Features; In Te R Face To Sys Tern - HP 3000 Series Installation And Service Manual

General Information
1-4. Features
Important features of the INP are:
• Hardware data transfer rates to 56,000 bits per second.
•
32 K bytes of random access
support program storage
buffer ing •
memory
and for
(RAM) for
character
dr ive r a n d
and message
• 4 K bytes of read-only memory (ROM).
• Protocol and link
intervention.
processing without computer system
• High-speed, silicon-on-sapphire (SOS) microprocessor.
• Compa tible wi th IBM Bi nary
protocol.
Synchr onous Comrnun ica t ions
• EIA RS232C, and CCITT V.24 and V.35 compatibility.
• Full- or half-duplex operation.
• Compatible with HP 37210T and HP 37220T moderns and with Bell
201, 208, and 209 modems.
• Direct-connect capability between two
HP
3000 computers.
• Retention of buffered data during power fail/restore periods.
• Stand-alone, user-initiated, self-test capability.
1-5. Interface to System
The HP 30020A INP has one PCA board that is backplane compatible
with the HP 3000 Series 30 and Series 33 Computer Systems. The
INP PCA is ins taIled in the "de vice" section of the I/O card
cage. The INP communicates with the General I/O Channel (GIC)
via connector J 3, and with the modern via connector s Jl and J2.
(See figure 1-2.) The INP receives power from the system via con-
nectors P2 and P4. Connector PI is used for test signals, and
connector P3 is not currently used.
1-5