Commodore A500 PLUS Service Manual Download

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Summary of Contents for A500 PLUS

Page 1: ...modore shall not be liable for any damages in connection with the use of the information contained herein The listing of any available replacement part herein does not constitute in any case a recomme...

Page 2: ...US 2MEG 2 7 8373 DENISE HI RES 2 n 8364 PAULA 2 12 GARY 2 13 SECTION 3 TROUBLESHOOTING MAIN ASSEMBLY DIAGRAM 3 1 SECTION 4 PARTS A500 PLUS PCB ASSEMBLY 312812 4 1 A500 PLUS SHIPPING ASSEMBLIES 4 2 A50...

Page 3: ...l be the same as the A500 A new logo plate has been added to distinguish A500 from A500 Plus The color is the same light beige as the current A500 WHAT S ADDED 1 Meg on board memory expandable to 2 Me...

Page 4: ...ata Bus Memory Address Bus Active low When this signal is asserted it allows the A500 to detect the presence of an A501 The A501 Plus does not use this signal Active low When this signal is asserted t...

Page 5: ...is only required on the A501 to compen sate for refresh deficiencies in older revs of the A500 Swaps upper and lower bank DRAMs When 1 2 are shorted 1 1 and 2 2 open XRASO and XRAS1 selects the lower...

Page 6: ...OCK OPTIONAL DISPLAY RAM 001 01 100 NAAA VNAAAA expansion Kaaaaaa vwa 1 EXPANSION EXPANSION lAAA WA VAA Nl 8520 BFE000 BFD000 C0000 C7FFFF 00 04 08 DC0000 DEFFFF s CROSS RESERVED z DFF0000 CHIPS CONFI...

Page 7: ...K clock cycle tcyc 260 290 2 4 5 CCK clock high tch 130 150 2 4 6 CCK clock low tcl 130 150 2 4 7 CCK CCKQ clock separation tcq 65 75 2 4 8 7MHz clock cycle t7MC 130 150 2 4 9 7MHz clock high t7MHi 65...

Page 8: ...and cleared by the 68000 The four 4 mouse counters are controlled by the two 2 mouse joystick connectors These count the pulses representing the horizontal and vertical motion of two 2 mouse controlle...

Page 9: ...e four pot ports are general purpose I O ports They have counters for simple A to D digital to analog conversion of an external capacitor charging which could also be used for analog joystick controll...

Page 10: ...N ROMEN CLKRD U5 GARY 48 Vcc3 47 MTRX 46 MTRON 45 DKWDB 44 DKWEB 43 DTACK 42 HLT 41 RST 40 GND3 39 A23 38 A22 37 A21 36 A20 35 A19 34 A18 33 A17 32 EXRAM 31 XRDY 30 OVL 29 OVR 28 CCK 27 CCKQ 26 CDAC 2...

Page 11: ...v A500 PLUS SERVICE MANUAL IJOdlOd 0 P A eiisodiuoQ CO S S H CC 0 o v Q z CO OS CO o 7 o a CL X 3 ui u o Qfi A 3 CD 8 2 2...

Page 12: ...68000 until the display RAM buses are available Once the 68000 receives DTACK it completes the bus cycle Connecting the display RAM buses to the 68000 buses is discussed further in the section on bus...

Page 13: ...ledge Interrupt Priority Level Bus Error Reset Halt Enable Valid Memory Address Valid Peripheral Address Function Code Output Clock Power Input Ground Open Drain Mnemonic A1 A23 D0 D15 AS R W UDS LDS...

Page 14: ...custom chips and for determining the timing of signals to the memory arrays The above frequencies are true for NTSC Amigas A PAL Amiga will operate slightly slower with a main clock of 28 375 16Mhz Th...

Page 15: ...or the video RAM bus drivers appropriate to the current cycle Synchronizing the 68000 to CI is straightforward since the 68000 is clocked by 7M which is twice the frequency and synchronous to CI If th...

Page 16: ...ion Compare KTSC 7PAL S TV SYNC LIGHT PEN QATAtRDO R015 Sync Counters and Light Pen Registers I OOtS Sprite Vertical Position and Control Registers IEI wwi o u m Audio DMA Control Logic Audio Control...

Page 17: ...inter must be preloaded and is automatically incremented each time a data transfer occurs Each controller utilizes one or more of these DMA channels for its own purposes The following is a brief summa...

Page 18: ...on every raster line During the DMA no data transfer actually takes place The register address bus RGA is used to supply video syn chronizing codes At this time RAS1 and RAS are low CASU and CASL are...

Page 19: ...BLY GR AU 19 312502 03 KEYBOARD ASSEMBLY FR BE 20 312502 05 KEYBOARD ASSEMBLY SD FN 21 312502 06 KEYBOARD ASSEMBLY SP 22 312502 07 KEYBOARD ASSEMBLY DN 23 312502 08 KEYBOARD ASSEMBLY SEV 24 312502 09...

Page 20: ...A500 PLUS SERVICE MANUAL QQQQQQQQQ 02 ONLY MAIN ASSEMBLY DIAGRAM FOR MOUNTING ITEM 9 3 REQ D 3 1...

Page 21: ...A500 PLUS SERVICE MANUAL r 1 8 a a 4 1...

Page 22: ...R 312585 03 BOX PACKING A500 PLUS 368384 01 INTRODUCING THE A500 IT 363642 01 MAIN ASSY US CN 368385 01 INTRODUCING THE A500 SP 363642 02 MAIN ASSY GR AU 368388 01 INTRODUCING THE A500 NR 363642 03 MA...

Page 23: ...E IN USA SUB FOR 363641 02 LABEL RATING PAL MADE IN HONG KONG LABEL RATING NTSC MADE IN HONG KONG LABEL RATING PAL MADE IN PHILIPPINES LABEL RATING NTSC MADE IN PHILIPPINES LABEL WARNING POWER OFF STI...

Page 24: ...OF S RESISTORS V2 W 5 252122 01 RCA JACK WHITE AUDIO CN4 901600 55 CF 0 47 OHM R405 252122 03 RCA JACK YELLOW COMPOSITE CN10 901600 15 CF 47 OHM E501 E503 252122 04 RCA JACK BLACK AUDIO CN3 901600 36...

Page 25: ...ation may vary according to country some parts may not be available in all countries Part Numbers are subject to change see Parts Section 2 of current Techtopics for current numbers SHIP ASSY A501 PLU...

Page 26: ...hould be secured locally Part number information may vary accordmg to country some parts may not be available in all countries See Section 3 for Dis assembly diagrams MAIN ASSY A501 PLUS MAIN ASSY A50...

Page 27: ...number information may vary according to country some parts may not be available in all countries IC COMPONENTS RESISTOR NETWORKS 318099 04 318099 02 DRAM 256K X 4 120NS DRAM 256K X 4 100NS SUB FOR 31...

Page 28: ...812Jj TToiUF I 33UF IF100UF NOTE HEAVY LINES INDICATE A SINGLE POINT CONNECTION vcc C14 T33UF fH Ul fer c 1 733UF El 01 El 10 h Lt J 01UF 01UF U2 2 733UF XI IMJ C701 1UF 0Jf 03 U5 5 733UF y 6 733UF vc...

Page 29: ...16 1 OOUF 100UF 100UF w riOOUF 100UF 100UF CCKQO 5 7MHZ_flOz 4 E794 2 E103 47PF 1 El06I 47PF E107 47PF E108 47PF H 47PF C6 T33UF U13 C13 r33UF E407 h U33 C33 roiuF U15 CIS 701UF GROUNDED HOLES C io 10...

Page 30: ...DISABLE 3 REF TV J9 56 s SIGNAL GLOSSARY SIGNAL DESCRIPTION AREA PAGES AC23 1 PROCESSOR ADDRESS BUS 68000 D 15 0 PROCESSOR DATA BUS 68000 CASL U COLUMN ADDRESS STROBE DRAM 2 3 CCK CCKQ COLOR CLOCK QU...

Page 31: ...R OLDER REVISION 3 5 BOARDS SEE SCHEMATIC 31251 1 01 FOR OLDER REVISION 6C BOARDS SEE SCHEMATIC 312988 01 PCB R501 R8 ENGINEERING PROTOTYPE 06 18 91 GRR I APtyvcc a a ex C SfejeAse ihifctf g l Gifc T...

Page 32: ...O JP2B JP2flJg RP9Qli AAi RPgOlsf 68 1 68 RP9Qlsj g6 RP901 7 68 V Ai p 68 RP90l9f uo 68 P9029 uo MOiT B 68 68 RP902sr A4s 68 RP902 HaaU 68 RP9Q24 rA RP9032r 68 68 RP9034r A4l 68 R 03srsvm R R PPBm vOe...

Page 33: ...A3 1 1 11 T u _HE 16 0 XX 2SS Dl ihPit JSJ 256KX4 dram H0 CAS _RAS U3 XX42S6 16 no Al A2 A3 256KX4 DRAM A6 NC 4 C_RRS C_OE U8 17 16 XX 258 Hi DRAM 4 13 T3T AO At A2 A3 R 256KX4 DRRM Aa NC _CAS _RAS _h...

Page 34: ...xrrs i y _XRRS 0 F _xrrsi y MEMORY EXPANSION V V V _ VG V V V V V V V V V A VG V X 12X 5X 4 a 4 05 o7 e OS tO Oil 12 13 OH Ot5 16 oi7 oie 19 020 022 23 24 25 26 27 26 029 30 31 35 O f s 03i 35 036 037...

Page 35: ...11 U SX 5X R915 R914 0K IS 10 U9 STD P MSM6242B ALE C51 cso C JM C MR XT _XT 5X R912 iok TP9 6 8 45PF Trq Y9 32768HZ 17 2 1 22PF C911 MT1 MT2 MT3 MT4 i x H 470 09M 1N91 R911 h BT9 C9 REAL TIME PONER...

Page 36: ...CHIPS MFDIA CHANGF Fl OPPY READ TIME CLOCK REPP WRITE RTC MONOCHROMF COMPOSITF VIDEO VIDEO COMPOSITE SYNC VIDEO CI FAR TO SEND RS232 PORT INT 2 3 S I ORF SE T IPL 2 03 KS CLQ CK KBOATfl KBRESET LDS UD...

Page 37: ...ER OUT PARALLEL PORT 6 PI PRRRl l Fl PORT DATR PRRRLLEL PORT 6 RRM ENABLE CHIPS 2 CHIP REGISTER ENABLE CHIPS 2 ROW ADDRESS STROBE DRRM 2 3 DRIVE RERDY FLOPPY 6 7 GFNFRR1 RESET 6 9 1 REGISTER ADDRESS B...

Page 38: ...O9 _RSOJL 22 _BR _B0 BORCK BEER c 23 24 25 26 27 26 2a 15 Ui MC68000 _IPL2 IPLI IPLO FC2 FC1 FCO E CLK UDSO3 LDSO3 RSTO HLTO9 19 21 10 VMfl VPH 18 17 UDS LDS JtST MLI R23 A22 B21 R20 R19 RIB fl 7 R16...

Page 39: ...S 9 10i OCCK JL it CCKQ 4 aufl O_CDRC U2 8375 RGNUS HR RCA8 RCR7 RCR6 ROBS ROfH RCA3 RCA2 RCfli CRS9 CRfta CR 7 CRR6 CRRS tRR4 CRR3 CRR2 CRfil CRflO 26 8 27 26 B 29 5 30 4 31 3 32 2 33 1 SS 9 50 8 49...

Page 40: ...CflSLD _CRSUO U34 74F373 18 17 14 13 03 D7 D6 02 05 01 D4 DO Q 0 06 02 Q Ql 04 iij oc o it 19 16 15 12 U35 11 74F244 13 15 17 2R1 2R2 2R3 2R4 2Y1 2Y2j 2Y w2Y4 o t U35 74F244 1R1 1R2 1R3 lR4w o 1Y1 1Y2...

Page 41: ...ME _0E XX4256 12 WW 17 16 H 18 19 01 02 D3 04 HBO I iP2 05 H7 A8 U17 CAS _RAS ME _0E XX4256 12 17 16 18 19 01 02 03 04 no ai A2 A3 A4 A5 06 07 1 08 NC U21 CAS RAS WE 0E XX42S6 L2 NOTE JP4 BYPASSES U32...

Page 42: ..._ 47PF U4 MOV M1V MIH DENISE HR 8373 I R0A8 RCA7 ROfle RCR5 RDfU RCR3 RGR2 ROBl iiCCK BLANK CMC 7fl PIXELS BUR5T 23 22 21 20 31 30 29 28 27 26 25 24 Jl_ 18 OMOH OMIV s OMlH flO m A2 A3 B0 61 B2 B3 74...

Page 43: ...CLK Ql tt RP 403 4 3 47 MAOZa Z JZ RP403 9f T0 47 KXK_C PIXLSW CN9 RP4Q3 7 8 47 RP403 5f n6 47 VSYNC 43 HSYNC RP402 9 sww47 fjpZr RP402 7 8 47 RP4Q 16 47 RP4p2 3r 47 E4 33 2 r 150PF CSYNC OR OG DB DI...

Page 44: ...28 29 RCR6 RCfl RGR6 RORS R0R4 R0R3 RQR2 ROftl one CCK CCKO 11 FIREOO _LPENO r JP8 _FIREl Cf U3 8364 PflULfl C RESET POY POX PtY PIX _1NT6 _INT3 _INT2 RXO 33 3J_ 36 35 C312 C311 C3M C313 047UF 047UF...

Page 45: ...LUS SERVICE MANUAL vcc 4 7 1 2W LEFT JOY CN1 DB9P OMOV OMOH OM1V OM1H OUSE JOYSTICK PORTS RIGHT CN3 RCfi JACK JP10B gL JiO nUDOUT LEFT CN4 RCA JACK g rn W h f o 68D0PF J 6 5 4 j J _ TODO RNnLYZE RNRLG...

Page 46: ...19 34 TICK RESET 26 27 28 29 30 31 32 33 35 36 37 38 23 ZL 25 U8 RP501 39 AQ_ Pf 7 PflS PRS 8520 V I R PR3 Pfl2 Pfll PRO RS3 RS2 RSI RSO 8520 VIR C CS c_w 21 _IMT 19 34 riCK C _RES T PB7 PB6 PB5 P84...

Page 47: ...RS232 DECOUPLING KBDATfl _KBCL0CK VZLFIRE1 OJFIREO k RDY J G_TRK0 O WPROT kH CHNG ljO_LED 0VL ICC 12V 12V 5 C39 fS 5 U39 31 UF U38 i 2J a_I0RESET t flUDIN s anuoouT OEX NOTE E501 503 RRE LORDED UITH 4...

Page 48: ...OKWEO C ntR 16 C SEL c vcc 10K RPSOl CN13 INUSE STRTUS GROUND vcc KEY 5 t KEYBOARD CONNECTOR RESET VCC VCC R711 DRTfl CLOCK B PIH SIL FLOPPY FUNCTIONS DKWD DKWE U5 5719 GRRY C _KBRESET OH 100PF 100PF...

Page 49: ...RNAL FLOPPY LOCK DE I F RDY CF _DKRD L _MTRXE 2 _SEL2E fi IORESETO CHNGOH 4 PIN StL RO2 ro2 iE61 1 100PF i Z E612 100PF 1 CN 1 5 100PF Z E61 3 100PF i UEMUiiii IEMII m E615 1 00PF _ 100PF fm DB23S m J...

Page 50: ...3 Rev 1 Sheet 8 of 10 MEMORY El DRD 15 0 O t M 5 1 9 BDRR 8 0 C i D 15 0 0 R 23s 1 0 _R0MENO _EXTlCK Cf ROM JP7H U36 BCnSLC 1 io3 BCflSlK 1 JO1 BRRStOlO BRflS 3 10s X BWEO CCK RO CLKRDO2 CLKWRO v V V...

Page 51: ...S 36 37 36 39 40 3 44T y U y 4fr 4 y 5 54 55 66 VCC IK Jt 74LS0S U36 ft JP9 3 9 12V 0911 R911 BT9 0912 1N914 vcc t 3 60DK NI CD 4 5V 100MRH 1N914 A R913 4 7UF C913 I it U9 C9 33UF REAL TIME CLOCK n 12...

Page 52: ...990 i se 33 M 3 3 3 seo 039 40 041 42 43 44 45 46 4 48 049 50 4 W 5 54 0 C 5 r seo 57 59 60 61 62 063 64 06S 66 67 660 069 70 71 72 73 74 75 77 79 oei 083 085 s 6 3 60 iNm 4 3 86 PI vcc 01UF p_LZfl3 2...

Page 53: ...L 2i0 O vcc R192 _INT6 ZH V i IK R191 _1NT2 Z L SAL 1K Wvl AV w A W 4 7KX9 c RP111 10 rAAr A vl w AM W AM AAr AM 4 7KX9 RP101 vcl 2 9 JHLTO _RSTO BRO2 9 XRDYO _0VRO2 9 _LDSO _UDSO fftj RJO2 6 3 7 _RSO...

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