Industrial Micro Systems 464 - Parity and Mode Settings; Parity Interrupt Options (JACK JG); Normal;Bank Mode Selection (JACK JE)

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PARITY

INTERRUPT

OACK

JG)

Jack

JG

allows

selection

of

eight

different

responses

to

a

parity

error.

The

selections

are:

SHUNT

POSITION

VIl

VI2

VB

VI4

VI5

INT

NMI

RDY

S100 BUS PIN NO.

05

06

07

08

09

73

12

72

INTERRUPT

SELECTEp

VECTORED INTERRUPT 1

VECTORED INTERRUPT 2

VECTORED INTERRUPT 3

VECTORED INTERRUPT 4

VECTORED INTERRUPT 5

PINT Line

Non-maskable

INT

(Z-80

only)

PRDY Line (Parity

Error

Stops

CPU)

When

using

the

parity

error

circuit,

the

user

must

initially

write

into

all memory

locations

after

power

is

initially

applied

to

condition

all

the

parity

bits.

After

the

memory

is

initialized,

the

parity

error

circuit

must

be

reset.

The

parity

error

circuit

is

reset

by any

output

to

the

I/O

port

on

the

memory

board.

The

Power

On

Clear

signal

(POC

Pin

99

on

S100

bus)

also

resets

the

parity

error

circuit.

The

state

of

the

parity

circuit

may be sensed

by

reading

bit

"0"

of

the

I/O

port

on

the

memory

board.

A

"1"

bit

indicates

a

parity

error

has

occurred.

NORMAL/BANK

MODE

OACK

JE)

The

"bank"

mode

shunt

should

be

installed

only

if

the

board

is

to

be

used

in

the

Bank

Switched

mode.

In

this

mode

the

board

will

respond

to

all addresses

from

0000

to

FFFF

hex.

For

memories

that

are

to

be

bank selected,

this

shunt

should

be

installed.

NORMAL MODE

In

the

normal mode,

shunt

JE removed,

the

four

16K memory banks occupy

the

entire

16

bit

address

space

0000

thru

FFFF

hex.

In

this

mode, each 16K

bank

may be

controlled

individually

by an

output

to

the

board's

I/O

Port.

A

"one"

bit

disables

the

associated

bank.

Control

is

on a

bit

basis,

thus:

OUTPUT

DATA

CONTROLLED

MEMORY

BANK

(HEX)

BANK

MOPE

BIT

0

BIT

1

BIT 2

BIT

3

0000-3FFF

4000-7FFF

8000-BFFF

COOO-FFFF

(omitted

in

32K version)

(omitted

in

32K & 48K

version)

In

the

Bank

Mode

(Shunt

JE installed)

the

board

responds ro a

combmation

of

bits

and

bank

selection

is

not

done

on

a

bit

basis.

Codes

are

provided

for

a

variety

of

configurations

defined

in

the

following

table.

Initially,

the

board

is

deselected

by

the

Power

On

Clear signal.

The

464

memory

can

be

used

in

a

16K,

32K or 48K

bank

selection

scheme. When

the

464

board

is ordered

in

a 48K

configuration,

Bank 3

is

omitted.

When

ordered

in

a 32 K

configuration,

Banks 2

and

3

are

omitted.

INDUSTRIAL

MICRO

SYSTEMS,

INC.

000464

REV

A

8/12/80

Page

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