Specifications

ManualsBrandsVax ManualsHousehold AppliancesV-092

7.0

MICRO

DIAGNOSTICS

t

OVERALL

MICROCODE

STRATEGY

The

VS100

microcode

is

defined

as

the

16.0

kilobyte

powerup/diasnostic

packaSe,

implemented

in

Motorola

68000

assembly

lan~uase,

and

resides

in

read-onl~

m~mor~

on

the

Display

Processor

Module.

The

microcode

is

responsible

for

down-Ioadins

the

displa~

fi~mware,

but

is

otherwise

invisible

to

the

host.

Host

(VAX-l1)

diaSnostics

are

the

property

of

the

Macro

Dia~nostic

packase,

but

may

call

the

Micro

Diagnostics

via

the

Reset

function.

When

the

user

loSs

in,

control

ovar

the

68000

uP

shifts

from

the

microcode

to

the

displa~

firmware.

The

microcode

is

comprised

of

four

major

sections;

Powerup,

Idle

Loop,

Command

Loop

and

Maintenance

Mode.

The

Powerup

code

is

responsible

for

testing

and

initialisins

all

hardware

on

the

terminal

end

of

the

VS100

system.

The

Idle

Loop

performs

a

modified

continuing

seauence

of

the

Powerup

code;

and

polls

between

tests

for

Host

WGA

commands,

Mou~e

Login

events,

and

Kesboard

Maintenance

Mode

entry

events.

The

Command

Loop

waits

for

and

processes

WGA

Commands

until

the

host

sends

the

Reset

Command

to

return

the

processor

to

the

Idle

Loop.

Maintenance

Mode

is

used

primaril~

to

test

the

four

input/outPut

devices

that

may

be

attached

to

the

VS100

terminal:

1.

DEC

LK201

Universal

Keyboard

2.

Philips

Monochrome

19

a

/60Hz

P4

Landscape

Monitor

3.

Hawles

3-button

Mouse

Pointins

Device

4.

aTeO

11·

Disi-Pad

Graphic

Tablet

with

5-button

Cursor

(optional)

These

devices

reauire

a

human

interface,

although

the

Kesboard

and

Table

also

have

self-tests

which

are

called

by

the

Powerup

code.