Service manual

2)-2. Block diagram
A23~A0
D7~D0
/AS,/RD,/WR
PHAI,/RESET
MPCA9
MPCA
TPRC1
OPC
INT4#~INT0#
MCRINT
WAIT#
FROS1#,EPROM1#
RASPN1,2
DSEX#
RXDH,TXDH,SCKH
OSO1,OSI1
USACK
MD1,MD2
IRQ0#
SSPRQ#
HTS2,SCK2,STH2
RXD4,RXC4,DSR4#
RXD2,RXC2,DSR2#
RXD1,RXC1,DSR1#
IPLON
OPTCS#
VMEMC#,VIOC#
DSF2#
VWAIT#,EXWAIT#
EXINT0#,EXINT1#
EXINT2#,EXINT3#
BUSY3#,RXD3,TXD3
TRXC3,TXRDY3
TRXRDY3,RXRDY3
DTR3#,RTS3#
VRESC
DTCS,DTST#
LCDWT
USEL2~USEL0, UTST#,
BA15~BA0
BD7~BD0
BWR#,BRD#
BRAS,BRAS#
ST1#~ST6#
LATCH#
SI,SO,CLOCK
PHUP,VHCOM
CSEN#,INH#
TIRQ#
RPE,JPE
PCRES,PFP
RVPON,JVPON
CTBO,CTAO
RAS,RBS,RCS,RDS
JAS,JBS,JCS,JDS
PTRM,PTJM
POPI
TTST1#,TTST2#
IRQ1#
TXD5,RXD5
DTR5#,RTS5#
DSR5#,CTS5#
CD5#,CI5#
DBTST