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CPU
Zilog
Table 2-5.
CPU I/O BUs, Signal Definitions
CPU
SIGNAL NAME
TXD7 to TXDO
RXD7 to RXDO
CTS7 to CTSO
DTR7 to DTRO
RTS7 to RTSO
DSR7 to DSRO
TXRTN7 to TXRTNO
DATA7 to
DATAO
DATA STROBE
DATA STROBE-
DATA DEMAND
BUSY-
IFVALID
FAULT-
ON-LINE
F.P. BUSACK
INDICATOR
(Front Panel)
F.P.POWER-ON
INDICATOR (GND)
(Front Panel)
F. P •. POWER-ON
INDICATOR V+
(Front panel)
F.P. NORMAL
INDICATOR
(Front Panel)
DEFINITION
Transmit Data, 8-bits
Receive Data, 8-bits
Clear to Send
Data Terminal Ready
Request to Send
Data Set Ready
Transmi t Return
PIO Data
Data Products Data Strobe
Centronics Data Strobe, Active Low
Data Demand (Data Products)
(Active High)
Printer busy
Interface valid (Data Products)
Paper Empty indication (Centronics)
Online
(Data products)
DMA in process.
Disk or tape controller in control
of bus
Ground for power-on indicator
Indicates system is on
CPU running user process
2-4
Zilog
2-4
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