Mostek z80 - History Module Jumper Options

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2-4

2.5

JUMPER

OPTIONS,

HISTORY

MODULE

This

section

describes

the

installation

of

the

jumpers

which

specify

user

selectable

options.

Jumpers

Which

must

be

installed

are

specified

with

a

"_"

Jumpers

which

must

not

be

installed

are

specified

with

a

II

".

Jumpers

which

are

described

in

other

paragraphs

are

specified

wi

th

a

".".

U68

selects

the

board

which

generates

the

execution

timer

signal,

the

block

of

system

ports

used

by

each

board

in

mul

tiboard

systems,

and

if

the

OEM-80

CTC

is

used

to

extend

the

EVENT

counter

to

sixteen

bits.

1.

Pins

1

and

16

of

U68

select

the

board

which

generates

the

execution

timer

signal.

If

this

jumper

is

not

installed,

the

timer

will

not

work, and

XX

USEC

will

be

printed

instead

of

the

timer

value.

2.

Pins

3,

4,

5,

6,

11, 12, 13,

and

14

of

U68

select

the

block

of

system

ports

used

by

the

History

module.

Ports

40H-47H

are

used

so

the

following

jumpers

should

be

installed:

BOARD

0

40H-47H

1

·

..

16

2

15

3

14

4

13

5

12

6

11

7

·

..

10

8

·

..

9

Table of Contents

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