IMS 5000 Series User manual

5QQQ SERIES MICROCOMPUTERS
Table of Coptents
SECTION 1GENERAL DESCRIPTION AND SPECIFICATIONS
1.0 General Description ••••••
• • • • . • . • 1
SECTION 2 THEORY OF OPERATION
MEMORY, FLOPPY DRIVE AND WINCHESTER DRIVE TESTS
2.0
..
2.1
2.2
2.3
2.4
"-
.- .-----.
'----"
2.5
2.6
\
2.7
2.8
2.9
2.10
,"
'-/'
SECTION
3
3.0
3.1
3.2
SECTION
"
4.0
4.1
4.2
SYSTEM BLOCK DIAGRAM
S-100 MOTHERBOARD.
BOARD SH UNTING • • • ••
POWER SUPPLY ••••••
CENTRAL PROCESSOR BOARDS
2.4.1 -Model 451 Z80 Processor Board •••••
2.4.2 -Model 645 Z80 Processor Board
2.4.3 -Model 971 Z80 Processor Board
2.4.4 -Model 881 8088 Processor Board ••
MEMORY •••••••••••••••••
2.5.1 -Model 465 64K Dynamic RAM Board ••
2.5.2 -Model 961 256 K Dynamic RAM Board
I/O COr\TROLLERS •••..••••••
2.6.1 -Model 444 I/O Board ••••••
2.6.2 -Model 631 I/O Controller Board
2.6.3 -Model 480 4 Line Async. Comm. Controller
~ULTIPROCESSOR BOARDS •••••
2.7.1 -Model 740 I/O Processor Board ••
2.7.2 -Model 861 Multiprocessor Unit ••
FLOPPY DIS K CONTROLLER BOARDS.
2.8.1 -Model 431 Floppy Disk Controller Board
2.8.2 -Model 930 Floppy Disk Controller Board •••••
WINCHESTER DISK DRIVE SUBSYSTEM
~10DEL 662 VIDEO DISPLAY BOARD. • • •• • •••
DIS K DRIVES AND TAPE CARTRIDGE UNIT
TEAC FD-55 Floppy Disk Drive ••
Rodime-RO 200 Series Winchesters ••
Tape Cartridge System ••••••••
Memory Test Program •
Floppy Drive Test •••
Winchester Drive Test.
• 5
· 7
• 9
11
13
13
16
20
24
27
27
31
33
33
49
58
61
61
66
71
71
75
79
83
•90
• • 96
101
106
108
113
./
APPENDIX A FLOPPY DISK SUBSYSTEM SPECS
APPENDIX BIMS SYSTEM INFORMATION . ....
- 1 -
122
123

List of Figures and List of Tables
Figure 1-1
Figure 1-2
Figure 1-3
Figure 1-4
Figure 2-0
Figure 2-1
Figure 2-2
Figure 2-3
Figure 2-4
Figure 2- 5
Figure 2- 6
Figure 2-7
Figure 2- 8
Figure 2-9
Figure 2-10
Figure 2-11
Figure 2-12
Figure 2-13
Figure 2-14
Figure 2-15
Figure 2-16
Figure 2-17
Figure 2-18
Figure 2-19
Figure 2-20
Figure 2-21
Figure 2-22
Figure 2- 23
Figure 2-24
Figure 2-25
Figure 2-26
Figure 2-27
Figure 2-28
Figure 2-29
Figure 2-30
Figure 2-31
Figure 2-32
5000 SX Microcomputer System III Dimensions
5000 IS Microcomputer System III Dimensions.
Cartridge Tape Stand Alone Unit
5'A" Floppy Disk Drive •••••••••••
5000 IS Block Diagram
5000 SX Block Diagram
Twelve Slot Motherboard ••••••
DC Power Supply to Motherboard Connection.
Power Supply Specifications.
Power Supply ••.••...•..•
Model 451 CPU Board •••••••
Model 645 2- 80 Processor Board
Model 971 2-80 Processor Board
Model 881 8088 Processor Board.
465 64KB Memory Board ••••
Model 961 256K Memory Board .
Model
444 Board Block Diagram •
Computer to CRT Connection (444 Board).
Computer to Printer Connection ••••••
Computer to Centronics Printer Connection.
Model 444 I/O Controller Board ••.•••
631 Board to I/O Panel Connection ...•
Computer to CRT Connection (631 Board).
Computer to Serial Printer Connection
631 Parallel Port Pin Listing ••••••.•
Computer to NEC Printer Connection ...
Computer to Centronics Printer Connection.
Model 631 I/O Controller Board.
Model 480 I/O Controller Board.
Model 740 Multiprocessor Board ••
Model 861 Multiprocessor Board •••••••••
431 5" Floppy Disk Drive Controller Board
930 Floppy Disk Drive Controller Board ••••
Model 821 Winchester Controller Board
Winchester Interface Card . • •••
662 Board Switch Settings
662 Video Display Board ••
1
2
• • •• 3
• • 4
• 5
• 6
• • • • • 8
• 9
11
12
15
19
23
26
30
32
34
38
38
40
48
52
52
53
53
54
55
57
60
65
70
74
78
81
82
86
89
Figure 3-1
Figure 3-2
Figure 3- 3
Figure 3-4
Figure 3-5
Figure 3-6
Figure 3-7
Figure 3-8
Figure 3-9
Figure 3-10
TEAC 5~" Floppy Disk Drive •
TEAC Floppy Disk Drive Board
TEAC Floppy Disk Drive Cable Diagram
Rodime 5'A" Winchester Disk Drive ••••
Rodime Winchester Drive Cable Diagram ••
Stand Alone Tape Cartridge System •••
Switch Settings - Cartridge Tape Controller • • •• • •••
Tape Cartridge System Controller Board ••••••••
Record Format - Cartridge Tape Controller ••••
Tape Cartridge Data Cable Orientation •••
- 2 -
90
94
95
96
100
101
103
103
104
105 \

SECTION 1
General Description and S pecificatioDs
1.0 GENERAL DESCRIPTION
IIvlS International manufactures microcomputer systems in two basic
configurations: the 5000 and the 8000. They are differentiated by the size of
their flc::,py disk drives. All 5000 systems use 5 1/4" floppy disk drives, and
8000 system:. use 8" floppy disk drives. This manual examines the 5000 systems,
describing each system and each board in detail.
There are two different IMS 5000 systems, the 5000SX and the 5000IS
(Integrated System). Each uses the same boards, but they are in different
enclosures.
IMS 5000SX systems are table top systems featuring an enclosure design which
presents apleasing modern appearance while retaining rugged construction. The
5000 SX has provisions for three 5 1/4" drives, allowing any combination of
floppy drives and Winchesters with up to two Winchester drives. Nine unused
slots are available for system expansion. If the system has aWinches ter drive,
the Winchester controller board occupies one of these free slots.
PHYSICAL CHARACTERISTICS
~
7.25 in.
III
I"'
III
18.42 em III
'"
III
III
V
III
III
~
III
• J
III
II
III III
III
III
~
17.50 in.
::
44.45 em
~
Weight 69 Ibs. (31.30 kg)
Power Requirements 110V: 3Amps; 60
Hz or 220V: 1.5 Amps; 50 Hz
Figure 1-1
5000SX Microcomputer System and Dimensions
IMS International
5000 Series Microcomputers/7.01.83jPage 1

5000IS systems are integrated systems built into one compact unit. Each system
has a CRT and a detachable keyboard. There is room for three drives, usually
one Winchester and two half-width floppy disk drives. Five card slots are
available for future system expansion. The Winchester controller board, if used,
occupies one slot.
PHYSICAL CHARACTERISTICS •
I'~~
~
II
"
~:
"
'"
'"
"
"
14.25In.1
36.20 em
1 In.
2.53 em
\
-
15.5 in. rr---_~2~1~I~n.~---_
39.~ 53.34 em -I
Weight Keyboard 51bs (2 26kg) Console 40lbs (18 14 kg)
Power requirements 110V 1 5 Amps, 60 Hz or 220V 75 Amps 50 Hz
Figure 1-2
5000 IS Microcomputer System and Dimensions
All standard 8 bit 5000 systems contain the following features:
- 4 MHz Z80A Processor
- 64K Dynamic RAM with Parity
- Selectable Baud Rate up to 19.2 KB with full modem control
- Floppy Disk Drive Subsystem
-Real Time Calendar/Clock wi th Bat tery Backup
- S -100 Motherboard
- Two year IMS Warranty
IMS International
5000 Series Microcomputers/7.01.83/page 2

The differences between the 8 bit 5000lS and the 5000SX are listed below.
8- bit 5000 IS
8 slot motherboard
high resoution CRT
detached keyboard
8- blt 5000 SX
12 slot motherboard
T1.','O add-on options are available for all IMS systems; the Multi-Processor Unit
and the Cartridge Tape System.
The Multi-Processor Unit [MPUJ is a board which converts a single user system
into a multi-processing environment. The board contains a Z-80A
microprocessor, 64 Kbytes of dynamic Rk'vI with parity, four programmable
interval timers, a 2 Kbyte boot EPROM, and adual channel synchronous/asyn-
chronous communication controller with full modem support, auto answer and
auto dial. The MPU interfaces to the host CPU as an I/O device on the $-100
bus. Up to sixteen MPUs may be used in a single system. This board provides
each user the performance of a dedicated processor while allowing access to a
common data base.
The cartridge tape system serves as a start/stop backup memory for the high
performance Winchester, and can also be used as a memory subsystem for data
files and programs as would be required in a normal data processing environment.
The tape unit uses the standard ANSI cartridge (DC 300XL). The capacity of
each cartridge varies depending on the format selected. The tape cartridge unit
is mounted in a stand-alone enclosure.
Figure 1-3
Cartridge Tape Stand Alone Unit
IMS International
5000 Series Microcomputer s/7.0 1.8 3/Page 3

Another option on IMS systems is the selection of the floppy disk drive size.
There are two types of 5" floppy disk drives available from IMS, the double
density (48 tracks per inch) and the quad density (96 tracks per inch) half-width
drives.
Figure 1-4
5 ~ .. Floppy Disk Drive
IMS International
5000 Series Microcomputer s/7.0 1.83/page 4

SBCTION 2
TheelY pi Opc;ui ••
2.0 SYSTEM BLOCK DIAGRAM
The block diagrams for the 5000IS and the 5000SX are illustrated below. Each
IMS
system contains aCentral Processing Unit (CPU), Memory, Input and Output
capability and some type of memory storage (floppy disks or Winchester disks).
In addition, the system can be expanded by adding atape cartridge unit and/or
adding
multi-processing capabilties with the MPU board.
1-----
II
1 140 D 1::1-1 i
- - I
I/O
-----r
, I
I PRE1Tf.R ,
1 __
,-----
1I
ITERMINAL I
____ I
9I
-I
II'FlIN'l"F.1l
1- _
S-lOO 8US
,------- .------,
r-
o_o
_[-, ] - -I
I • I
i MPU {'!' B. U• I
~. ~ I ~O:JROL~R~
~ ~ -- --I
III , Tl'>.PE
I
MOOI!:M 'l'Ti:RlC T N'" LI I BACKUP I
I UNIT I
1 - I1 _
MPU
II
,_. _. --.-.
-1- -'
I·_
a-
----.
1-----
I
I PRINTER I
I
FLOPPY
CONTROLI.ER
PL,)PPY
OJdVE I!
'JIDb.J
fll::>PLA:i
BOARD
I "'''''
DIlIVE lil
r- .-
---r .
K=.YBOAkD
I
~_J __ ,
IWINCH1>S'I-ER 1
l CON71l0lLER 1
.--J--
-- - - 1
I 1
; ~~J;RH~1. ~
- - - - f
t W1 NCH!.",1'E3 I
I/)'11'h. 1
,-----
\-.
\
V
- - __ O"pt i.,nal
_._.-.- Multl-Uso!r
PilUC 2-0
,t.OIS Bleck Diqr ..
IMS International
5000 Series Microcomputers/7.01.83!page 5

'J
- - - - --I
I
: -: R" 'I,· : 11 .. -·
--,--- I ---J
L_-r-U~,I
1./11
, I
L.-; J
- -,
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rQII,i:R
j. l
r------j
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I
,
II ,J> ~ f
L. i{ III ".. ~ l
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,
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,- --- .. -
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• I,! ") I ], ,. I' P] I ( " j71 C ~ U\I
- -\ -. -_._---! - - ., - -
l-.. .• -'- ._- -, 1 r"'- - ---..J
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r-"-' --- -.. L -_. __ ._________ I - -- • 1---,
._ ~I~ -; - --- ---~-1_,---:--' "U 11_"_' -~-.I. _'1 .----.-=-~-_ ~
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! ~Ll))~' III rll,
II I I ~AL" v
t ,),1 I I • JI 'I 'r.t 'l II .:RM1 'I". I
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UNl'
____ Jj _ _ _ II - - - - - - - - - I
__ J
- - - -- (IJlllJrjl
Filure 2-1
5000 SX Block Diasram
J
IMS International
5000 Series Microcomputers/7.0 1.83/page 6

In the system block diagrams, each block connected to the S-100 bus represents
an IMS circuit board. The actual bus is contained in the motherboard.
Numbers and abbreviations are used to identify each board.
Board
Number
451
645
971
881
465
961
444
631
480
740
861
431
930
820
662
Abbreviation
CPU-A
CPU-B
ZPUjIO
8088ZPU
64DRAM
256DRAM
SPIO
SPIO-B
4SIO
MPU
MPU
FDC
FDC
HOC
VDB
Description
2-80 Processor Board
2-80 Processor Board
2-80 Processor Board
8088 Processor Board (16 bit)
Memory-64K
Memory-256K (for 16 bit systems)
Input/Output (2 serial, 3 8-bit parallel ports)
Input/Output (2 serial, 3 8-bit parallel ports)
Input/Output (4 serial ports)
2-80 Multiprocessor Board
2-80 Multiprocessor Board
5" Floppy Disk Drive Controller Board
5" or 8" Floppy Drive Controller Board
Winchester Disk Controller Board
Video Display Board (5000 IS only)
The last digit in the board number indicates the reV1S10n level. For example, a
444 I/O board is the same as a440 I/O board except for afew minor changes.
Different combinations of boards may be used to make up a system. The mos t
common are
listed below.
C£lL .lLQ. Memory
451 444 465
645
631
465
645 480 465
--971--
465
2.1 MOTHERBOARD
The motherboard is the board which holds all the other boards. It provides
power and communication signals. The protocol used for the signals is based on
the S-100/IEEE696 standard. IMS motherboards are not slot dependent; any
card can go into any slot. Generally, the boards are spread out to provide
ventilation between them. The only reason you might put a card in one place and
not another is the cabling considerations; other than that, you may move a card
anywhere you want. IMS 5000 systems have two sizes of motherboards; the
5000IS motherboard has 8 slots and the 5000 SX has 12.
IMS International
5000 Series Microcomputers/?O 1.8 3/page ?

Figure 2-2
Twelve Slot Motherboard
IMS International
5000 Series Microcomputers!7.01.83jPage 8
I
'-....."I

Pin
.sU-
IGRN, GND
2WHT, +16 V
3
BLK, -16 V
4GRN,
GND
5 NOT USED
6
RED,
+8 V
7GRN, GND
8
YEL, RESET
9
RED,
+8 V
,......
0
CD~~
0
0
@~@
0
~ rElCD
0
0
0
0
~
TBI to Motherboard
88GRN, GND
77GRN,
GND
66GRN, GND
55YEL
RESET
4·
4WHT, +16 V
33
BLK,
-16 V
22
RED,
+8 V
I1
RED,
+8 V
Figure 2-3
DC Power Supply to Motherboard Connection
2.2 BOARD SHUNTING
Each device in the microcomputer which needs to directly communicate with the
Central Processing Unit (CPU) is assigned a unique number which is called its I/O
address. The CPU can communicate exclusively with one device by using certain
instructions which broadcast a specific address over the bus. In IMS systems,
selection is done by comparison. Each device looks at the address on the bus and
compares it to its address; if they are the same, then that device is selected.
Each board (except the CPU board) has a set of shunts on it to specify its
address. Each shunt assigns a specific value to a certain address bit. If the
shunt is off, that address bit is assigned a 'I' value; if the shunt is on, the
address bit is equal to a '0'.
The MP U (740) board, for example, takes up four I/O address locations on the
bus. The boards normally occupy I/O addresses 40H to 5FH and EOH to FFH.
These locations enable us to include up to 16 boards in the system. Look at the
shunt positions JE and the value of each shunt:
Value with
Shunt OFF
Value with
J.E.
(and the rest ON)
Shunt ON
A7
0 0 80H OOH
A6 0 0
40H OOH
A5 0 0 20H OOH
A4 00 10H
OOH
A3 0 0 08H OOH
A2 00
04H OOH
The values are determined by the address bit they are being compared to. If we
look at JE as a binary number, we have:
A7, A6, A5, A4, A3, A2 -:> XXXX XXOOB-;> XXH
By setting the bits either high or low, we define our address. Al and AO are
both set to 0 since the board is addressed in units of 4H.
IMS
International
5000 Series Microcomputers/7.01.83/page 9

Examples:
Shunts (S=ON, U=OFF)
Binary
Value
Hex Address
A7, A6, A5, A4, A3, A2
--) XXXX
XXOO
--)
XXH
S,
U,
S,
S, S, S 0100 0000
40
S,
U,
S,
U, U,
U
0101
1100
5C
U,
U, U, S, S,
U 1110 0100
E4
U, U, U,
S,
U,
S 1111
1000
F8
ItO Addresses Used by IMS Boards
00- OFH
00
01-03
06,07
10H-1FH
20H-3FH
40H- 5 FH
60H-7FH
80- 8FH
90H-9FH
AOH-A7H
A8H-AFH
BOH-BFH
COH-CFH
DOH-DFH
EOH-FFH
Memory boards
First memory board
Additional memory boards
881 Processor board
44x I/O board
645 Processor board
971 Processor board
971 Processor board
631 I/O board
480 I/O board
First 8MPU boards (740 or 861)
645 Processor board
971 Processor board
881 Processor board
401 8" Floppy Disk Drive Controller
930 8" Floppy Disk Drive Controller
Currently unused
820- 55" Winchester Controller
820-8 8" Winchester Controller
Reserved for customer use
431 5" Floppy Disk Drive Controller
930 5" Floppy Disk Drive Controller
Tape Back-up Unit
Additional MPU boards (740 or 861)
or second 480 I/O board
'J
IMS International
5000 Series Microcomputers/7.01.83/Page 10

Interruot vectors
IMS peripherals have the capability of being interrupt driven. This means that
the controller will send a request for service directly to the processor instead of
waiting for a polling routine to service it. The processor supports 8 interrupt
levds, Vector Interrupts 0 to 7, with VIO having the highest priority. The
boards can be shunted to interrupt the processor at a certain level. The current
levels are listed below with their function and the boards that use them.
Vector Interrupt
VIO
vn·
VI2··
VB*
VB
VIS
VI6
VI7
Function
Reserved by CP/M
Relative
Time Clock (H ... and 6 ... S boards)
Time of Day CLock (6 S board)
Memory Parity Error (65 board)
Serial Communications (H"', "'80, 631 boards)
Hard Disk (820 board)
Floppy Disk HOI, HI, 930 boards)
Reserved for Customer Use
Reserved by CP/M
·not used by CP/M operating system.
··not used by TurboDOS
2.3 POWER SUPPLY
The IMS 5000lS and 5000SX use a switching power supply with the following
specifications:
Input: 100-130 V(60Hz) at 3 A maximum, or
200-260 V(50Hz) at 1.5 Amaximum.
Output voltage
+5 V
+12 V
+8.5 V
+16 V
-16 V
Note: Maximum load is 200 W total.
Output Current
3A
7A
lOA
"'A
0.5A
Filurc 2-4
P.wer Supply Specifications
IMS International
5000 Series Microcomputers/7.01.83;Page 11

J
'"
•
•
Filure 2-5
power Supply
)
IMS International
5000 Series Microcomputers/7.0 1.83/page 12

2.4 CENTRAL PROCESSOR BOARDS
2.4.1 MOPEL 451 - ZSO PROCESSOR BOARp
GENERAL
pESCRIPTION
The Model 451 Processor is the Central Processing Unit (CPU) of the IMS
International Series 5000 and SOOO Computer Systems. The Model 451 provides
contr 01 for the system. The 451 uses a Z-SO microprocessor for control. The
Z-SO has priority vectored interrupts and the ability to address 256 I/O
addresses, aa well as a central processing unit.
The Model 451 processor consists of a single printed circuit board that can
occupy any slot in the Series 5000 or SOOO computer systems. It interfaces with
the rest of the system through the address, data, and control lines of the S-100
bus system.
The 451 processor board consists of the following functional divisions:
•
Z-80 S-bit Microproces.or Device (CPU)
•
Priority Vectored Interrupt Circuitry
• S-100 Bus Interface
SPECIFICATIONS
•Word Size: Addres.
• Data
• Directly Addressable Memory:
•Clock Frequency:
•
Circuit Board Dimensiona:
• Power Requirements:
16
bits
8 bits
64Kbytes
4 MHz
5.25" :t 10"
+8V @700 ma
IMS International.
5000
Series Microcomputers/7.01.S3;1'age 13

CONFIGURING THE 451 Z-80 CPU BOARP
Legend
Wait State Select (Location IA)
The position of the shunt at JA indicates the number of states that the processor waits
after a memory read operation.
JA
10
20
30
Power On Address Select (Location IB)
No
shunts =No memory wait state (normal)
Shunt JA 1-2 = One wait state
Shunt JA 2-3 = Two wait states
JB
1 0--0 16
2 0--0 15
3 0--0 14
4 0--0 13
5 0--0 12
6 0--0 11
7 0--0 10
8 0--0 9
AI5
AH
A13
A12
All
A10
A9
A8
The shunt at JB indicates the address that the
processor jumps to when the system is powered up.
A shunt on a bit assigns a0 value to that bit;
a bit with no shunt is assigned a '1' value. So
with all the shunts on, the power-on address is
OOOOH. With all the shunts off, the power-on
address is FFOOH. This location is normally
etched for an address of 0000.
CPU Clock Select (Location IC)
JC
1 0--0 4
20 0 34MHz
2MHz
This shunt is etched to provide the Z- BOA
microprocessor with a4MHz clock.
Address Mirror Select (Location 10)
JO
When this location is shunted, the Address
Mirror duplicates the I/O address onto the
upper 8 address lines.
'J
MWRITE+ ENABLE (Location IE)
o0
1
JE
2
A
shunt on location JE allows the MWRITE +
signal (indicating awei te to memory) togo
out onto the bus. Normally, this location
is unshunted.
IMS International
5000 Series Microcomputers/7.01.83/page 14

Figure 2-6
Mode! 451 CP U Board
IMS InternatlOnal
5000 Sertes Mlcrocomputers/7 .01.8 3;Page 15

2.4.2 MOpEL 645 - 280 PROCESSOR BOARp
GENERAL PESCRIPTION
The Modd 645 Processor Board is the Central Processing Unit (CPU) of the IMS
INTERNATIONAL Series 5000 and 8000 Computer Systems. The Modd 645
provides control for the system.
The 645 uses a 2-80 microprocessor for control of the system. The 2-80,
besides being the central processing unit, has priority vectored interrupts and the
abili ty to address 256 I/O por ts.
A chronograph function is provided by the 58167 real-time clock. The circuit
includes addressable counters for tenths of seconds through months and a write
only register f or leap year calculation. A rdative time clock function is also
available
using an 8253 programmable interval timer.
The Modd 645 processor consists of a single Printed Circuit Board. It interfaces
wi th the r est of the system through the address, data, and control lines of the
S-100 Bus System.
The 645 Processor Board consists of the following function divisions:
• 2-80 8-bit Microprocessor (CPU)
•
Priority Vectored Interrupt Circuitry
• Programmable Interval Timer
Real-Time Clock
2048 by 8-bit EPROM
SPECIF ICATIONS
Word Size: Address
Data
• On-Board ROM:
•
Directly Addressable Memory:
• Clock Frequency:
Circui t Board Dimensions:
• Power Requirements:
IMS International
5000 Series Microcomputer s/7.01.83/page16
16 bi ts
8 bits
2 Kbytes standard. (May be
shunt sdected to use
4 Kbyte EPROMS)
64Kbytes
4MHz
5.25"x 10"
+8V @ 900 ma
\

ItO DEy ICE ADDRESSES USED BY THE 645 CPU BOARD
14H-17H
14H
15H
16H
17H
18H
bit 0
bit 1
19H
IBH
bit
0
60H-7FH
60H
61H
62H
63H
64H
65H
66H
67H
68H
69H
6AH
6BH
6CH
6DH
6EH
6FH
70H
71H
I72H
'-
73H
74H
75H
76H
7FH
8253 Programmable Interval Timer
8253A Counter #0 R/W
8253A Counter #1 RjW
8253A Counter #2 R/W
8253A Write Mode word
2716 or 2732 EPROM Enable and 8253 RTC Interrupt Mask
2716 EPROM
Disabled when bit 0=1
8253A RTC
Interrupt enabled when bit 1=1.
NOTE: While EPROM
is enabled, the first 4 Kbytes of memory
are occupied whether the actual EPROM is 2 or 4 Kbytes.
8253A RTC P/F Reset
58167 CLK Interrupt Mask
58167 CL K
Interrupt enabled when bit 0=1.
58167 Clock Internal Register Select
R/W Counter - Thousandths of Seconds
RjW Counter - Hundredths and tenths of seconds
R/W Counter -Seconds
RjW Counter - Minutes
R/W Counter - HOUlS
RjW Counter -0 ay of the Week
R/W Counter - Day of the Month
RjW Counter - Months
R/W Latches - Thousandths of Seconds
RjW Latches - Hundredths and Tenths of Seconds
RjW Latches -Seconds
RjW Latches - Minutes
RjW Latches - HOUlS
RjW Latches - Day of the Week
RjW Latches - Day of the Month
RjW Latches - Months
RIO Interrupt Status Regis ter
WIO Interrupt Control Register
WIO Counter Reset
WIO Latch Reset
RIO Status Bit
WIO "GO" Command
WIO Standby Interrupt
Test Mode
IMS
International
5000 Series Microcomputers/7.01.83jPage 17

CONFIGURING THE 645 CPU BOARD
Wait
State Selection
The "WAIT" shunt indicates the number of wait states the CPU Walts after a
memory access. It is presently etched for no wait states.
ROM Location Selection
The "ROM" shunt is etched to indicate that the Initial Program Loader (IPL) boot
ROM is located on the 645 board. If this connection is cut, the system assumes
that the IPL is on the I/O board.
EPROM Type Selection
The" 16/32" shunt indicates the type of EPROM used. The "16" side is etched
to indicate the use of a 2716 2 Kbyte EPROM. If this connection was cut and
the "32" side shunted, it indicates that a 2732 4Kbyte EPROM is being used.
Interrupt Level Selection
The "VIl, VI7" shunt indicates the interrupt level for the real-time clock. This
is normally etched for level VI!.
IMS International
5000 Series Microcomputer s/7.0 1.8 3/page 18
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