-80A microprocessor.

d.Selects the printer I/O port.

1) CRT controller

There are major variations of colour television systems as described below.

1.NTSC system (Japan, U.S.A., etc.)

2.PAL system (U.K., Germany, etc.)

3.SECAM system (French, etc.)

Because of the different specification requirements above, the MZ-700 may not be suitable for overseas operation.

PAL signal specification

•When the I C T R L I key is in depression, address $0000 through $OFFF and $DOOO through $FFFF become the RAM area.

•With input of the command ":If' when the monitor (ROM) is active, it is switched to the RAM.

e) Floppy bootstrap

$0000	.... -------- ,
				$0000 I
	MONITOR
	(ROM)				SYSTEM
				$1000 ~----~
$1000	f ---------- I
	SYSTEM	iI-
		Iv		LOAD
$DOOO~----~				$0000	, ------ ,
	V-RAM
	V-RAM
$EOoo i-- - -an-dT-IM-E-R-PO-R-l-I
	K Ey
					SYSTEM
$FOoo f ---------- I
	FLOPPYCONTRO~L		-

EnableDisable

•Because the floppy control area is mapped to $FOOO for compatibility with the MZ-80K series, boot begins from the adress $FOOO.

•Map configuration after boot will be considered sepa- rately.

4-2. Memory controller (CRT C)

Both the momory controller and the CRT controller are contained in a single chip custom LSI (M60719), it has the following functions:

	Signal name				Signal frequency
	NTPL				"L"
	LPHI			17.734475		MHz
	CLKN			8.8672375		MHz
	COLR			4.43361875		MHz
	WAD				1.108404688 MHz
	PHIO			3.546875		MHz
	HBLN			15.6113		kHz
	VBLN			50.0363		Hz
		CRT controller system block diagram
			COLR
			HSY
H		NTPL	SYN
			VBLK
CPU		WA	HBLK
			CLK			TV
CPU			LOAD

Oata written in the VAAM

from the CPU is input to

01-08 via the bidirectional

buffer 5245.

Blanking period

To display characters on the CRT screen, the CPU writes the character data ( display code) to the 2KB VRAM-l along with the control signal WR and the color data of that character to the 2KB VRAM- 2. In other words, as the address ($DOOO ,.., $D7FF) is output. The character data is supplied to the VRAM-l input (01-08) via the bidirectional buffer LS245, and the data will then be written when WE is low. The color data is also sent to 01-08 of the VRAM-2 to be written when WE is low.

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