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HP 13255
UNIVERSAL MEMORY MODULE

Manual Part No. 13255-v1171
REVISED
DEC-26-78

DATA TERMINAL
TECHNICAL INFORMATION

HEWLETT~PACKARD

Printed in U.S.A.
13255 1325,-91171/02
Univ~rsal Memory Module REV DtC-26-78

1.0 INTRODUCTION.

1.0.1 The Universal Memory ModuLe is used in the 264XX Terminals
for Display Memory or Program ~emory. This read-write memory
is normally only accessible through the terminAL bus (ROT). If it is
connected to the Processor Module top plane it is then only accessible
through the top plane bus (TOP).
1.0.2 The universal Memory MOdule consists of t~o completely independant
m~mory modules which each use 8 16-Pin so~eted ~OS RAMS. The mOdules
may be configured with 16K R~MS or~anized as 16,384 X 1 bit or 4K RAMS
organized as 4,096 X 1 bit giving the following Universal Memory
Module standard sizes.
8K 0 2 4K modul~s
16k 0 1 16k module, 1 vacant module
32k 0 2 16k modules

1.0.3 The memory mapping of the Universal Memo~y Module is unrestricted
with the following exceptions:
o In BOT or TOP mode the memory in the memory mapped 1/0 space
I/O space (32K-36K) can only be used with an enhanced version of
the Processor Module.

o In BOT mode the module can overlay the 0-64K space occupied by TOP
Read only memory (ROM) or Random access memory (RAM) in which case
the BOT access is obtained by firmware inhibiting the TOP me~ory
-this can only be done if the TOP memory is ~ddressable as all RAM or
all ROM.

o In TOP mode the module can occupy the same 0-64K space as TOP ROM,
if none is present a second Universal ~emory Module addressed as ~OM
(but functioning as RAM) may also be used.
o In TOP mode Bank Switching is possible using an enhanced
v~rsion of the Pracessor Module and the 16K or 32K confiqurations of
Universal Memory module. This permits up to 4 memory modules to
the overlay the 0-64K TOP memory space. Bank Switching can only be
used with an enhanced version of the Processor Module.
HP 13255
UNIVERSAL MEMORY MODULE

Manual Part No. 13255-91171
REVISED
OEC-26-78

----------.----------------------~---~----~--~~-----------~-------
~OTICE

The information contained in this document is subject to change
without notice.
HEWLETT-PACKARD MAKES NO WARRANTY OF ANY KINu WITH QEGAPD TO THIS
MATERIAL, INCLUDING, BUT NOT LIMITED TO THE INPLIEO WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Hewlett-Packard
shall not be liable for errors contained herein or for incidental or
consequential damages in connection with the furnishing, performance,
or use of this material.
This document contains proprietary information which is protected OY
copyright. All rights are reserved. ~o part of this document may be
photocopied or reproduced without the prior written consent of Hewlett-
Packard Company.

NOTE: This document is part of the 264XX DATA TERMINAL product
series Technical Information Package (HP 13255).
13255 1325,-91171/02
Universal Memory Module REV DcC-26-78

1.0 INTRODUCTION.

1.0.1 The Universal Memory Module is used in the 264XX Terminals
for Display Memory or Program ~emory. This read-write memory
is normally only accessible through the terminAL bus (ROT). If it is
connected to the Processor Module top plane it ;s then only accessible
through the top plane bus (TOP).
1.0.2 The Universal Memory MOdule consists of t~o completely independant
me~ory modules which each use 8 16-Pin so~eted ~OS RAMS. The mOdules
may be configured with 16K R~MS organized as 16,384 X 1 bit or 4K RAMS
organized as 4,096 X 1 bit giving the following Universal Memory
Module standard sizes.
8K 0 2 4K modules
16K 0 1 16K module, 1 vacant module
32K 0 2 16K modules

1.0.3 The memory mapping of the Universal Memor'y Module is unrestricted
with the following exceptions:
o In BOT or TOP mode the memory in the memory mapped 1/0 space
1/0 space (32K-36K) can only be used with an enhanced version of
the Processor Module.

o In BOT mode the module can overlay the 0-64K space occupied by TOP
Read only memory (ROM) or Random access memory (RA~) in which case
the BOT access is obtained by firmware iNhibiting the TOP memory
-this can only be done if the TOP memory is ~ddressable as all RAM or
all ROM.

o In TOP mode the module can occupy the same 0-64K space as TOP ROM,
if none is present a second Universal Memory Module addressed as ~OM
(but functioning as RAM) may also be used.
o In TOP mode Bank Switching is possible using an enhanced
version of the Processor Module and the 16K or 32K configurations of
Universal ~emory module. This permits up to 4 memory modules to
the overlay the 0-64K TOP memory space. Bank Switching can only be
used with an enhanced version of the Processor Module.
13255 13255-91171/03
Universal Memory Module REV DEC-26-18

1.1 OPERATION.
The Universal Memory Module is confiQured hy loading the Ram sockets
with the appropriate RAMS as follows:

I I
IMemory size I Left Bank Right 9ank
I I
I I
(Module 0) (Module 1)
I-----------~I-------~------~-,~-~~-~---~---~-~~-~

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