Ohio Scientific Superboard II User manual

SUPERBOARDrr KIT
ASSEMBLY MANUAL
MIA-COM OSI
April, 1982

NOTE
The Superboard II is a sophistocated microcomputer, a very delicate
piece of electonic hardware. Assembly of this kit should only be
attempted by individuals experienced with electronic assembly and
test techniques.
Ohi 0 Sci entifi c
1333 S. Chillicothe Rd.
Aurora, Ohio 44202
Printed in the United States of America
Copyright 1982
Ohio Scientific
All Rights Reserved

TABLE OF CONTENTS
Overview
Warranty
Assembly
Introduction ..................................
Stage I Socket
and Low
Profile
Parts
Insta 11 ati on
Part 1 Steps 1-7 .........................
Part 2 Steps 8-11 ........................
Part 3 Steps 12-16 ·
......................
Part 4 Steps 17-24 •
•••••••••• • e . ••••••••• •
Part 5 Steps 25-31 ·......................
Stage II
Keyboard
Assembly
Part 1 Steps 32-36 ·......................
Stage III
Assembly
and
Testing
of Video
Ci rcuit
1 - 2
3
4 -7
8
-21
22-26
27-35
36-45
46-55
56-65
Part 1 Steps 37-41
....................... 66-78
Stage
IV Final Assembly and Test
Part 1 Steps 42-44
....................... 79-84
Part 2 Step
45
Step 46
Part 3
Appendices 1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
II.
12.
Superboard
II and C1P Documentation .... .
Parts
Bags -- Cross Reference ......... .
Trouble Shooting Chart
................. .
External Storage of
Programs ........... .
Vi deo Memory Maps ...................... .
Character Graphics ..................... .
BASIC-;n-ROM Error Codes .............. . .
Memory Map ............................ .
Pi nouts ................................ .
Legend Superboard II Schematic ........ .
Superboard
II Schematic .......... . ..... .
Parts
List and Description ............ .
85-86
87-90
91
92-100
101
102-103
104
105-111
112
113
114
115
116-121
122-123

OVERVIEW
Your OSI Superboard, when completed, is a powerful,
versatile 8K computer. The video display is an easy to read
24 character by 24 line format which features both upper and
lower case letters directly from the keyboard. In addition,
there are numerous non alpha-numeric graphics characters
which, together with the standard text characters, make up a
set of 255 characters. The Superboard connects directly to
a video monitor (or standard TV set by way of an RF
modulator) and to a cassette player. With a substitution of
connections at the rear edge Molex socket, the Superboard
can be used with a serial printer or a modem as well as with
the cassette player. The addition of a 610 I/O board will
give you memory expansion ' capabiiity up to 32K arid the
possibility of adding one or two minifloppy disk drives.
Before beginning the assembly, you should read through
this entire assembly manual in order to get in mind the
total picture of the project. Do not rush the the assembly.
Care and frequent checking of your work will payoff in the
long run. Assembly will take about 20-25 hours.
1

MATERIAL REQUIREMENTS
For Assembly
For Use
Good quality soldering iron
(25 watt with 1/16" plated tip)
Rosin core solder
(supplied with
kit)
Needle nose pliers
Side cutters (diagonal cutters)
Screwdriver
Solder Sucker (or solder braid)
Csotch tape
AC/DC VOM multimeter
Logic probe (useful for testing but not required)
5 Volt
DC, 3 Amp power supply
regulation -
better than 4%
ripple - less than 4%
The addition of a 610 will require an additional
power supply - total 6 amps.
Video monitor (or B&W TV with RF modulator*)
Portable cassette recorder (used on AC)
Small speaker (useful with DAC but not required)
*ATV Research Microverter recommended
2

051 LIMITED 30-DAY WARRANTY
The OSI warranty is a Limited Warranty as defined by the u.s.
Consumer Product Warranty and Federal Trade Commission Act.
This warranty entitles you to certain legal rights although
the details vary from state to state.
Covered Parts: OSI will replace factory defective parts for
a period of 30 days from date of purchase.
Replacement parts are warranted to be free
from defects for the balance of the original
warranty period. Replacement parts are
obtained by calling [phone] and asking
for the Superboard Kit Department.
(8-5 EST Monday-Friday)
Not Covered: The warranty specifically does not cover
assembly errors, damage caused by negligence
or abuse. Use of unauthorized parts, modifi-
cations or corrosive solder voids this warranty
completely. Warranty does not cover inconven-
iences, loss of use, assembly or set up time,
unauthorized service.
NOTE: OSI cannot accept collect calls.
Customer Information: OSI will not service kits which have
not been completed. Malfunctions involving
non-OSI peripherals (monitors, tape recorders,
etc.) are the customer's responsibility.
Returns:
Repair Fee:
Software:
The customer must obtain a Return Authorization
(RA) number before returning any item to 051.
Please call [phone] and ask for Super-
board Kit Department. Shipping damage is not
covered by this warranty.
A standard repair fee will be charged on all
Superboard Kits returned to OSlo The standard
fee is $50. OSI reserves the right to repair or
Replace at our discretion. The customer will pay the
shipping to
OSI and OS! will pay the return shipping
Software
is specifically not warranted.
3

ASSEMBLY INTRODUCTION
Befare yau start to. maunt the parts an the circuit
- baard, it will be helpful far yau to. became familiar
with what functians the variaus sectians af the baard
will perfarm. Pasitian the baard in frant af yau with
the "Ohio. Scientific Madel 600 CPU" label side up and
with the natch in the upper right carner. In this
pasitian, the lang edge af the baard will extend away
fram yau. This is the arientatian which is shawn in
Figure 1-1. Far the purpase af insuring that the baard
is ariented carrectly far each step af assembly, the
edge farthest fram yau has been labeled N far Narth.
As yau can see fram Figure 1-1, the keybaard sectian af
the ciruit baard is clasest to. yau while the
Input/Output (I/O) sectian is at the upper left. The
RAM chips will be lacated at the upper right ' with the
RAM chip select circuit campanents just belaw. Just
abave the keybaard an the right is the circuitry far
decading the signals fram the keybaard. To. the left
abave the keybaard sectian are the ROM chips which
cantain the pragrams necessary far yaur camputer to.
functian as it daes. Abave the ROM chips is the
circuitry far selecting ROM addresses. Finally, the
heart and saul af yaur Superbaard, the 6502
micrapracessar, is lacated in the center abave the
keyboard.
Figure 1-2 is a detailed diagram af the superbaard
campanent layout. The rectangles in the tap twa-thirds
af the diagram are the individual IC chips. The cades
an these chips (U8, U9, UIO, ... etc.) will be used in
the manual to. refer to. particular chips. These same
cades are used in the camplete Superbaard schematics*
faund at the end af this manual. Yau will nate that,
with same exceptians, the numbers start law at the
sauth-east partian af the baard and increase as yau
mave west and narth. The pasitians af the resistars,
capacitars, and diades are marked with a shape which
carrespands raughly to. the physical farm af the circuit
element. The letters R, C, and D specify resistar,
capacitar, ar diade. The numbering system is the same
as that far the , IC chips.
As yau camplete each step, check aff the
apprapriate bax in the sequence af steps.
**
* See Appendix
**Important points and warnings will be outlined with a box for emphasis.
4

Your
Superboard II Kit Contains
Bag A Capacitors
Bag
B Chips, Diodes and Transistors
Bag C Resistors
and Pots
Bag D Misc. Hardware, Sockets and Solder
Bag
E
Keyboard
Parts
Bag F Chips
Bag
G Miscellaneous
Bag H Chips
Superboard II Bare circuit board
Superboard II Kit
Assembly Manual
Cassette tapes (two, one test and one blank)
5
56 Pieces
31
58
108
110
27
3
37
430 Total

I/O
Section
ROM Select
ROM
N
o
LO
\0
Keyboard Area
Figure I-I
6
RAM
RAM Select
Keyboard
Decoding

SUPERBOARD KIT BOARD LAYOUT DIAGRAM
Figure 1-2
7