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SYSTEM BUS
Option involved in the CUP
System memory (RAM)
Real Time Clock (RTC) ...
1.2.2
I/O CONT
I/O CONT modifies the system bus into the I/O bus in order to
control the circuit of device, option device and desplay controller
which are connected to I/O bus.
Device controllers inside I/O controller is connected to I/O bus,
and address is designated to a certain I/O memory area.
Modified is connected with DISPLAY CONT and optional device
controller as I/O BUS.
—
PIC: To control priority sequence over
I/O interruption from either I/O CONT
or I/O MOTHER (option), as well as to
inform the higher interrupt to the pro
cessor.
—
DMA: For control of DMA data transfer between
an option device and FDD controller in
I/O CONT and system memory.
8
—
ROM: A
RB read-only-memory for hardware initia
lizing, initial checking, OS loading, and
p-debugger.
—
RAM: A system memory with a capacity of 256KB
expandable by 128KB up to 512KB
-- I/O CONT: See 1-2-2
...
Up to 512KB (max.) by expansion of each
bord
Data and time control.
backup of battery when power OFF.
128, 256, 384KB.
1-8
It functions by
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