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oort

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yj U"U'T

í L-' ' ~ — _¶kW > . 4_ · . t: I ' LA' F } L.' L..

to

by

the'

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response

time

by

about

four microsecords.

C.

J2

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Front

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erfáce.

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a

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te

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s7áve

te

a

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front

panel.

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usaqe

on

J2

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as

follows:

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=

Ground

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3 ₌

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T L

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wrap

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mst

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the serial

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riás

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i-Cl

rec{-jari¡zE

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resµond to

an

ir:

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request.

frorn

the master.

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soft'bA,'áre

irí the

s7ave

must

not re-ercMe

interrupts

for

at least

six

R":

icr'Ds.econds,

end

tN

£c}T"Z'i/,'are

in the

:

:úzsÍ:er

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Uie

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"the

slave

fails

to

resporM

iri

a

pr'ecieterrííined

aríiount

of time.

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r¡o!^ñiá¡

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vector

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ZEN

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vector

to location

CKJ'38H

(RST

7)

if

the ju

per

between

JG-LA

and

JL-5Z'

is

removed.

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in

p7ace

of

any

other

jumpers,

you

wire from J4-48 to J¢-54, the

master processor

interrupt

becomes

a

non-rriaskable

interrupt

(Ñi'íl) to the

280,

O · %

causi'"€

a

vectm" to location

OSi64.

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that

nc

il°TerruDt

will

be

effective

if

the slave

Z8C)

is locked ir,

_a

wait

state

rec;j2stinQ

service

on

the s>ve

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CiT 'j\'"¿)': 3\""í3:

árig

~'

dcta.

In

arm

case.

the

:-'29'{'

c)!"

ú'R'7"t

i','ii1

?F'í:

£"ar

ti":

!""ÜÉjC:'"iC},jt

ttiÉi

zn,G!^é

.

bd ~

} > C . '

r I r ~ ~Lm r . Cl " " '" l : _{e ,} P"

:

P t _{_} 1 '

:·: ::'"-r"¿j"Z Q.

r

;Z

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r

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'

"' ;:, " '"'·": =

r

gµ'~ ~ "

{

_ ~1 i _a.hEr_!~_~ ~ S ~' ~ C"c' } b b.-f b L l pg_« i l.-_{_}g.- ~¿ i '4——'~ b.d~ Y L U b L- U * · " I I PL^ I t l u U .

c'f

the

i,:

r:;|Úr','

address

síjácc

will

ái\',"á',"s

¿;';"ear

as

Rµ,: '"i,

and

Y'e¡"":,3!"7i3e!^.

the

shcdo'v','

4r p y

?üx':

is có1'trc7j2d

Ly

a

bit

iri the bíiárt

ccmtro?

;jái^t..

sc

the

?c',·,'¶'"

u.

\·,'i}}

: -L ' _ "", t %t T"".'"'.m\ F.k ' ' ' b t · : r" , > , I " '

::¿:.':F"3U2r' ZS

éi¿í"itit"

i1i4i"·

gr

?"ííj!":

.

cÁix'rmñc'

óri

í.f"i2

star-z

c/í 7¿

,',az

¿j

i

t

. \

"

The

í/'O

'xjrts

on

the

FEJT/3C'

zríd

EX?/8Cí

take

up

two

identical

ranges

of

16

port

Cu

c7í2ssés.

C)C)F!-ClT¥

and

E)9-m27X.

TP:

zre

is.

ríe

¿jff2|-"fgr}ce

:

.te .:

':céñ

-;lgrtC':

'¡-'aric

gí'rí

8'38,

and

SCi

fcjt'"tii.

This is

CaúSéd

by

the fact

tNít

A7

is

im"iored

dürinc

on

bxírC decodinc

ctf

the

r"n^t

a"dress.

The

ccno7ete

list

of

~' ~"

)

' b

!/'C

yorts

is

tis

fc'liows:

LOft

RAU4E

HICE

RA1'¢GE

Hj": CííOK

—

OCJH-03E

8"'H-83H

ltZi/'80

2661

04E-07H

84P!-87R

ZX?/80

2661

08E-C'EJ-I

¿2y-£¥Bµ!

EX?RC

Cer,troñics

Para'Íe7

?ort

0CE-03R

8Cf-

EDH

'X?j'?í)

9519,4

:nZe)^!^ug[

£cmtí"c·11er

0E¥)-CFE

t?E

-8FH

t¢ZT/8Cí'

S-lOG

Paralkl

?ort

The

port

addresses

for

the

EXF/80

are

c!eccjded

',':

hether

"-he

E)í?/80

is

present

o"

l"!ClÉ.

!'rD:

'}^amrjnQ

for

the

2661

is

covered

ir"t

/Lz/z'£'r{dix

/i,

zrid

oro

G I F

gram,ring

for

the

ZX?/'80

is covered in Section

III.

The

r£;#aina'er

of

ihis

section

will

be

ccncerned

\í'itñ

proyarí:

': ir!F'

the

SÁJ03

?arálle1

?ó6t.

-qq

"

" rj > C

t

' i C 5" 7 "Xr". : t r "' r"·

"

" " ^ i,^ ""-"" "" ""·S .. -- " r· I" - ' ·· X :: pr'r » C : ' ' ' ' "

"

'. IÍY': ":'

'"

r:

Tji

P i Ti "Pc _{L, i ,, ' ' . . "- ' . L - ' " ·} "" ' ' ' ' ' ' "'' ' "" "'"":' T" -" l : L. ' · P I ~ . . - . : ·-" '

" CCI ~' Xµ~-bT1~'u C L..i > ; .· 4- 4H——~P lt i , ·,. Lj · %dWUr-u· . .~ ~. , - ' Yt ',,. , , ,..b. J ~µ . - m t ~- M--— L.QÉ' ' '., m 0

P, ' _· : . · ' · : : L '. , - - · ,

·..-.b^ .. W —.· _ ~- í- L - ~ - : ¢ U - ; " : ;:

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l

_{l",?" zj/t} L i I _ t' G,I

"

_{' ' ' . ' ' · ~, i _ ~ ,}

q.d

IR

;"g'rt

f?Ek

is.

slave

cm

gort.

ÉiT:

inc.mt.

froííi'

í:

'w't

¿'Eld

will

D"ii3cc

t l

— 6 " - · " m · : . m " , . ^ ; . F a

· r- " · yr'._{'" ' '} "l ri T s" :"_{_} b' r-l I I" " _ ~ , ^ ' b-— i 'i": I' ~- " "' T t"' C.' ' " · ' ." :' i r"· ·

r

"? i -: : i' ' 21' · ' W T" T; I i" C:I , ·' P _ . · · C , C" : l I i. ; t c

G·' r '·~ 3 ; "~ \7 p · · ~ Üf Li t ¥Li É ü i Hr4 L· cE, · gp i I L-.I q',. ' -: j. ' \j '· ·.u¶,jA:~t Á h ~ b^ ~· V b-.~' L" ' m' q Wq Gr'

"" _ · - " "7 T T

c'%i"ier

sitie

gE

the iri'?.eribce.

C(: :ri'Y'¿-"|"S:-21:¿",

an

CíUt:

:"j:ji

T.C)

zc'r:

'í:

it',

',·:

i

l !

;mace'

r I " " ' " " I L n , £ " 7 ' Ü - _ b t m · . T r q 6

i-ríz

siave

"tr',tc

iz

í'.'tit

St2'-m

!jnL7:

U2

masíc'"r

T.é.':

2s

t.rl£

S,l¿;'í"2

sara.

i

t' e

tie

"L · I · m E t r " , - · F ' ' P " i

s : a '\;'e 7 s tic)

t

trí

oru_"

ot

7- h

c

£· e

'iat.a

\j,"áií.

s

...¿u; e s 'Y'.'ne!": , "cí";Z ;;'g,jZ-"~¿'P" e c c ':: s s: e:' s 'i- n e

aeta

pOrí

cjri

the náste'" side,

ÜiéR

e

'Jota

ct\:

'e|^!"L'rí

cÁjrlditi£jrí is

a£sL}:

"::ed,. ZiñC

tríe

Cj"\."i?,3: !jt'b:

iuiF{,/"f13µ

is

SÉt.

v:

hich

dtsú'1es

án'j

É't.'íure

slave wait stu.es

y ~

uñtz

i

trié cj'i¿rrun

CCTiG

í"-7c'n

1 s c ¡'"¿n^é.c', : É")fj s

.

"jr:

"

"lC'SZ E:

2","i"j

¿!c:

':g'czg- (i 7 :ú !2 e

protocol

reauired

of the

soft',','are

cari

tie

su:

"x'iarized

as

f"i11cn·:

s:

i

.

The

slave

initiates ali

trar!sacti(3ns.

?ío',·íever,

the

i'mzst-er

is:

a17íj'\','ed

te

RESET

ti"ie

siávÉ

c'"

¢é'+rat: e

_gg

sie-í'e

in'erru;:

t,

if

necessary.

2.

TN

rmmber

Cit

byzes

te trar:

sfér

rzíjst

be

krlc}\p¿n Ít"!

aGvance,

or

irr;b}en¿eG

in

Üje

Gata.

It"

the sjá\'E

must

Y"2áCÉ

to

2m5eddeC·

data

(Ienath.

status

bytes,

etc.),

then the masUr

F)rotéjco]

must

~ J

allow

én"niqh

time for

the slave to perform

it's

function

before

—

resumine

the Éransfer.

~'

3.

The

slave

will

g"nerally

use

í8C

block

l/C'

instructions

(!l"áR

end

O

IR)

to

access

port

BER,

a11o\}'jnc

the transfer

te

proceed

at

a

rate

(j2t-2rmirÍe:

A

by

tñÉ

master.

4.

If

the

abcve

rules

are

fciÍgwed,

the master

need

riot

check

the

s7zve

status

&ring

the

Gata

transfer.

The

Z8C:

irisÁruct'kns

INI

""" "' w·.-". ' "' r'·-A I,'":" ' p

"

r. r,, t l "\ r"'. _{— L" l_l}' " "·"·.i pi" "" ' '' · . · " , , .

,~ n r' t ! : _{,e- y}" m.Z I I r' _, i y· l

j

/_S""- _{·_ ' ·~. i-' t ..,_¥ b ,.l ,, ~" I · W : . ,;}

~' 0É~ 'u : a · ') \ ~ ~ LI :>" & V· L L { i ·w , , U - l^ ~· ' . . .-j ~ t- U L.. t LI t

-k ' ?" i t a" ' ' t i "_{_} ¥. ' :\ ' ' ~ '" "—r" . ; I ""r V' W · · ' '- '··"' ; ' µ~: , :" t -." — ' " "' V. T , r "': i "' ' " ' ' · _ , , , , , .~ } : m V"

i

._1t i ? ' &: . t : r"' " P' U EJ , , . _ , ' 4-m'—· "- ' ' ·_- ,' K.Á— . : , p' L.. lJ i ,d g.·· i ; 4 r'

'..AEt Le U { · ~ ' " C.

-

e '~' 7~' ~L d 4} ' X . .. H.'.' A

m f Z T r ", : ' 1 I · " · ' . "7

i orí

_.

7ríe

s:

'.a'i.us

ce

trié srjve

Sñí:

:¿'iC

:

jC

cri'."i-C"éC z:

':¡;"jit::·c7ztei'Y"

Y

µ' 1

f

"T

r

= p n "' ¿ ? ;- Á,^-

t

a 2 i

/ i'

c)ijE'í^a: js-r'

1~''_ P ~' : ¢- gj : : 1~ L

'

P L-ri ' ^ W _i —" m gi P

:

LÉrt

¿FE

¿.';:

:"Áá

l!"'íS

jL'r[z"lr:

írit

sensitz

'j'Z C.'::.:':',";"'·3.f"!'Z ¿Jl"iC' SÁÁz'j: jS,

"¡ri:.ítl"':"'"i2.:"i::n.

Ciri

iñÍjG..

Zpí2

bits

?ízí'e

the

fcj71c)ík,'jr!c

'"éarAnc'

P d ~ —

ml l it: = C:: .kC-.:

t

k"

"

y"C x m :-t c: t))"! a c

D í '~ . 'J _ '._ mh3 I ——L.'.

l

L>€. m I

·

)

W

3 ₌ ':

'g·jést

tjit

status

(;_S·ü','f

r Z

=

e'"L"kí"rur¡

status

(?=Üverruri)

7

= :·',::'Ze7'

?r2ser!t

(frorn serial

?zY£'jna1ity

bciard)

= S » I .,. :-. r-."Tí ,C:·C

\.: _{Ü - ."~1t ' — :}tC.u r <-

lj

ñ~íé

RP(jUES7

nir"l/'f1op

is

aa"iera1

2urF'c'se

ir

net.ure.

It

g",áv

be

set or

b q ' - , -~'

ckared

by

th.s

SÍ¿3'.'E.

and

may

also

be

clecred

bv

the master.

It

mav

have

anv

%J ~' »'

7"ur'cí.ior:

cesired

bv

tl"ié

sofu'.'are.

due

will

a2rierá}1\?'

tjé

:

jscc

i.c

g1sc!^"l2."lria[e

W I ~ G'

between

the types of

Cate

being transferred

across

the interface

(reqvest-

t-

ock

or

CufU9).

The

cver':

rjr

StcittjS

mav

tjé

set or

c7eared

Dv

the slave software,

as

V ~ C "

well

as

leino

set

by

the

harcÑ'are

rehén

a

data overrun is cki-ecíeci.

JMus,

the

LJVER"1Ul'¢

f]jp/f1op

ctúñd also

be

used

as

part i"f

2

qeneraí

Dti'"0"sc

orotoco1.

r . á

However,

data

may

not

be

transferred

when

O'JE'IRUN

is set.

l'bdem

Preserit is

' r" "7 " U t t

a

sicinal

\t,'rlich

\<3s

desi"íned

to indicate

'nihát

tvoe

cit

[}e}^s'jrai1[y

:

:'garg

ices

instálied

on

the serial

interface

(fjirect

or

':

óócr'),

'qD'Ñe'\'er,

since thé

sarrie

siqnal

determines

\\'hether

or not

a

remote

RESET

over the serial

ceble is

recc}ürlized.

the acEuñ

sA"ma7

conditiori

may

be 'mire

of

a

r"eí7ecZion

el'

the

state

of that

j'-m"'per

seiectable

optic'n than

a

reflection

of the tVijé of

;.'e"'scri--. L

ality

board

in

use.

yoi'jever,

this bit

may

still

be

useful

in

some

situations.

The

Únal

bit

rz:

"ksts

",'i'etñe"

tíiÉ

7c: ',','2)^ 4K

bytes

Cit _r:

"emc'ry

a"e

F:'""J'$ C"" : '"Ri:'{"", #

~~.

\ l

:- t", C T" 2 't' T ís ""

:

.:""'r".

i

f": Á7 ?\: j l C"=· E ! i

i

r" r' ;-ZY"t" Á 4 ri _{C : Z I ,},AÍ E "mC i .a, . ~ : . ,- " n.?~ \ : '4-P' U t . ; 4^ l : P L3 -:' \_ P u

1

' i . ¢- C-.( L La l I r _;i I l.. Lx~ m l LI : g~' *

~ ~

"" r ' t r,> ^ i k" " "'

r

' $r . "; " r :", »" " r r" + t} ^

t

i ."" L I^ ""· " ~ : .' "' r _{r"· ' : T r'"·i -T} : r"· """..,."'..ír ', · , _

.n ZJ í~ :J,";

¿|

C' i L-' l

t

: "' 1'¶/i ; u i · L i

t'

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t

1--.· .

r" : b 7 7 P " ' ' "

"' r"' }"1r ' T r ',

"

T ¢"1a'. i . " " Ei . " l r"". r . ", m C I Y' _ . ' "'·

"

' i r,

,,, x., r ' : .i.

r

, , , - C r· _ " · · " ' " ^ r" t . Y"" ' " t Á

r

, ' "

"

¿C. r r" " 1^r." d_L.eC

:¿I" ?",

j

, , , ... , . , ,. , ,

,

,

, , . , ' ;; e-Y F- : - I r" l ' · - ' , : ' 6.

r

; ' . · ·,"" C

w^i ' ·~ · · —+

)

m · b U , tt ": L"' ~ u L.K¶ÉLA; C ,., J l 1 L-r 'J t t LAu ;

{

LJ I L.-wj t i C · , .,. _ 4 '~ -. U-—' '

r" " : m

_L = t ; e> ·-\ " -- r, m

-T-!

: YC :_" i ! u i.-.La

m _{p' .>} r' : b " · '

.

.

sf ' W : ; : ' ' j M %..

U , ¥._ t t , ' , 2' i,p'_ ~l L- Li · u _' - -A ~ bd^

Z'

= l·:

éw

[l"¥'e!")^'ur!

SUÜJSv

1 ₌ p(c

efíect

. , , " p' T" _{_ p m}

/7. "

t

r "

I ; , : ; K. i [—t. ! i S

i '\ E \¥y l i '·'D . —qr -- l e » u 4^ LeLa

i'x:

c'jújüt

te jori:

Eñi

i':

i17

chzmcíe

al?

tñümé

t'

Es.

ant

if

not

ali

( c ~ m

are

tc/

Z'ié

ciiaíiced. the status

rriáv

be

read fruir' oort SE,

the

one

or

t.wc'

_· .' w i r

t'itÉ

',·,'Ñ¿r:

!":£téG

to

be

Muz:

"'eti

_Cá!^i

be

CÍi.2l'íCíÁ.

arnt

zcr;£ r'2si>'1"L ',','c:

u7í

t.hér:

3e

-',·,b'ritteTl

Zack

te purt

CFk'.

i;;.

:'rc)'3raz|mir)c]

the

?'¿ET/'8Ü

(Kaster

Side).

The

F(E

/3C'

azioears

as

two

i2(?.!"íse'cL'ti'L'2

I/O mjrts

to the

r:

,aster µ'rocessor.

The

é\'2l2

rui"'":

bered port

1£

the

.

Cata

pcn"t.

váñ1C

the next higher

cúid

rícrnbered

oort

is

t.he

cc\!"'7'Íar)d,/statUs

port.

he

uísÉer

sñct:

ld

never

access

the'

dzta port

unless

it

is sere thét the

s7ave

has

ernereC

it's

wait

st-ate.

If

the slave

is

ríoí

in

it's

\·;ggit

stáíe,

accessinc the data port

will

cause

ári

overrun coriditicn,

disabling

the

irter-~

face

until

it

is cleared.

The

section

above

on

slave

proCraR"|rning

contains

scme

s¿jcc·estjor!s

for

master/s1ave

protocols.

u

"

i _{~$ '} ; $ ' _{V" '} " " · . 0 P t t 4 "

t

me

Du'l

num:

:erec port

ccMZá"iñs

bit

séns"di\'é

cµ2i:

::ár|c'/sIa[!js

jríTcb!"r!'a-tion.

Reádinc

the

odd

port

gives the fol1owina

data:

.~' ~1

7-4

=

'Jnused,

iric;ettrK;jn8te

state.

3 = REQLIEST

is set.

2 = OVERRUN

is set.

I

=

Slave is réaCing,

and

waitirq

for

thi

r:

":ástér

tO

m"ite.

l)

=

Slave

is m"i;i"ío,

and

\','ditirlC

'fc'r

Ue

'":

ester

to

i"":

a'i.

~"

7"hE

rt'"i¿: 2sz

j7"i¿ c.',.t: !""r^üñ

stzi.us

bits

reííezt-

IUlÉ

suí-'íe

út

:

j:z

I " I

' ? j ,r "e " P t " , L ' "k ~ i _ . ' ' _{, , " _} '" ", t" " ·

: '- _{. ' i .} " .-t ---· ' . : I . , ,,' , : . ; ' : -' ' I : I ": "" i C, Ck_' _{l p, .,,} E T"-' : - .r"'S: : Ir\ , i l,-._ ' _, " _{g; l m-_ -. ~ '} ;- —

a

~

b 1 q l k m i m p : e . 3

¿'!i.ri2S TJ¿"! ;T]í:,|".¿c?£·

Il"i£

;)Ujr-c'cc)i

arni

cri'3"ct:

'icr'

r'zmGy

c':)ng?T]c·g'S·

¿'|jG µ!"'C"í.C.: '":tj"j':

6

érrg'rs.

bp'

r

_{7 t'" ". r . ,"} "'

r

' r' = f' '·'7

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t P i g s ' ' c l. U _{~ , i ~} U ¿j '-j u 'J

r

L i'; i l : _{·,. a Li 7j ~} G " C u

r

R! t :~, 4_.,?""';-jÍJ, :r.A \ e'.A.i J :;:

~ 1µ.G _ L·I-)

-.

be

c;: rle!"e[z'¿

vie

F-iCiC'

bus

pie

7?.

:

ms

:

'izit

is

rlÉ"¿2ss:

ar'l,'

',4g'T'íer;

2jcÍ

S:

':i2llC

-.

RESET

or

!!,":

"'¿"?..;.Lí?'" f::¡:·F:'.":";a!"!'ds..

hut

'y'y'jj ]

be

'z;,Á'?":~

2·ratF"lt

',),'i"ií""':"i£".:'í±r t!""ie '?cjG 2'£ilÚU

is

" · r . L r q , m ^ 3

"í'-¿'!"]t"{.2ri

ío.

^1e

c¿-: .::.¿ar}(j

lats

are

as

TOilC'r.'S.;

7-C

=

Linused

3 ₌

G'u:

r

t-he

FtEMESI

fFjg,/'fi"]F:

P7 : ; t

l

=

j:

"';jsgc

:

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p'¢cÉé

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the

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ír'terrupt

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3X?/8C'

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the

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the

INT

input

orí

the

Z80

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rather

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éciY sensjtive

irterrupts

are

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tiiÉ

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1979

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