Radio Shack TRS-80 Service Manual page 40

32
cf27
02·,1
T
7< -fl,,
V c
I
1'1. O'l.21.1.f' -,2v ~ ~
11
FRO/rl I
g "' ' ·"' . ,
POWEl\
z
•IZV
~
£.UYVLY
..
•5v
~
(
Cll7
,,:n,z
,,fl
G N D ~
2.
3
J_
P◄
:r•
11"- ,~
'l"OC
>--
Vu,.
5'f
:=iC.11'1 1
91G
(.130 .022
•"-- s
I
Vu,•
- 'PCLOCt\
~L
I
,.
11cc.
l.3l+4
bl
u•1
!IV
I!!
I.
C
"ROM - IFROM Al][Jl'!E:15 UU:.O[J/11/6 .:ii:;;
---------------------=•~,.r;:l"flrl'\,;""c-'----'-""-="--,
: Al O o l - " " - - - - - - - - - - - - - - - - - - - - - ,
r - - - - - - - - - - - - - - - - - ~ 5 7 A2
. . :;
3 , A5
I ! ,
A6
1
.,,,
Ai
a., ,o
a- ' ' - ' - - ' - - - - - - - - - - - - - - - - - ,
MCM3G4 <
1
,i
"ROMA G
~
~1~4============================~-
Cl• ~
e~xa a
~,~5-------------~
U 104- !, Ila (l~O,....C-------------.
~
CLACffi
r
....... L.~···
i,7.C
l.\::;c
AO
~o
~
r--
12 Aill
n,
AS
ez
11
q
iq
AID
IB., All
2.I AIZ.
G.71-''-'-7 _ _ _ _ _ _ _ _ _ _ _ ...,
CLOCK
tS
i\11
I
11.\70
>
Al
"'
A2
32
A'!>
3!1
A ◄
In. ◄
PCLOCK>----~ CLOCK A5
35
AG
3G
)\'J
37
AS
38
JG ' INT1t AO
39
-
u-n
<O
AIC
1
V I"
lb
Al
II
V •
AE
a
V
!5 A.::l
6
✓
'"
Ai
2.
V
~
18 A5
IS
V
7 AG
11
V
J A7
B
-f-..__- 7....1.::-".: -
12
Ae
6
V
14-
AO
..
uqzv
16 AIO
ZBD
All
I
PF.0CE55OR
AIZ
2
_ _!!L
HALTlf
A13
3
Al◄
1-t
Al&
5
L
N"1I.1i
17 3 A II
15
[>v
5
Al2.
/3 7 A1.;
' ,,
V
Al ◄
-
•
'
z.
. l-1(
" Al5
'
I
l-1'
-
M1Jf.
s _usq
~
:t9"RCl* ..
7
·;,z.'t>-"-. 1 ---------------➔:
,,-,-r,,,N,.-1\
'r'"
2•-- !
-RRO.-:l
,i~~)p- 3
;-
1
- - - - - - - - - - - - - - - . . . . , , . . , . IN'tf
>--•->---
~
~ - o a
e,
ti)
S
7...!C'
U11
N C . ~ - - BUSA~,lf
~
~ - ~ -
N C ~ PMRE"aJif
~
' - ~ ·.3z )
.t-~G_N_D ___
~
I
DECDDl/'8 :I.C. l
H l - t - t - - t - - - t - - t - H - + - t - - - - - - - - - - -
7
i
Al Oa~q'-------------1-1-t-t-t-f-+--1
'P-t-+-t--t---t-+--HH-----------:"c-iA2
Q I t-
6
" - - - - - - - - - - - - - 1 - - - t - - t - - t - - + - ~
....ir_ ➔ r-- ➔ r--+~--t""-~+-1r~+---_-_-_::_-_-_::_-_::_-_-_-_-_-_::_-_::_::_-~~~~A~
a l- 1 -'- 1 ------------+--t---+---t--+-1
+-+-H--t-t--t-----------3--,;:
MCM
:i92
a.:
~C,,,_ _ _ _ _ _ _ _ _ _ _ --il---,1-f--~
._~-+-+-+-----------'=;A
6 lWIII
11
~
1-
1
~~------------t--t---r-1
t,-1--l-+-+--------------1
1
A7
¾
t-
1 -"' 5 - - - - - - - - - - - - + - - t - - l
;.--H+----------2~z~'1Ae
i~;~
as 1-'"'-6------------+--i
1>-1-+------------=;-;,s:=--i;: "11-'..:..r _ _ _ _ _ _ _ _ _ _ _
◄
0------------" 18
~AII
_j!-. . . .
= ____ _.
r
ZW'l.fla:©
~
~
1
;..1o
0
~
11
-·:i_2 _ _ _ -_-_ -_ -:_-_ -_ -t-+---_ -_ -_ -_ -_ -_ -_ -_ -_ -_-_ -_ -_ -_ -_ -_ -_ -_ -_ -_:- :::~
A.E'SET1'<i-------,
3
0(
SFSH 1f
-~1>'-' - - - ----~,-_,.--c----------~'
W"R*
~
I ~ '2 UI~ IJD ll'--''...;. .. _ _ _ _ _ _ _ _ _ _
_,.'--A~-~·~•~O--~IE,~'--B.5,"';i__--------------++-~-+-++-+-+-+-1-+-----------------------------t--t--t--t--+--t-+-+--~-:,>D,P
~
117
~
-_-__J_2_,.' i
--~3",?---:,
~
RESET!> DI
loE--
1
-
5
----+->---------:-......
uqo
!E,-'-
17 ' - - - - - - , . . . . . - ' - - - - - - - - + - + - H + - + - + - + - H - + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - i - t - t - t - t - t - - t - - t - - -.... ~r-7' D 1
IN~~ /OOK.
1
3
DZ
• 12
,
LS
2. .. 5 ~!6;__ _ _ _ _ ,..... _ _ _ _ _ _ _ _
+-t--H++--f--t--1-i-+-----------------------------t-t-t-t-t-t--t--t----<;--➔::-
DZ.
DATA
------<!
C/15
•s
D3
~"=--+--+--+--...----~!f'---,11_
1
~ _ , • D3
J_,on
~1
""-r _ _
...__...-+-............... - - - - • -
tsOCl\rnu,>
,_.~!::!"'-----~--------+-+-H++-+--+-H-+------------------------------t-t-t--t--t--t--t--t---+➔
D4 Bus
"-::"' D-4 r- ..,.. p: ., -
cs. -~
"R2.5 D!S ~ - -
+---+--+-+---+--+-----
7
-~
11:::::...::t!!>~----~---------+-+-H++-+--+-H,-+------------------------------1-1-t--t--t--t---t-+---~
Dll
2'l•f
I
WAJT,f~ 7K. 12 U75 II 1)6 c..10 : -
~,2~----~---------+-+-H+-+-+-+-H-+-----------------------------1-1-t--t--t--t--+--+----<E:::,-
➔
DG
-., WAIT-A->- , _ _ _
13<Lj·o-e1_,,,J<,__~z.~,.--~Lw_A_rr_·*----=-e~l=-_r----D-7....,""--" 13 '---+--+--+--+--+--+--+--<lr--'-➔._ 1 _• ~-..';',.c.----~"-----~~--------+-+-H++--t--+-H-+-----------------------------t-t-t-t-+-t-+--t----<E-:c-➔
n,
WW+t-~WW..+-l------------~IAO----°";;:i
q ::: PD¢)
,11 \V 'V 'V ,
,1,, II -
· + - t - + - H - + - t - - - - - - - - - - - - : - 1
a, ,o ;:
P
n
1
JJD1'
J'De 1lD4 POt. o,"-''-'
------------+--t--t---t---1----:::,..
TI: 2
'l"DI P03
'PD-'
► D1
QS 13 , T·D
3
l24 11 : ~D4
!25 J5
;°
P.05
a_
16 ..._ 1'D~
07 f? ::- PD7
-t·SV
1'
AD
7
Al
5 ""'"""'"
5
AZ. 31Gl'.:
-+
A.!! Rtw,C
3
A4 lJ ID&
A5
z
AG
2.¥. XS
I 7
l"l
AID
U76 L,53',1
T
l!l"R
~
_l'Mllf ID
l'----.._
q ------"'--,~ "" - V .
-t--____,.,., ~
31 S3 Sit
~20! ['
y•s
q
U
100
Cl<
L51?i
@
.1'Tn1Ell#
7
,, IC1'1:Q.1t-
- 6
0:,
(9 1rnD11
RWR*
13
MJlle'QJf
'1.5
a1
G:3 ~ - - ~ C.NIOP,U!:,IMT
a ,2.
£Nl!Tr.
QI 2. E.NCASINTT
all •~
------';.£NGA51Nm
11.0YC? M ;,.---- - -
,&
•SV
NOTES:
1. All capacitors are in micro farads and all resistors
are in ohms unless otherwise noted.
2. On Revision F boards only, U62, pins 6 and 7 are
connected and pin 6 is not at ground.
FIGURE 5B. MODEL 111 CPU SCHEMATIC DIAGRAM - PROCESSOR SECTION