Z80 Datasheet, PDF (324/330 Pages) Zilog, Inc. – Z80 CPU PERIPHERALS

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304
System Bus
(Data, Address, and Control)
System
Memory
Ch.A
Z80
SIO #1
Ch.B
SIO Clock
Generator
and
Time Out
Counters
RS 232
Drivers/
Receivers
RS 232
Drivers/
Receivers
Keyboard
Display/
Console
RS 232
Drivers/
Receivers
Line
Printer
Z80
PIO
Z80
SIO
Z80
CTC
Intelligent
Terminal
Z80
CPU
and
Memory
Terminal
Bus
Terminal Interfaces
Z80
CPU
RxCA
TxCA
Ch.A
Z80
SIO #2
Ch.B
RDY
RS 232
Drivers/
Receivers
RS 232
Drivers/
Receivers
RDY
Z80
DMA
Terminal Interfaces
High-Speed ^{Communications Link}
Modem
(SDLC Protocol)
To Remote
Processor
Figure 127. Data Concentrator
UM008101-0601
Serial Input/Output