I/O port map | Sharp MZ-3500 specs

M / 3500

7-6. I/O port map

8255 ON SUB CPU BUS

I N

OUT

8255

chip address(0011/xxxxj

Group A: Mode 1

Group B: Mode 0

INPUT P O R T C 7 4 L S 2 4 4

7 4 L S 2 4 4

port address[0100/xxxx]

# 4X

OUT

PA7

PA6

i'A5

I'A4

I'A3

PA2

PA1

PAO

PC7

PC6

PCS

PC4

PCS

PC 2

PCI

PCO

PB7

OPB6

PBS

PB4

PBS

PB2

PB1

PBO

C D S 7 D

C D S 6 D

CDS5D

C D S 4 3

CDS33

C D S 2 D

cosn

C D S O D

DATA8

DATA"

DATA6

I) AT A5

Output	DATA4
	DATA3	Printer
	DATA2
	DATA1
OBF output	ACK T-SET
ACK inputi	ACK
	STROBE	J
	MUS 1C , sustain
1NTR	NOT USE
	ACKC
	STC	Keyboard
	DC
	P / M	CG selection
	SRDY	Sub CPU READY
Output	CLK
	Dm

Clock

STRB

HLT KEY

STK -i

Keyboard

DK J

PUTR

PE Printer

BUSY

Reads the 8255 OBF (PC7) output or timer output.

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Page 73

Image 73

Sharp MZ-3500 service manual I/O port map

Contents

Personal Computer Model Z-350 BACKUP, INIT, COPY, DEBUG, Killall TimerMemory Video Slot Slot2 Refer to the page TIN Circuit DiagramLSI, 1C Cmosic SFDI/F Symbol PresetSdisp Change Disp Base Basic Area RAMSystem User MZ-1D07 MZ3500 System configuration of Model MS1 = D MSO = 0 L Software Memory Configuration Timing of Reset Signal ROM-IPL SD1 System Loading & CP/M Ffff Bank SelectMAO Operational description SD3 RAM based BasicBank ROM Main Memory Mapper Block diagram Relation between MMR main memory This paragraph discusses main CPU I/O Main CPU and I/O portTable below describes address map Main CPU \m 0001MZ3500 Sub CPU and I/O port To Reset Memory mapper MMRSP6102R-001 Block diagramAddress BUS Coab RAS ROW Address Select Line Address Select Signal MZ3500 Memory mapper MMR SP6102R-001 signal descriptionSrdy Pin No RO1B IN/OUTRO2B 1 1 1 1 0 KI1 Dl Do 17 D6 D5 A7 A6 A5A4A3A2AlAO H E X Uhus 1 OD2 Dl 1 1 1 1 1 0 FE do D4 D3 1 1 1 1 1 1 FF 14 I N D3 MZ3500 Memory ROMIPL, RAMCOM, S-RAM select circuit CRT Specification Asci Summary of video display specification Blue Dot pitchDot color designated by Graphic dot KA7 CH ATCH AI +,! AT A r + + G Ascii CG #1 FFF Video RAM Structure of Vram #07FFA Structure of character Vram When read/write from GDC#0000 8bit Read/write by Z-80 via the GDC 640 x 200 dots display mode FV = 60 Hz 16K Setup of GCD master/slave 640 x 400 bits display mode FH = 20.92 kHz FV = 47.3 HzMaster/slave setup by combination O signal switching Graphic V-RAM Address Crtc block diagramPage Master slice LSI CSP-1 SP6102C 002 signal description » CK CSP-1 Block DiagramCSH HSY2 2BLK2 LSI CSP-2 SP6012C-003 Signal Description 3r00 CSP 2 Block DiagramDSP2 OUT CAS OUT GDC Graphic display controller UPD7220 signal description NK-CLC AD15ILC2AT~BTI CSR-1MAGE Structure CG Address Select Circuit Circuit description Vsync Blsc Character Vram select circuit Read/write from the Z-80 to V-RAM Set GDC command code Csrw C 49H -COMMAND Code Return when all parameters were sentWrite C 23H Command Code Vecte C 6CH Command Code Fifo Empty? Explanation 60HVECTE. Dot address is structured on the screen Following manner Dot display program example-1 P4 88H P5 HH I T E C 23HKind of line solid line Outline Floppy disk TJ ILJ n Ci D ci Ici VnVn n nV nnn7 Data MZ3500 MFD interface block diagram 22 «- o Window FDC UPD765 UPD765 signal description MZ350C Trigger motor on of the timer 555 Selects FDDPort used in the MFD interface is as follows MFM recording method Media detection Controls during read, write, seek, and re- calibrate3500 Precompensate Circuit Control during seek and recalibration Purpose String of data Pulses from the FDD Data window VFO circuit Filter Phase Detector Amplifier Window VFO circuit configuration BQA MFM Mode FM mode timing chart \\\\ Aload Side =3DSC \128 76 iy 7 EH 77 / FFHTrack 10 sector Indicates the byte position From the top of directory B144 6145 B146 B147 39 B148 B149 B150 B151 Ii Patat39 B74 B75 1015 Data transmission format General specificationMZS500 Example 7-bits, even parity, 1 stop bit Start AC controlsOFF KTS MZ3500 Data output control8251 AC RXEN,UTR , T X E N 3SOO 9 6.3 200256 128 «--N Wl -» 8253 OUT 8253 AA3 Printer interfacing circuitDAT DS7 Output General description of the parallel interfaceData transfer timing I/O port map Read Hold Clock circuit SchematicWrite Hold SET DIN LSB MSB MZ3500 PD1990AC Block diagram » GETE1 J Mmmil S I C 3500GP I/O SFD 1/F Dipswa SW2 SW1 On on CE332P OFF on MZ1P02 On OFF IO2824 OFF OFFSEC FD2 \f Canbe in either state Functions Block diagramDescription of each block +5V Switching regulator Timing chart Alarm generation circuit At rrn Specification of keyboard controlKey 2s 2s22 21 Key search timingKey Strobe 22.5/-s 132.5Protocol Key to sub CPU Keyboard controller basic flow XTAL1 XTAL2 Reset INT Keyboard controller signal descriptionPIN ALE DBO DB7 GND On OFF Sub-CPU side Procedure CRT inter face test Shared RAMAbnormal S C I I 00-FF 1 5 c * O DR O.7 Abnormal test endingReady O.H ROM-IPL Main CPU Checker Flow Chart 1/2 100 Main CPU Checker Flow Chart M? M7*500 101 Keyboard test Keyboard controller ROM test IPL Flow Chart SEEK, Read Error Jump \ Boot Address SystemError Load Iocs SEEK& Read 105 SUB CPU IPL Flow Chart R R R R F1 LJ LJ LJ LJ LJ LJ LJ U J l J J L i J L L j l J J L l J L L l LU LU U LJ LlJ LJ U U AIO IwCRoB MZ-35OO Parts Guide LI LED PWB No Parts CodeS C R I P T I O N IE--or Ooss-zw Parts Code MZ-3500N T K Qcnw S C R I P T I O N Connector NO. Parts Code MZ-3500Parts Code A a N a D NEW VH S N 7 4 0 6 N Mark Rank Part S C R I P T I O NCoos M2-3500 J9, MZ1K02,1K03,1K04,1K05 Key unit LSI RAM SOCLA a NO. Parts Code D e Tin N a a Parts Code MZ-3500 Sharp Corporation