Radio Shack TRS-80 26-3501 - 3. LSI Signal Descriptions; SC43177 (CPU I) Signals

SC431n (CPU I)
3_ LSI SIGNAL DESCRIPTIONS
Pin N~ Si¥Iollllme
In/Qu,
0.,.,;,,1" 'UOl
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(h,p ~n.bl, ''f',,1 iIlA~J ",1«. "V"I)
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elli, f.,bl, .ipIoI ,RAM J ~ .. , ,,,,,.1)
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(h,p Eo"'I. ,...,.1 (RAMI .. 1«, "Inol)
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ChIp [.",1. ,ipal iDi,pol,y eIl,p 1 ,,1«, "pl';' '01 ,nr"' bulf" ,11<1 ,,,,,,for buff.,
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L"",n3~'''"'Y' Low /
0.. ...... 1<1';'1_ I",,,, .>.>" .. "",,1, t,,;g,
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Vr."
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Sol",« ><>lUI' i- " WIl ..... f b."",,\
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Vr~;
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a"", clo<k 1 puI>< "3001, 1 S~kH'1
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TEST!
Co""",,,d l!l G~D
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fESTl
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Il~SH
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All 11;< ........ ".h "pIIt
1'1",,,,011,' hilh bu' ''''''' 1<>., ~h<:n ,he All II."" S.'i'~ ;,
;>«_d,
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IlAM Dot. 11.0<1/'11.'",. >ian-ol
During d"pol.y' HI",
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I'r ...... ' k.y , .... ", " '" "",,,,,,n,.,ay t> Io~_
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In/o., ll.,. Ilu> (fo, .d~,,,, ~....,.""" of ,h. '.po, buff...- ,00 ".",f" buff" ,. RAM ,nd
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1)101
1",00'
1ll,f'bY Chip I)
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1010.'
Ourl", di,ploy' Uilll
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om
In/O'"
Du,I .. ,..~-irI ~.
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Add .. ,. Ilu> If." ,O<lt", d .. ogn,,,on of ,II< mp." bolff...- ,nrl ,,,,,,for buff...- In IIAM
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,n~ Di>pl., OIip I),
.. ~. 0 ..
W
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D",',.. dill"" ..
Mom.nlOry rro<"'''>r\
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M.
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Du,I"II ".d,ln
JnITII'JllIllII
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,,,
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C"D
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Sou'e< rol .. I" I(}V)
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l!tJsy "lI",1 10 ('I'IJ D ,Il,p. don"l .. ",.tlon In ll'lJ I)
lJu,inc dnpl.,_ w...
Du<i"~ , .. d I", ,", .. momo"'.,~y h,g,
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Key S,,<>be "",.1, RA,'>I Add",. "50"
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"" S"o"," llgnal, RMoI Md' .. , ''i'I,1
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