Zenith Data Systems Z-171 PC Series Service Manual page 13

Page 1-7
Introduction and General Information
Specifications
CPU
Processor
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80C88 CMOS 16-bit processor.
16-bit internal.
4.77 MHz.
4K non-volatile RAM; 256K dy-
namic RAM expandable to 640K.
80 x 25 character (640 x 200
pixel) LCD display. Compatible
with the IBM PC color graphics
adapter in text and graphics
modes.
8 ohm, 2-inch speaker.
Asynchronous serial RS-232C
(DB-25 connector) port — | start
bit; 7- or 8-bit word length; 1 or
2 stop bits; selectable baud rates
of 110, 150, 300, 600, 1200, 2400,
4800, or 9600; RD, CTS, DSR,
CD signals recognized; TD, RTS,
DTR signals controlled; full- or
half-duplex operation.
Centronics-compatible _ parallel
output port (DB-25 connector).
Composite video signal (RCA
phono jack) and RGB color video
signals (9-pin D-type connector).
Bus interface to optional expan-
sion chassis.
RJ-11 modular connector.
5.25-inch double-sided, one-
third height double-density