Sharp MZ-700 manual System Description

4.SYSTEM DESCRIPTION

4-1.Memory map a) At power on

$0000

MONITOR (ROM)

$1000 MONITOR WORK $1200

SYSTEM

and

TEXT AREA

(DRAM)

$0000

V·RAM<CHARACTER>

(SRAMI

$0800

V·RAM<COLORDATA>

$0000

$1000

$0000

SYSTEM (DRAM)

and

TEXT AREA

•Boot command: L

•With the entry of the boot command L, only the tape loading program is transferred to the system area and the system program is loaded to the system area designated in the DRAM.

NOTE: The boot program shown in the figure is the program loaded from the tape and is not the program from the monitor (ROM).

c) System initiation

$0000$0000 , ----- ,

MONITOR

(ROM)SYSTEM

$EOoo

(SRAMI

$1000$1000 ----------------------

SYSTEM

KEY and TIMER PORT

$FOoo

FLOPPY CONTROLLER

Enable

and

TEXT AREA

(DRAM)

Disable

.$0000 , ------- , $0000 ---------------------------

V·RAM

V·RAM

•Shown above is the memory map at the time of power on. VRAM contents from$DOOO to $DFFF differ from

the MZ·80K.

•The monitor (ROM) has the same entry point as that of the MZ·80K.

b)Bootstrap (loading of system program)

$Eooo I--KE-Y-ond-TI-M-ER-P-OR-T-l

:$Fooo 1 -------- 1

DisableEnable

$0000

$1000

$7EOD

$0000

MONITOR	Ir--
(ROfv\)	1'		-
SYSTEM
Boot PROGRAM	~
		'11

$0000

LOAD

$0000

SYSTEM

•The above memory map is valid upon completion of system program loading.

•The system program is programmed to switch the memory depending upon what is accessed, VRAM, keyboard, or timer.

d) At the time of manual reset

$EOoo

V·RAM

V·RAM

KEY and TIMER PORT

SYSTEM

$0000

$1000

$0000

MONITOR (ROM)

SYSTEM

$0000 I SYSTEM

$1000 ~----- ~

$0000 , ------- ,

EnebleDisable

•With the input of the LOAD command of the monitor, the BASIC loading program is transferred to the system area composed of the RAM and starts to bootstrap. (Only the cassette tape is subject to bootstrapping in this case).

$EOoo

$FOoo

V·RAM

V-RAM

KEY and TIMER PORT

SYSTEM

EnableDisable

4