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HP 13255
EXTENDED DISPLAY MEMORY ACCESS MODULE
Manual Part No. 13255-91124
PRINTED
AUG-OI-76
DATA TERMINAL
TECHNICAL INFORMATION
._._----
HEWLETTi:I PACKARD
Printed in U.S.A.
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Extended OMA Module Rev AUG-01-76
1.0 INTRODUCTION.
The Extended Display Memory Access (OMA) fetches characters and im~
bedded control c~des to be displayed on the screen. The Extended DMA
fills a line buffer with 80 displayable characters, then trades the
buffer to the Display Control and Display Timing peA's for actual dot
generation. The Extended DMA has a bus controller which enables it to
get characters from memory without processor intervention.
2.0 OPERATING PARAMETERS.
A summary of operating parameters for the Extended DMA Module is
contained in tables 1.0 through 6.0.
Table 1.0 Physical Parameters
==~=================================================== ==========================
Size (L x W x 0) I Weight
Nomenclature ~/-O.I00 Inches I (Pounds)
=============1==============================1=======================1=========
02640-60124 Extended DMA PCA 12.5 x 4.0 x 0.5 0.35
==============================================================================
Number of Backplane Slots Required: 1
========s=======================================================================
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Table 2.0 Reliability and Environmental Information
::===:==========================================================================
Environmental: ( X ) HP Class B ( ) Other:
Restrictions: Type tested at product level
=::==================================================::=:::=::==:::==:::===:=:
Failure Rate: 1.099 (percent per 1000 hours)
============~===================================================================
Table 3.0 Power Supply and Clock Requirements - Measured
(At +1-5' Unless otherwise SpecIfied)
=====:=========================================2=================================
+5 Volt Supply +12 Volt Supply -12 Volt SupplY +42 Volt Supply
, 640 mA rnA ~ 30 mA mA
NOT APPLICABLE NOT APPLICABLE
====================================== =======================================
115 volts ac 220 vOlts ac
A A
NOT APPLICABLE NOT APPLICABLE
=====z=========z==============================================================
CloCk Frequency: 4.915 MHz
====s:=======================_===================================================
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Table 4.0 Jumper Definitlon~
=============z==================================================================
Function
peA
Designation I---------------------------~~------------------------ --------1
In Out
I================I ==============================I=z=== =========================1
MSBI ADDF14, ADDR15 = 1,1 ADDR14, ADDR15 = 0,0
============.=========================================:==========================
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5.0 Connector Information
================================================================================
connector Signal Signal
and Pin NO. Name Description
====.========== ================ ==============================================
PI, Pin 1 +SV +5 Volt Power Supply
-2 GNO Ground Common Return (Power and Signal)
-3 SIS eLK 4.915 MHz System ClOCK
-4 -l2V -12 Volt Power Supply
-s ADORO Negative True, Address Bit 0
-6 ADDRI Negative True, Address Bit 1