Zenith Data Systems Z-100 Series User manual

7'11-". data
jfi systems
THE QUALITY GOES IN BEFORE THE NAME GOES ON
PERSONAL COMP(JTER SYSTEMS
Z-329
MONOCHROME
VIDEO CARD
INSTALLATION MANUAL

595-3354
Monochrome Video Card
Z-100 PC Series Computers
and IBM PC Computers
Installation Manual
Z-329
~""N data
systems

LIMITED RIGHTS LEGEND
Contractor is Zenith Data Systems Corporation of St. Joseph, Michigan 49085. The entire
document is subject to Limited Rights data provisions.
Copyright 1985 by Zenith Data Systems Corporation, all rights reserved.
Printed
in the United States of America.
Zenith Data Systems Corporation
St. Joseph, Michigan 49085

Figures
Tables
Contents
v
v
Chapter 1Introduction and Specifications
Introduction 1.1
Specifications 1.2
Chapter 2Installation, Configuration, and Initial Tests
Z-100 PC Series Computers 2.1
Z-150 Disassembly 2.1
Z-160 Disassembly 2.2
Configuration 2.5
Simplified Configuration (Default) 2.5
Detailed Configuration 2.6
CPU Card Configuration 2.7
Installation of Video Card 2.9
Z-160 Reassembly 2.10
Z-150 Reassembly 2.12
Checkout for Z-100
PC Series Computers 2.12
IBM PC Computer 2.14
Disassembly 2.14
Configuration 2.15
Simplified Configuration 2.15
Detailed Configuration 2.16
System Board Switch Settings 2.16
Installation of Video Card 2.18
Reassembly 2.19
Checkout 2.19
Chapter 3General Theory of Operation
Memory Organization 3.1
RAM 3.1
Character ROM 3.2
Character Generation 3.3
CRTC Addressing 3.4
Data Management 3.4
CRTC 3.4
CPU Memory Access 3.5
CRTC Registers 3.5

Page iv
Contents
Chapter 4Software Considerations
The Control Register 4.1
Writing Data to the Z-329 Card 4.2
Attribute Codes 4.4
Cursor Control 4.5
Blanking/Clearing the Display 4.6
Scrolling the Display 4.6
Paging the Display 4.7
Character Font 4.8
Status Register 4.9
Quick Reference Charts 4.9
Chapter 5Card/Circuit Description
Block Diagram 5.1
Circuit Description 5.3
Function and Timing Decoding 5.3
Data Bus Communication 5.4
Converting Character Data to Pixel Drive Signals 5.6
Attribute Data Conversion 5.8
Sync 5.8
6845 CRTC 5.8
Shift/Storage Register 5.12
Schematic Fold-in

Page V
Contents
Figures
2.1 Z-150 Disassembly 2.1
2.2 Z-160 Chassis 2.2
2.3 Z-160 Disassembly 2.4
2.4 Z-329 Card Component Layout 2.5
2.5 Z-150 Chassis 2.7
2.6 CPU Card Switch Setting 2.8
2.7 Blank Bracket 2.9
2.8 Z-160 Chassis 2.10
2.9 Z-160 Reassembly 2.11
2.10 Z-150 Reassembly 2.13
2.11 IBM PC Cover Removal 2.14
2.12 Z-329 Component Layout 2.15
2.13 IBM System Board Component Layout 2.17
2.14 IBM PC Cabinet 2.18
2.15 Blank Bracket 2.18
2.16 IBM
PC Cover Installation 2.19
3.1 Character Generation 3.3
3.2 Interlace/Non-Interlace Modes 3.8
5.1 Z-329 Card Block Diagram 5.1
5.2 6845 Pinout 5.9
Tables
3.1 Character/Attribute Addressing 3.2
3.2 Interlace Mode Register 3.9
3.3 Character Skew (Delay) Control 3.9
3.4 Cursor Skew (Delay) Control 3.9
3.5 Cursor Start Register 3.10
4.1 Video Control Register Functions 4.1
4.2 Character/Attribute Addressing 4.3
4.3 Attribute Codes 4.4
4.4 Character Font 4.8
4.5 Register Addresses 4.9
4.6 CRTC Registers and Default Values 4.10
5.1 Transceiver States 5.5
5.2 Decoder U28 Truth Table 5.6
5.3 6845 Pin Functions 5.10

Chapter 1
Introduction and Specifications
Introduction
The Z-329 Monochrome Video Card interfaces between the computer sys-
tem and the video monitor. The Z-329 Card provides avideo output com-
patible with the output from an IBM monochrome video card.
The Z-329 Card provides one page of memory stored in static RAM. Two
pages (interlaced) or four pages (non-interlaced) of data can
be stored
if the optional 8K x 8 RAMs are installed. The characters are stored
in ASCII code. An 8-bit attribute byte, also stored in RAM, is associated
with each ASCII character. The characters are converted into pixel drive
data by acharacter ROM located on the card. The ROM converts the
ASCII code into the correct pixel drive data to create the characters on
the monitor.
Up to 80 characters can be displayed in each of the 25 lines of the display.
The attributes allow any character to be blanked (not displayed), blink,
underlined, intensified, ordisplayed in reverse video (black on white).
The addresses of the control registers and of the memory on this card
are different than those of the other video cards available with the
Z-100@)PC. This means that the standard video card (red-green-blue dis-
play, low/high-resolution graphics) and the Z-319 Bit-Mapped Video
Graphics Card (Z-100 compatible, high-resolution graphics) can
be left
in the computer.
@Z-100 is atrademark of Zenith Data Systems Corporation.

Page 1.2
Introduction and Specifications
Specifications
Display Format:
Character Type:
Character Set:
Attributes:
Pages:
Outputs:
25 rows of 80 characters (50 rows of 80 charac-
ters can be displayed when the optional 8K x
8RAMs are installed and the interlace mode
is
used)
9 x 14dot matrix
"Hard", redefinable by ROM
(1 character font is
supported, asecond font may be present on the
standard ROM, and
up to 4fonts may be custom
programmed into the optional 128K ROM)
Non-display, blink, underline, intensify, and re-
verse video
1(up to 4pages non-interlaced or 2pages inter-
laced are available with optional RAM chips)
Video, intensity, horizontal sync, and vertical sync
Z-329 Output Connector
(REAR VIEW)
PIN #
1
2
3-5
6
7
8
9
DESCRIPTION
CHASSIS GROUND
SIGNAL GROUND
NO CONNECTION
INTENSITY
VIDEO
HORIZONTAL SYNC
VERTICAL SYNC

Chapter 2
Installation, Configuration,
and Initial Tests
Z-100 PC Series Computers
Z-150 Disassembly
If your computer is aZ-150 Desktop Computer, use this disassembly pro-
cedure.
WARNING: When the line cord is connected to an AC outlet, hazardous
voltages can
be present inside your computer.
•Switch offthe computer and unplug the line cord from the
AC outlet.
•Refer
to Figure 2.1. Remove and save the seven screws (labeled 6-32
x3/8) that secure the top cover to the computer.
•Carefully lift the top cover slightly to the rear and then lift
it straight
up and set it aside.
Disassembly
is now complete. Proceed to Configuration.
I COVER I
6-32x3/8"
Figure 2.1. Z-150 Disassembly

Page 2.2
Installation, Configuration, and Initial Tests
Z-160 Disassembly
If your computer is aZ-160 Portable Computer, use the following disas-
sembly procedure.
WARNING: When the line cord is connected to an AC outlet, hazardous
voltages can be present inside your computer.
Be especially cautious of
the area marked HAZARDOUS VOLTAGE in Figure 2.2.
BLANK
BRACKETS
SCREW
SUPPORT BRACKET
4-PIN CONNECTOR In- __ II IL
.. _-------------
CAUTION
HAZARDOUS
VOLTAGE
AREA
-----------
POWER SUPPLY
BACKPLANE
BOARD
VIDEO DRIVER
BOARD
VIDEO DEFLECTION
BOARD
DISK CONTROLLER CARD
VIDEO LOGIC CARD
Figure2.2. Z-160 Chassis

Page 2.3
Installation, Configuration, and Initial Tests
•Unplug the line cord from the AC outlet.
•Refer to Figure 2.3. Slide the drive assembly latches (shown
in inset)
toward the front of the computer and hold them
in that position while
lifting the disk drive assembly. Lift the drive assembly until the latch
arms are free ofthe slot
in the cabinet top.
•Lift the disk drive assembly until
it is nearly vertical and hold it or
prop
it in this position.
•Disconnect the ground strap (shown
in inset) from the computer chas-
sis and disconnect the drive ribbon cable and the power supply
cable(s).
•
Push the connectors, which were disconnected in the previous step,
through the opening
in the cabinettop.
•Lift the disk drive assembly until
it is vertical and then lift it off the
computer. Carefully place the diskdrive assembly aside.
•Remove and save the four screws (labeled 6-32 x3/8) which secure
the cabinet top to the computer.
•Slightly lift the rear of the cabinet top. Move the cabinet top rearward
until the front lip of the cabinet top
is no longer under the computer
front panel.
•Lift the cabinet top straight offthe computer
and set it aside.
•Locate the card support bracket (Figure 2.2) which secures the printed
circuit cards. Remove the card support bracket screw and the bracket
and set them both aside.
Disassembly of the Z-160
is now complete. Proceed to the Installation
of Video Card section.

Page 2.4
Installation, Configuration, and Initial Tests
Figure2.3. Z-160 Disassembly

Page 2.5
Installation, Configuration, and Initial Tests
Configuration
Simplified Configuration (Default)
NOTE: The card should come from the factory in this configuration.
Position the Z-329 Card as shown
in Figure 2.4. All jumpers should be
installed as shown in the figure. These jumperpositions are detailed below:
DThe two RAM size jumpers (J6 and J7) should be in the 2K position.
DThe video control jumpers (J2, J3, and J4) all should be in the positive
(POS) position.
DVertical syncjumper J1 should be in the negative (NEG) position.
DROM size jumper J5 should be in the 64K, 128Kposition.
Figure2.4. Z-329 Card Component Layout

Page 2.6
Installation, Configuration, and Initial Tests
Detailed Configuration
•Jumpers J6 and J7 are used to "size" the RAM chips on the Z-329
Card. The card is shipped with 2K x 8 static
RAM ICs installed. It
is possible to install 8K x 8 static RAM ICs. When this is done, these
jumpers must be moved to the 8K position.
•Jumper J5 is used to "size" the
ROM chips on the Z-329 Card. The
card is shipped with a8K x 8
ROM IC installed. It is possible to
install 4K x 8 or 16K x 8 ROM ICs. When this is done, J5 must
be moved to the position corresponding to the size of the ROM in-
stalled.
•Jumper J3 controls the polarity of the video data. When this jumper
is in the pas position, +5VDC is used to light apixel and ground
drives dark pixels. When this jumper
is in the NEG position, ground
is supplied to the monitor for all lighted pixels and +5VDC is used
for dark pixels.
•Jumper J2 controls the polarity of the intensity signal.
In the pas
position, an intensified character is signified by alogic high and a
standard display by aground.
In the NEG position, logic high is used
for the standard display and intensified characters are created by a
ground.
•Jumper J4 controls the polarity of the horizontal sync.
In the pas
position the sync pulses are positive-going. In the NEG position the
pulses are negative-going.
•Jumper
J1 controls the polarity of the vertical sync. In the pas position
the sync pulses are positive-going.
In the NEG position the pulses
are negative-going.

Page 2.7
Installation, Configuration, and Initial Tests
CPU Card Configuration
The configuration switches on the CPU card must be properly set for
the computer to automatically select video from the Z-329 Card when
it is switched on. The Z-329 Card can be selected from the monitor mode
or by software regardless of the switch setting. The following instructions
describe resetting these switches.
•Locate the CPU card (Figure 2.2 or Figure 2.5).
•Unplug the keyboard from the back ofthe computer.
•Unplug the 4-pin connector from the front of the CPU card (Figure
2.2 or Figure 2.5).
•Remove and save the screw from the CPU mounting bracket (Figure
2.2 or Figure 2.5).
•Gently pull upward on the CPU card to remove itfrom the computer.
DISK CONTROLLER CARD
====~*_ 4-PIN CONNECTOR
WINCHESTER
'''"''~- CONTROLLER CARD
I
I
~ KEYBOARD CONNECTOR
Figure2.5. Z-150 Chassis

Page 2.8
Installation, Configuration, and Initial Tests
•Locate SW1 (Figure 2.6) and set switch sections 4and 5to the OFF
(left) position.
Reinstall the card as follows:
•Align the front edge ofthe card
in the card guide.
•Insertthe card into the card guide.
•Line up the card edge-connector with the backplane connector.
•Gently, but firmly push the card into the backplane connector until
the card is fully inserted.
•Secure the card to the back of the computer with the screw removed
from the blank bracket.
CAUTION: The computer can be damaged if ametal object is dropped
into the computer and not removed before power is switched on. Recover
all objects before applying power.
•Connect the 4-pin connector to the front of the CPU card.
•Connect the keyboard to the CPU card through the back of the com-
puter.
o
•
"~ •.
7~
CPU CARD I
Figure 2.6. CPU Card Switch Setting
m
•••••••••

Page 2.9
Installation, Configuration, and Initial Tests
Installation of Video Card
•The new Z-329 Video Card may be installed in any empty backplane
expansion slot. Select any available slot (Figure 2.2 or 2.5).
•Remove and save the blank bracket screw (Figure 2.7) from the blank
bracket and then remove and discard the blank bracket.
Install the card as follows:
•Align the front edge ofthe card
in the card guide.
•Insert the card into the card guide.
•Line up the card edge-connectorwith the backplane connector.
•Gently, but firmly push the card into the backplane connector until
the card is fully inserted.
•Secure the card to the back of the computer with the screw removed
from the blank bracket.
You are now ready to reassemble your computer. Proceed to the reassem-
bly instructions.
BLANK
BRACKET
~ .. ~ .... \.
\ ..
\ "'.
\'. . ..•.•....
.~.
,
Figure 2.7. Blank Bracket

Page 2.10
Installation, Configuration, and Initial Tests
Z-160 Reassembly
Use the following procedure to reassemble your Z-160 Portable Computer.
•Place the card support bracket (Figure 2.8)
in position along the top
of the cards. Secure the card support bracket to the computer frame
with the card support bracket screw which was removed earlier.
•Refer to Figure 2.9. Push the drive ribbon cable and the power supply
cable(s) through the cutout
in the cabinet top.
•Slide the front
of the cabinet top under the lip in the front panel and
then lower the top cover onto the computer.
•Reinstall the four screws (labeled 6-32 x3/8) which secure the cabinet
top to the computer.
•Lift the disk drive assembly into position and engage the hinge pieces
into the slots
in the top cover.
SCREW
SUPPORT BRACKET
4-PIN CONNECTOR
POWER SUPPL Y
,I
, ,
~~--1l' U-----trl!iil BA C KPL ANE
_ BOARD
VIDEO DRIVER
BOARD
VIDEO DEFLECTION
BOARD
DISK CONTROLLER CARD
VIDEO LOGIC CARD
Figure 2.8. Z-160 Chassis