Service Manuals, User Guides, Schematic Diagrams or docs for : HP terminal 264x 13255-91249_8085A_Processor_Module_Feb82

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                              BP 13255

                     PROCESSOR (SOS5A-2) MODULE

                    Manual Part 10.   13255-~   292
                              PRllITED    q I :J.4f?
                             FEB-14-S2




        DATA TERMINAL
    TECHNICAL INFORMATION




                                         HEWLETT       ltJ   PACKARD



Printed in U.S.A.
13255                                                                    13255-91252/02
Memory Controller                                                        Rev JUH-23-81




1.0        IHTRODUCTIOII

1.0.1      The Memory Controller Module has been designed to be used in the 2647F
           terminal.   It is used to provide all randoll access aemory space
           required for the terminal environment; this includes variable space as
           well as basic procram and work space.  It is accessed by the processor
           through the terminal bus.

1.0.2      The Memory Controller consists of control and timing circuitry and up
           to tour banks ot eight 64K socketed MOS RAM chips each for a total
           possible capacity ot 256K bytes.

1.0.3      The memory mapping ot the Memory Controller is as follows:     there are
           two optional Ilapping possibilities.    Which is selected depends on the
           presence or absence of jumper Wl.      It Wl is absent, the board i.
           strapped as a 128K byte board which answers to the addresses tor
           variable space and basic space.      It W1 is present, then the Memory
           Controller is strapped to be used in a RAM based terminal environment,
           answering to the terminal code addresses as well as the above mentioned
           variable and basic spaces. These addresses are determined by the state
           ot the three Ilost significant address bits, ADDR16, ADDR17, and ADDR18
           as described below.

2.0        OPERATING PARAMETERS

          

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