Sharp MZ-3500 service manual SD3 RAM based Basic, Operational description, Bank, Rom, Moo

MZ3500

2-4. SD3 (RAM based BASIC)

SD3 is active when "SHARP BASIC" is ececutedvia RAM. "SHARP BASIC" is loaded in RAM from the floppy disk.

							MAIN CPU									MSI = 1< H)
																MSO = HH)
RAM	MAS	0	0	0	0	0	0		0	0	I	I	I	!		1
	MA2	0	0	0	0	1	1		1	1	0	0		0	0	1
BANK
	MAI	0	0	1	1	0	0		1	)	0	0		1	1	1
SELECT
	MAO	0	1	0	1	0	1	0	1		0	1	0		1	1

Ffft	I I I	I I I		I I I	lRwnuf%	r
						\\
\	RAMB		RANC		KAMI)	v\
1	2 , 3 , 4	1 , 2	, 3 , 4	1 , 2 , 3 , 4	\ \	\v
gFFF						\\
						N\

-

			,					\ ,	RAM SB KU "°
			RAMA	ROM!		ROM2	KOM3	K(IM4	\\
	1FFF
			]L						ROM 1 PI
	0000
ROM	M02	0 0 0		0	)	i	]
BANK	[NOI	0	0 1	"	1	0	0	1
SELECT	MOO	0 1 0		1 0		1	0

1.Bank select, MAO-MA3. is effective for memory area COOOH-FFFFH.

2.Bank select, MOO-MO2, is effective for memory area 2000H-3FFFH.

SUB CPU

1

vx

\\RAN. SP

\\RAN SC

ROM BAS

k ' SUB CPU

Operational description

The state of the system is determined by the bootstrap program before the load of the system program.