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HP 13255
BACKPLANE MODULE
Manual Part No. 13255-91001
REVISED
OCT-12-77
DATA TERMINAL
TECHNICAL INFORMATION
HEWLETT~PACKARD
Printed iin U.S.A.
13255 13255-91001/02
Backplane Module Rev OCT-12-77
1.0 INTRODUCTION.
This section contains design and application information for the Back-
plane Module and establishes the rules for interfacing between the
various functional modules and the backplane (terminal data bus).
The backplane is a printed-circuit board mounted to the bottom of the
terminal base and contains a power supply connector and a number of
printed circuit edge connectors. In addition to providing power to
the functional modules, it supplies the 4.915 MHz System Clock (SYS
CLK) and System Power On (PWR ON) signals. Data, address, and control
signals for communication between the various functional modules is
is also supplied by the Backplane MOdule. The bus is the primary data
path between the processor and memory, display and memory, and the
processor and peripherals (such as the keyboard, data comm, display,
printer, and the CTU). All communication on the bus occurs in a
serially shared mOde, with each byte transfer being an independent
non-interruptaole transaction.
2.0 OPERATING PARAMETERS.
A summary of operating parameters for the Backplane Module is contained
in tables 1.0 through 3.2.
Table 1.0 Physical Parameters
---------------------------------~--~-----------~------~--------~---~-----~-~---
-------------~ --------------------------~---~--------~----~----------~-~-------
Part Size (