Yamaha Mio, Service Manual

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Page 2: ...5 27C128 EPROM 30 U16 U20 74LS73A 31 U17 MC1489P 34 U18 LM3086 35 U19 74HC4046 36 U22 74LS139 43 U23 74LS158 45 U27 U48 74LS374 47 U28 74LS240 49 U47 U50 RESISTOR NETWORKS 50 DRAM Timing 53 Theory Signals 54 Theory Read Cycle 55 Theory Write Cycle 56 Theory Refresh 57 Programming Information 58 Hardware Description 58 Register Selection Table 59 ACIA Command Register 60 ACIA Control Register 61 RA...

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Page 9: ...ICO 143 S8A T 0 08 DIP SOCKET 16 PIN 10 517 ICO 163 S8A T 0 11 DIP SOCKET 20 PIN 9 517 ICO 203 S8A T 0 11 DIP SOCKET 28 PIN 2 517 ICO 286 S8A T 0 15 25x2 Pin Header Right angle 1 A32706 25 ND 1 74 25x2 Pin header 4 A32707 25 ND 2 12 Female DB9 connector 1 J8 152 3409 0 73 Male DB9 Connector 1 J3 152 3309 0 77 Female DB25 connector 1 J2 152 3425 1 19 Power connector 1 J6 CP 102AH ND 0 36 Power swit...

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Page 59: ... control lines are normally all ones port voltages are 5 which represents a logic false on the bus For more information on SASI SCSI bus protocol refer to the Adaptec ACB 4000 Series User s Manual the XEBEC S1410A disk controller document the Seagate ST225N manual or any other device manual employing these protocols The ACK REQ handshake cycle is performed by the MIO hardware Whenever the data D1E...

Page 60: ...nly 1 bit allowed set at a time B 2 1 Disk Interface ROM B 3 1 Seg 2 of setup MENU B 4 1 R P Handler ROM B 5 1 Seg 1 of setup MENU All bits 0 disable the ROM IRQ sense bits Misc inputs B 0 RS 232 DCD line B 1 RS 232 DSR line B 2 RS 232 CTS line B 3 Printer BUSY IRQ B 4 MIO IRQ from 6551 or Printer BUSY IRQ D1C0 Write ACIA transmit register Read ACIA receive register D1C1 Perform a programmed RESET...

Page 61: ...e 1 Receiver echo mode bits 2 and 3 must be zero for receiver echo mode RTS will be true Bit 3 2 Transmitter Interrupt Control TIC 3 2 0 0 RTS false transmitter disabled 0 1 RTS true transmit interrupt enabled 1 0 RTS true transmit interrupt disabled 1 1 RTS true transmit interrupt disabled and transmit break on TxD Bit 1 Receiver Interrupt Request Disabled IRD 0 IRQ enabled receiver 1 IRQ disable...

Page 62: ... 6 5 Number of bits 0 0 8 0 1 7 1 0 6 1 0 5 Bit 4 Receiver Clock Source RCS 0 External receiver clock non functional on MIO 1 Baud Rate SBR Bits 3 0 Selected Baud Rate SBR 3 2 1 0 Baud Rate 0 0 0 0 16 x RxC Not usable by MIO 0 0 0 1 50 0 0 1 0 75 0 0 1 1 110 0 1 0 0 135 0 1 0 1 150 0 1 1 0 300 0 1 1 1 600 1 0 0 0 1200 1 0 0 1 1800 1 0 1 0 2400 1 0 1 1 3600 1 1 0 0 4800 1 1 0 1 7200 1 1 1 0 9600 1 ...

Page 63: ...the ACIA in which case D1C1 bit 7 should be set Note that the parallel device IRQ mask PDIMSK at 249 is set to 10 by the MIO RAM This is because there is only one interrupt handler which supports all possible MIO interrupts in the ROM In fact the system would crash if the OS tried to enter any of the other ROM banks to service the IRQ Accessing the ROM The ROM on the MIO contains all the software ...

Page 64: ...nfigure D610 DRDATA 64 This contains an array of 8 drive config records each 8 bytes long Records are 0 First physical block address sector number of logical device MSB first 3 Last 1 physical block address sector number of logical device MSB first 6 B 2 0 SCSI SASI ID if hard disk drive number if floppy B 5 1 if floppy drive reassign B 6 1 if RAM drive B 7 1 if Hard drive if B 7 5 0 then ignore 7...

Page 65: ...r memory page number LSB MSB D6C5 CPROFFS 1 Printer queue entry page offset D6C6 PROFFS 1 Printer queue exit page offset D6C7 BADBUFF 1 If 255 this indicates that the queue has wrapped thus repeat copies are invalid D6C8 PRIRQ 1 If 128 then parallel IRQ is enabled This byte gets copied to D6E2 when ROM exited D6CA PRPAUSE 1 If 0 then the printer spooler is paused D6CB PCOPYT 1 Number repeat copies...

Page 66: ...e RS 232 port in pseudo non concurrent mode To remain compatible with the 850 and P R Connection the MIO has a flag indicating whether an XIO 40 set concurrent mode has been performed since the last OPEN command If it has not then the STATUS command returns the state of the handshake lines whereas if in concurrent mode the STATUS command returns the number of characters in the input and output buf...

Page 67: ...e as a normal PRINT statement except that the IOCB precedes the expression Note that the IOCB must be opened for write or read write mode 8 or 12 but whether in concurrent mode or not has no effect on GET INPUT statement operation Refer to your BASIC reference manual for more information on these statements Reading the Port Status Syntax STATUS IOCB DUMMY FLAGS PEEK 746 REM Error bits relating to ...

Page 68: ...imply copies of the next highest bit In the 850 Interface these bits would indicate a history i e not always ready since last STATUS Forcing Early Transmission of Output Blocks Syntax XIO 32 IOCB 0 0 R Remarks This function causes all the buffered data in the computer to be transmitted through the RS 232 port This is used when the user wants to make sure that all data is transmitted before perform...

Page 69: ...u must add the value representing the desired baud rate to the code 0 or 128 for the desired number of stop bits per word Note that the word size is always 8 bits plus 1 or 2 stop bits the MIO R handler does not support smaller word sizes as did the Atari 850 interface The missing baud rates are available through the ACIA on the MIO but are not supported by the R handler since they are never used ...

Page 70: ...ault FEEDS 64 Append LF after CR translation from EOL Setting Concurrent Mode Syntax XIO 40 IOCB 0 0 R Remarks This function simulates the Start concurrent mode I O of the P R Connection and Atari 850 This is needed because of the dual nature of the STATUS command When in concurrent mode the statement returns the size of the data buffers whereas when in block mode the statement returns the state o...

Page 71: ...the special needs of your particular installation Printer Cable Connections 36 pin centronics male DB25P 1 2 1 Data Strobe 2 D0 3 4 3 D1 4 D2 5 6 5 D3 6 D4 7 8 7 D5 8 D6 16 32 18 25 Gnd 15 Fault 11 9 11 Busy 9 D7 Frame to the shield wire No connection to shield MODEM Cable Connections DB25P DB9P 20 8 4 DTR 1 CRX 2 3 3 XMT 2 RCV 7 6 5 GND 6 DSR 4 5 7 RTS 8 CTS Frame to the shield wire No connection...

Page 72: ...s a DCE device not DTE then XMT would connect to XMT and RCV to RCV DTE Serial Printer Cable Connections DB25P DB9P 6 DSR 4 RTS 4 DTR 1 CRX 3 RCV 2 XMT 3 XMT 2 RCV 7 GND 20 DTR 5 GND 6 DSR 5 8 CTS CD 14 FAULT 7 RTS 8 CTS Frame to the shield wire No connection to shield Null MODEM Cable Connections This will allow transfer of files between an MIO serial port and an IBM PC or Atari ST without using ...

Page 73: ...I ST506 412 ST506 412 RLL certified Iomega Alpha 10H Beta xxx SCSI SCSI cartridge drive 10Mb cartridge drive xxMb Rodime RO650 RO652 SCSI SCSI includes drive 10Mb includes drive 20Mb Seagate ST225N SCSI includes drive 20Mb Western Digital WD1002 SHD SASI ST506 412 XEBEC 1410 1410A SASI SASI ST506 412 ST506 412 MIO Service Manual Page 72 ...