Sharp MZ-3500 service manual Main CPU and I/O port, This paragraph discusses main CPU I/O

Page 14

MZ3500

3-2. Main CPU and I/O port

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							This paragraph discusses main CPU I/O
					Connector		Port select and addressing.
						I PC 2	The address output from the main CPU
	A2				~^T		1 is decoded in the 74LS138 to create the
	A3	j^		""	v		select signal.
	A3			~s	f^-r-^r-.—r		Table below describes address map and

			Y 1
	A4		Y 1	~~>	\J>	-•> r DL	signal functions.
	A4

			iZ	J	\J I Obr
—££-1
A6	A v~\ r	(jtA.	Y3
M	P C
	IORQ		Y4	-)	f\
	IORQ	G2 B	Y4	J	-\J
		G2 B
			Y5	^	0 MFUC
	M i	Ol	Y6		• \J	lUMr
		Ol	Y6		• \J	lUMr

5 O IOABCMEMORY MAPPER)

74LSI38

ADDRESS

A7 A6 A5 A4 A3 A2 A1 AO									HEX
0	0	0	0	0	0	0	0		00
0	0	0	0	0	0	0	1		01
										NOT USE
1	1	0	1	1	1	1	0		DE
1	1	0	1	1	1	1	1		DF
									EO
^	^		^	Q		o	o	x	x	NOT USE
									E3
									E4
^	^		^	Q		O	•	^	x	x SFDC (UPD765)
									E 7
									E8
i	i	i	o		t	o	x	x		IOSF
									EB
									EC
1 1 1 0 1					1	X .	X			INTR
									EF
									FO
1	1	1	1		Q	O	X	X		NOT USE
									F3
									F4

SFD interface FDC chip select.

AO used for RD and WR.

A1 is "don't care".

SFD interface I/O port and DMAC chip select.

Interrupt signal from the sub-CPU to the main CPU. Flipflop resetting signal.

1 1 1 1 0 1 X X

MFDC (UPD765)

MFD interface FDC chip select.

F 7

								F8
1	1	1	1	1	0	X	X	IOMF
								F B
								FC
1	1	1	1	1	1	X	X	IOAB (MEMORY MAPPER)
								F F

MFD interface I/O port.

AO used for RD and WR.

AT is "don't care".

I/O port select in the memory mapper. AO and A1 used during ~W5. WR.

Image 14

Contents Personal Computer Model Z-350 Memory TimerBACKUP, INIT, COPY, DEBUG, Killall VideoLSI, 1C Cmosic Refer to the page TIN Circuit DiagramSlot Slot2 SFDI/FSdisp PresetSymbol Change DispSystem Basic Area RAMBase UserMZ-1D07 MZ3500 System configuration of Model Software Memory Configuration MS1 = D MSO = 0 LTiming of Reset Signal SD1 System Loading & CP/M ROM-IPL MAO Bank Select Ffff Bank SD3 RAM based BasicOperational description ROMBlock diagram Relation between MMR main memory Main Memory MapperTable below describes address map Main CPU and I/O portThis paragraph discusses main CPU I/O MZ3500 0001Main CPU \m Sub CPU and I/O portAddress BUS Memory mapper MMRSP6102R-001 Block diagramTo Reset CoabSrdy MZ3500 Memory mapper MMR SP6102R-001 signal descriptionRAS ROW Address Select Line Address Select Signal Pin No RO2B IN/OUTRO1B D2 Dl 1 1 1 1 1 0 FE do D4 D3 A7 A6 A5A4A3A2AlAO H E X Uhus 1 O1 1 1 1 0 KI1 Dl Do 17 D6 D5 1 1 1 1 1 1 FF 14 I N D3MZ3500 Memory ROMIPL, RAMCOM, S-RAM select circuit Specification CRTSummary of video display specification AsciDot color designated by Dot pitchBlue Graphic dotCH AI +,! AT A r + + G CH ATKA7 #1 FFF Ascii CGVideo RAM Structure of Vram #0000 Structure of character Vram When read/write from GDC#07FFA Read/write by Z-80 via the GDC 640 x 200 dots display mode 8bit16K FV = 60 HzMaster/slave setup by combination 640 x 400 bits display mode FH = 20.92 kHz FV = 47.3 HzSetup of GCD master/slave O signal switchingCrtc block diagram Graphic V-RAM AddressPage Master slice LSI CSP-1 SP6102C 002 signal description CSH CSP-1 Block Diagram» CK LSI CSP-2 SP6012C-003 Signal Description HSY2 2BLK2DSP2 OUT CSP 2 Block Diagram3r00 CAS OUTGDC Graphic display controller UPD7220 signal description AT~BTI AD15ILC2NK-CLC CSR-1MAGECG Address Select Circuit StructureVsync Circuit descriptionCharacter Vram select circuit BlscSet GDC command code Read/write from the Z-80 to V-RAMWrite C 23H Command Code Vecte C 6CH Command Code Return when all parameters were sentCsrw C 49H -COMMAND Code Fifo Empty?VECTE. Dot address is structured on the screen 60HExplanation Following manner Dot display program example-1Kind of line solid line I T E C 23HP4 88H P5 HH Floppy disk OutlineTJ ILJ n VnVn n nV nnn7 Ci D ci IciData MZ3500 MFD interface block diagram FDC UPD765 22 «- o WindowUPD765 signal description Port used in the MFD interface is as follows Trigger motor on of the timer 555 Selects FDDMZ350C MFM recording method3500 Precompensate Circuit Controls during read, write, seek, and re- calibrateMedia detection Control during seek and recalibrationVFO circuit Purpose String of data Pulses from the FDD Data windowVFO circuit configuration Filter Phase Detector Amplifier WindowMFM Mode BQAFM mode timing chart \\\\ 3DSC Side =Aload Track 10 sector 76 iy 7 EH 77 / FFH\128 Indicates the byte position From the top of directory39 B74 B75 Ii PatatB144 6145 B146 B147 39 B148 B149 B150 B151 1015MZS500 General specificationData transmission format Example 7-bits, even parity, 1 stop bitOFF AC controlsStart 8251 AC MZ3500 Data output controlKTS 3SOO RXEN,UTR , T X E N256 2009 6.3 128Wl -» «--N8253 8253 OUTDAT Printer interfacing circuitAA3 DS7Data transfer timing General description of the parallel interfaceOutput I/O port map Write Hold SET Clock circuit SchematicRead Hold DINMZ3500 PD1990AC Block diagram LSB MSBMmmil » GETE1 JGP I/O 3500S I C SFD 1/FSEC SW2 SW1 On on CE332P OFF on MZ1P02 On OFF IO2824 OFF OFFDipswa FD2\f Canbe in either state Description of each block Block diagramFunctions Switching regulator +5VAlarm generation circuit Timing chartKey Specification of keyboard controlAt rrn Key Key search timing2s 2s22 21 StrobeProtocol Key to sub CPU 132.522.5/-s Keyboard controller basic flow PIN Keyboard controller signal descriptionXTAL1 XTAL2 Reset INT ALE DBO DB7 GNDOn OFF Procedure Sub-CPU sideAbnormal Shared RAMCRT inter face test S C I I 00-FFReady O.H Abnormal test ending1 5 c * O DR O.7 ROM-IPL Main CPU Checker Flow Chart 1/2 Main CPU Checker Flow Chart M? 100101 M7*500Keyboard controller ROM test Keyboard testIPL Flow Chart Error Jump \ Boot Address SystemSEEK, Read Error Load Iocs SEEK& ReadSUB CPU IPL Flow Chart 105LJ LJ LJ LJ LJ LJ LJ R R R R F1LU LU U LJ LlJ LJ U U U J l J J L i J L L j l J J L l J L L lRoB IwCAIO MZ-35OO Parts Guide LI S C R I P T I O N No Parts CodeLED PWB IE--or Ooss-zw N T K MZ-3500Parts Code QcnwConnector S C R I P T I O NParts Code MZ-3500NO. Parts Code A a N a DVH S N 7 4 0 6 N NEWCoos Part S C R I P T I O NMark Rank J9, MZ1K02,1K03,1K04,1K05 Key unit M2-3500LA a SOCLSI RAM NO. Parts CodeD e Tin Parts Code N a aMZ-3500 Sharp Corporation