Table of Contents
Advertisement
SYSTEM BUS
m P
— I CENTRO CONT]
— I TIMER
— I BAUD RATE
— I KEY INPUT
— I SPEAKER AMP I
— T_ RS232C-T]
I/O BUS
Option in I/O CONT
RS232C-2 ------ Serial data interface output to 0PT5 port.
CONTI
With FDC yPD765AC, four floppy disk
drive FDD is controlled via DMA data
transfer.
this FDD CONT are 5" FDD 5" x 2 and
8
FDD
" x 2.
Respective interfaces of these FDD
units are different from each other,
so
each of these units has its
interface circuit.
Controls the centronics interface of
8
-bit parallel data bus and allows
connection of mainly the printer with
a centronics interface.
Software timer for firmware of CPU.
Provides three different frequency
pulse signals which varied by
firmware of CPU.
Output to change tone of speaker
output and a data transfer clock pulse
to RS 232C of *1.
Converts Key matrix code which is
to be serially transferred from the
keyboard,and, then to the parallel
code.
Converted parallel code is directly
transferred to CPU.
Firmware of CPU converts it to
internal code and controls the repeat
function.
500 Hz
RS232C-2 serial interface (option)
Bus driver and bus control
1-9
FDD units connected to
4 KHz sound generating circuit
8
"
Advertisement
Table of Contents
