Table of Contents
Advertisement
Hardware Overview
1-2
\1.'\I~
LJNIT
r
I
I
PO\\'ER Sl'PPLY
5 LPiELS
SySTEM CLOCK
(4.9152!\.UIz)
'VIKROPROO.SSOR
(8086)
RAM
nYNAMIC MEMOR\
(pPD4164)
128 KB
I
B,I"THRY-SACKED
MEMOR\
(pPD449)
4 KB
Rf<A.D ONLY MUIIORY
(2732)
8 KB
TIMER
(8253)
BATTERY-BACKED
CAU;NDAR
A~()
CLOCK CO"- I ROL
PRO( ESSDR PCB ((;9PFBl)
Figure 1-1 System Block Diagram
• A IS-channel Interrupt System
• Printer and Keyboard Controllers
- - - - - l
4
CHA~NEL
DMA
(8237)
15
CHA~"'EL
INTR
(8259)
PARALLEL BUS
I
I
I
I
"RINTER CONTROL
J---
I
(8255)
KDnOARD CON'IROL
--~
AUER~A1E
I/O
CONTROLLER~
(OPTlO"'iALj
• Calendar-and-Clock Controller, which keeps track of the month, date, day
of week, hour, minute, and second, and runs on battery power when ac
power is off, thus preserving the time/date setting.
The Controller PCB contains as standard equipment:
• CRT Display Control, which can generate 250 predefined characters and
allows you to create and store on disk any number of sets of 256 other
special characters
NEe MODEL AP(
DOT MHRIX PR Ir"I I ER
NEt SPINWRIHR MODEL 3530
Ft
LLY FORMED CHARAClER
PRINTER
MODEM OR OTHER
RSB2 ASYNCURO"'Ol S,
SY"CHRO~OL'S.
OR IWSI'\ESS
"'ACHINt: DFVI(T
Advertisement
Table of Contents
