Commodore Plus 4 Service Manual

OCT. 1984 PN-314001-04 Commodore Business Machines, Inc. 1200 Wilson Drive, West Chester, Pennsylvania19380 U.S.A. Commodore makes noexpressed or implied war- ranties with regardtothe information contained herein. The information ismadeavailable solely on an as is basis, and the entire risk asto quality and accuracy iswith the user. Commodore shall not be liable for any consequential or incidental damages in connection ...

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MEMORY 64K RAM. 60K RAMUser accessible for BASIC programs. ROM 32K ROM Standard (includes operating system andBASIC interpreter) with 32K additional ROM con- taining the built-in productivity software. MICROPROCESSOR 7501 Microprocessor -- .89 or 1.76 MHz clock. DISPLAY 40 Columns x25 linesof text. COLORS 128 Colors (16 colors; 8luminance levels). CHARACTERS Upper &lower case letters, numerals and symbols. Reverse andflashing c ...

FEATURES Built-in extended BASIC 3.5 -- over 75 commands. Built-in Machine Language monitor -- over 12 commar.ds. Built-in graphics andsound commands. Screen window capability. Reset button (Warm start). Built-in integrated productivity software. PERIPHERALS C1551 Fast Disk drive, C1531 Datasette, MPS 802 Dot matrix printer, MPS 803 Dot matrix printer, DPS 1101 Daisy wheel printer, C1802 color monitor. OTHER PERIPHER ...

Top Case Keyboard, 67 Key, KKR-I Nameplate Shield Clip, RR Shield Clip, FF C251453-01 CC251501-01 C251655-01 C251855-01 C251856-01 BOTTOM CASE ASSY Bottom Case Foot, Self-Adhesive Paper Shield Shield Chip Shield Plate Insulation Sheet C251454-01 C950157-04 C310156-01 C310199-01 C310197-01 C310198-01 ACCESSORIES Users Manual Power Supply RF Cable Switch Box C310196-01 C310157 C326189-02 C904778-01 C- Commodore Stock Part ...

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-oj mm oo 02 :s::00 <.... __ mm mmC) :E til CS NN ::II "II :s::lii ... ootil-- ." 00 nm mm 02 <<-oj CO_ »» m_ :E .... .. »» ••»» ,,»» •••• oo mm -oj»»-- .... mm •• ~~ •• •• ~~ •• tilmm mm 02oo -oj mm... uu \\ FB4 f88 fB2 11 Q"a"r:::fB7 FB34l-}FB1O ~~ ....... ?il~B;:' NN EMZ L-------------~~~-1.~ 11 un <<11 U20 <~ (C' II )) :JJ ..., ..., (,) C's1------11 oo -< '" "" -ht' 30. -- -- ~~ ;;; ;;; ~~ 3, L- ...

PLEASE NOTE: Commodore part numbers are provided for reference only and donot indicate the availability of parts from Commodore. Industry standard parts(Resistors, Capacitors, Connectors) should besecured locally. Approved cross-references for TTL chips, Transistors, etc. will beavailable in manual form through theService Department in November of 1984. Unique ornon-standard parts will bestocked by Commodore and ar ...

(Continued) CAPACITORS (Continued) MISCELLANEOUS (Continued) C12 C13 C14 C15-C16 C17-C18 C19 C20 C21 C22 C23 C24-C26 C27 C28-C29 C30 C31-C32 C33-C40 C41-C51 C100 Ceramic 220 pF50V 251071-26 Sub: 220 pF 50V 150 pF 50V Ceramic Ceramic Sub: Ceramic Ceramic Ceramic Ceramic Ceramic Elect Ceramic Elect Elect Ceramic Elect Ceramic Elect Ceramic Ceramic Sub: Ceramic Ceramic Sub: Ceramic 0.1 Ceramic 0.1 150 pF 50V 0.1 µF2 ...

RUN 55 11 CLR CTRL) STOP,. SPACE or QQ 22 ww ~~ ... ~~ q;1 f-j\ 33 WW ~A SHIFT ZZ SS EE ...I. 44 \!...} ,\ :17 .," •• "" vv t:j"1\ 55 "" RR DD XX CC FF TT 66 SHIFT LOCK \!y T:It -Ef tjt "' ww SW 10' .L 77 YY GG "V 11 BB HH UU 88 '-V ..., "" "" ""Q tt '-V i"" -eN 1;;: MM ...K of'O ~0 14 RE. 17 ~~ ~~ 22 62) ~~9 ,I jJ f1\ ~-o. PP mm LL ,, .. :: II -- ~~'fr ~~ 'P 'P"" 17 @@ l'** ~~** -EI; =\1/ ,ESC 11== jj ++ ~~¢¢ ~~ ,DEL RETUR~00. '" @@ 11f1 11f2 f3 @@ ...

oS:--zz-- ++ en 0< ;I) z' ••oo •• nn rr AA '" '"-.J UU l.lJ uu '" J> -i ZZ ." DO '" 1Tl zz •• nn •• IIf- -- nn L-----~_=i EE •z L------:-.J:-:1 ~I ::1d" >1 JJ -- NN ..L-I~ rNl~ ~~ "" OJ 0> vv r-•• ... (Jo ZZoo nn FBZl nn oo 00 ,... -- ... oo l.lJ 00 DD DD •• ~~ •• •• •• -- •• ~~ -- ..... oo-- ~~-- .Ih~ICJ '"'" uu..., 0'. '" ZZ z:>- oo ... ,......I"" '" I:li':E1 -- -- l.lJ c: NN ++ "' << ++ U1 << JJ -- gg1~1~ 152~I~ ...

PIN CONFIGURATION VSS CSQ) CS1 RES RXC XTL1 XTLQ) RTS CTS TXD DTR RXD RSQ) RS1 11 28 22 27 33 26 44 25 55 24 -- 66 23 -- 77 6551 22 -- 88 21 -- 99 20 -- 10 19 -- 11 18 -- 12 17 -- 13 16 -- 14 15 -R/W -Q)2 -IRQ -D7 -D6 -D5 -D4 -D3 -D2 -D1 -DQ) -DSR -DCD -VCC U3-901895-02 ACIA TRANSMIT/RECIEVE CHARACTERISTICS CHARACTERTISTICS SYM -02 UNIT 22MHZ MIN MAX TRANSMIT /RECEIVE ** tCCY CLOCK RATE 400 -- ns TRANSMIT /RECEIVE tCH CLOCK HIGH TIME ...

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NC DIN WE RAS A(JJ A2 A1 VCC WE RAS CAS PIN CONFIGURATION 11 16 22 15 -- 33 14 -- 44 13 -- 55 12 -- 66 11 -- 77 10 -- 88 99 COMMODORE APPROVED VENDOR ACCESS POWER PART SOURCE 11 PART TIME CYCLES ACTIVE STANDBY NUMBER OF SUPPLY NUMBER (ns) (ns) (MW) (MAX)(MW) 901505-01 HITACHI HM4864-3 200 335 330 20 901505-01 NEC !-,PD4164-2 200 375 250 28 901505-01 MITSUBISHI M5K416NS-20 200 330 275 28 901505-01 MOSTEK MK4564N-20 200 345 300 2 ...

NC A12 A7 A6 A5 A4 A3 A2 A1 ACIJ D1 D2 D3 GND NC A12 A7 A6 A5 A4 A3 A2 A1 ACIJ D1 D2 D3 GND PIN CONFIGURATION 11 28 22 27 33 26 44 25 -- 55 24 -- 66 23 -- 77 23128 22 -- 88 21 -- 99 20 -- 10 19 -- 11 18 -- 12 17 -- 13 16 -- 14 15 -VCC -CS 33 -A13 -A8 -A9 -A11 -CS, -A1CIJ -CS 22 -D8 -D7 -D6 -D5 -D4 U23-318006-01 ROM- BASIC PIN CONFIGURATION 11 28 -- 22 27 -- 33 26 -- 44 25 -- 55 24 -- 66 23 -- 77 23128 22 -- 88 21 -- 99 20 -- 1CIJ 19 -- 11 18 -- 12 17 -- 13 ...

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CC12 '' II DV>3 .:J, pp '000' 120P 68;:;,'SO~ 560 >> R.14 C8 2.7k ~~ -331':;:' g: 'H~ vv ~~ S60 1-70;:01' L4 ...

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Troubleshooting Aides NOTE: Visual inspection is critical in this unit! •• The upright position of many of the components used on the board can create problems. It is possible for them to be shorted to the shield or to each other. Make sure they are evenly spaced and do not contact the shield. Areas of the PCB particularly vulnerable to this problem are: Bo ...