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Radio Shack TRS-80 Model 16, Руководство по обслуживанию, Страница: 76 / 92

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Содержание TRS-80 Model 16

Страница 1: ...ervlce CUSTOM MANUFACTURED IN U S A BY RADIO SHACK A DIVISION OF TANDY CORPORATION...

Страница 2: ...permission from Tandy Corporation of any portion of this manual i5 prohibited Whi e reasonable efforts have been taken in the preparation of this manual ta assure its accuracy Tandy Corporation assum...

Страница 3: ...Model 16 TRS SO Service llanual COntents Introduction 5 3 Troubleshooting Operation 11 37 7 of 2 Theory l Specifications 4 Printed Circuit Boards 41 5 parts List 61 6 Schematics 75 i 1tadle1Mell 3...

Страница 4: ...Model 16 _____________ TR5 BO e s_e_r__ v i c e Dual _ i ltadlellllleli 4...

Страница 5: ...e MC68 and the Z 8 A This allows both 8 bit and 16 bit selectable operation This manuai will provide information primarily on the 6a aide of the Model 16 For Z ag information that has not been include...

Страница 6: ...TR5 S0 Mode1 16 Service Manual ItlIdIeIllaeli 6...

Страница 7: ...or up ta 7 megabytes of memory Supports 8 levels of vectored interrupts Supports 4 levels of fixed priority bus arbitration Supports a Zsg ta MC68ggg memory interface controller The major components o...

Страница 8: ...s space after bootup la complete The major components of the CPU Board include za A CPU Z8 A eTC za A DMA za A SIO Ploppy Diak Controller printer Interface Board The Floppy Disk Controller FOC Board p...

Страница 9: ...tional boards include the following Hard Disk Interface Board 16K RAM bank selectable Interfaces te intelligent high speed eontroller l to 4 hard disk drives supported Major eomponents inelude 4116 16...

Страница 10: ...nents include MCM6665 64X by l dynamic RAMa CRT Display Module The CRT display module has basically the same specifications as the Model II video monitor however increased bandwidth 22 MHz is provided...

Страница 11: ...Strobes Clock Logic Refresh Logic Bus Errer Loqic Note The terms assertion and negation are used ta avold confusion when talking about active high or active low signaIs Assert or assertion iB used ta...

Страница 12: ...rrides the TR control line and that both drivers and receivers are disabled tri stated if BGACK is asserted Address Linea The 68 address Iines are interfaced to the address bus via tranceivers U14 U33...

Страница 13: ...up which always enab1es the drivers while the CO input is control1ed by BGACK which will disable tri state the drivers when an external device is bus master LOS indicates that data bits BO B07 are bei...

Страница 14: ...outputs from the processor chip which feed a 3 to S decoder U6 U6 is used to detect accesses to User Space either code or data or to decode the Interrupt Acknowledge sequence INTAK Bus grant acknowled...

Страница 15: ...or has stopped as iD the case of a double bus fault See Section 3 P za to 68 Meaory Interface Circuitry for more information Assertion of Bus Error BERR to the 68gg CPU indicates that a major error ha...

Страница 16: ...y mode bit 2 GINT Polarity selected by mode bit 3 IREQ Polarity selected by mode bit 4 Mode bits 5 and 6 select which internaI reqister ta be read on a subsequent read operation Mode bit 7 ia the mast...

Страница 17: ...outside the defined range Time out error generated when no DTACK is received with the 68 as the bus master Time out error generated when no DTACK i5 received and the 68 is not the bus mas ter parity e...

Страница 18: ...pace ainee page zero cannat he disabled Additionally two control ports must he initialized ta determine the addresses involved and the mode of the transfer The two ports are described in the tables an...

Страница 19: ...sserts uns CONTI 9 Enables ZS9 ta initiate memory transfers te or fram 68 J1J J memory space 1 Transfera by z89 disabled HALT J 681J J1J processor not halted l Halts 681J J J processor RESET J RESET n...

Страница 20: ...controller is properly initialized There are two things that cause the generation of a bus error The user addresses outside his partition A bus time out occurs A bus time out results when nonexistent...

Страница 21: ...wO 4 bit multiplexors LS157 select either the processor address KAl2 KAl9 or the User Extent Address UEAl2 UEAl9 to form the Effective Address EAl2 EAl9 MMA selects the address source and the upper pr...

Страница 22: ...st S BRS with REFRQ having the highest priority and BRS the lowest The bus requests are pre latched by a quad D type latch U64 clocked at a l2 MHz rate The bus request is latched at a 0 output of U64...

Страница 23: ...on controller will negate BGACK and allow the 68ggg CPU ta assume bus mastership See Figure 1 for the timing relationships of this circuit 12MHz 1 1 __ 1 Bus Request U64 3 4 6 11 REFRQ BRZ 1 BR1 BRO B...

Страница 24: ...HIIDTACK ls asserted a read or welte ta an onboard device is in progresse If RIp i5 asserted an interrupt acknowledge cycle i5 in progress and the interrupt vector data i5 valld from the interrupt con...

Страница 25: ...esponding device has been accessed and a time out error has occurred section 7 68 1 0 Decoding and Strobes The 1 0 devices in the 68 subsystem are memory mapped and consist of the lnterrupt controller...

Страница 26: ...he output is connected ta the active high enable input U36 pin 6 KAS enables the third enable input U36 pin 4 when an active low oceurs KAI KA3 are decoded ta determine the output of U32 that selects...

Страница 27: ...Mode1 16 Service Manual __________ TRS SC Il _ Q o u u Il Z e II l i en GO U l T 1 1 1 0 u 0 1 1 1 t1 1 0 t II 0 1 1 1 1 i Q U III CO Q II II II u III III c br i IItadIeIllaell 27...

Страница 28: ...68SSg subsystem The h art of the clock logic is a 24 MHz crystal osci11ator See the top left hand corner of sheet 2 of the 68 CPU schematic The output of the 24 MHz oscillator is hooked to U63 pin 4 7...

Страница 29: ...t of 124 which will equal 31 usec This configuration will generate less refresh bus request cycles thus allowing more CPU running time but to meet the 2 msec refresh specification two refresh pulses a...

Страница 30: ...w 1 1 E E45Jum_ E E Jum 1 MODE REFRO I L I y 1 1 __ XO i J lO l 1 J Xl 1 X1 JI III L j 1 i Nohl Each block between slgnels equa s one Pf OP sI81ton de V Figure 4 Timing far Refreah Loglc...

Страница 31: ...optiona1 byte parity for error detection It is designed for use with the 68 processor system The 68 has a l6 bit wide data bus and therefore the memory is 16 bits wide Because the MC68 needs to handle...

Страница 32: ...he 6Sggg CPU i5 used ta distinguish between upper A l and lower A g bytes then AI A16 is required To save pins and chip size the IC s have only 8 address inputs Therefore the address lines are loaded...

Страница 33: ...thin the 68 subsystern memory map allocation These address lines are connected to an 8 bit magnitude comparitor U2 LS68S which compares two S bit inputs The address lines are compared to a preset valu...

Страница 34: ...1 li g 1 2cgllllll 2FFFFF X 1 1 X l g li 1 3l1l1l1l1l1 33FFFF X 1 li X li li 1 1 34l1l1l1l1 37FFFF X 1 1 X li g 1 1 38l1l1l1l1 3BFFFF X 1 g X 1 g 1 1 3Cgllllll 3FFFFF X 1 1 X 1 g 1 1 4l1l1l1l1l1 43FFF...

Страница 35: ...h memory byte section The signal CAS is AND ed with disabled by REF to generate CASU and CASL the column Address strobe for each word section The signal R W is AND ed at U15 with UDSG to generate R W...

Страница 36: ...logie 1 Mode1 16 TRs ao Service Manual If the parity is incorrect alogie S is strobed iota D flip flop U27 by AMUX This signal is then routed ta the selected system interrupt The signal is cleared by...

Страница 37: ...mory boards and rerun the Model II diagnostics Locali ing the Trouble Localize the trouble ta the Model 16 68S CPU Board or the Model 16 128K 256K Memory Board by following the recommended actions in...

Страница 38: ...in interface circuit Refer ta Trouble shooting the Model 16 Memory Board Refer ta Trouble Shooting the Model 16 CPU Board Troubleshootinq the Model 16 68 CPO Board Run Diagnostics Condition possible...

Страница 39: ...d memory modified Possible l auit Clock loqic Interrupt circuit 68111111 CPU Clock logic Interrupt control1er rnterrupt circuit Offset Limi t registers U11 U32 or U16 Recommended Action Check ciock ci...

Страница 40: ...U4l or U3g Check r o and strobe circuit TroubleshootiDq the Model 16 Meaory Board Run Diagnostics MOo16 Memory Modified Address Test Condition Bad RAM reported possible Pault Bad RAM Data buttera Addr...

Страница 41: ...TRS SO Model 16 4 Printed Circuit Boards 68 CPt Board Service Manual ItadI8I11ae1l 41...

Страница 42: ...Mode1 16 _____________ TRS SC s_e_r_v_i c e M an u a 1 _ Itad elllllell 1 H 1 c l il Ill 1 1 II l 1 42...

Страница 43: ...Model 16 ___________ TRs aa s_e r v ic e M an u a l _ lladlelllaell 43...

Страница 44: ...Hode1 16 _____________ TRS SO s_e_r_v_i_c_e H an u a 1 _ ltlldlelllaell 44...

Страница 45: ...__________ TRS SC li _ Model 16 Service Manua IIad eIlllJell 45...

Страница 46: ...l28K 256K Me ory Board T R S 8 0 Model 16 service Manual ItadIeIllllell 46...

Страница 47: ...Model 16 Service Manual TRS BO ltadlelllaell 47...

Страница 48: ...TRS SO Model 16 Service Manual ltadlOlhaeIl c _ oh _ 0 g 7 0 i t J J__o 1 i 48 1 l 1...

Страница 49: ...Model 16 Service Manual TRS BO Z811 CPU Board IIadIeIllllell I mO c ln f q 0 m c Don i 1 49...

Страница 50: ...Model 16 Service Manual T R 5 S 0 l t a d l e l h a e l l 5i1...

Страница 51: ...Manual SerV1 ce Model 16 TRS SO ltadle1llaeK 51...

Страница 52: ...Mode1 16 TRS SO s Ploppy Disk Board Service Manual y __ 0 t thl l lta tlelhaek 52...

Страница 53: ...Mode1 16 TRS SO Service Manual 0 0 1 c H Il Il 1 fOlIOl 0 lC U 1 0100000 Ut l 0 0 0 I t c r J1 0 1 1 1 I t t 1 t HU lIa l1le Ihaek 53...

Страница 54: ...TRs eo Model 16 Service Manual I le I 101 M J li IIi lil1 ICI 1 1 1 IQ1 IS1 lOi I J 1 1 1 181 IS1 11 lij1 181 le1 10 m rD 1 191 lil1 IQ1 101 Q 1010 W 191 IQ1 IQ1 m 1 191 181 IS1 101 m _ o aO 50 50 lt...

Страница 55: ...Service M 4nua TRS SO _ Mode1 16 ltacheIhaek 55...

Страница 56: ...Model 16 Service Manual TRS SO o ItMlHl1llaek 56...

Страница 57: ...Video Board TRs eo s Model 16 Service Manual ItadIeIllllell 57...

Страница 58: ...Model 16 TRS SD Service Mannal tadIeIMel 58...

Страница 59: ...Mode1 16 Service Manual TRS SC IIadIeIhaell 1 11 59...

Страница 60: ...TRs eo Model 16 Service Manual ltadlelllllell 611...

Страница 61: ...Soeket 211 Pin DIP 8511911119 U34 Soeket 211 Pin DIP 8511911119 U44 Bocket 211 Pin DIP 85119Jl1l9 U49 Boeket 211 Pin DIP 8511911119 U57 Boeket 211 Pin DIP 85119l1l19 U611 Soeket 211 Pin DIP 85119l1l19...

Страница 62: ...ial l UF 16V Electr Radial l UF l6V Electr Radial l UF 16V Electr Radial 4 7K Ohm 1 4 Watt 5 2 2K Ohm 1 4 Watt 5 4 7K Ohm 1 4 Watt 5 2 2K Ohm 1 4 Watt 5 2 2K Ohm 1 4 Watt 5 4 7K Ohm 1 4 Watt 5 22 K 9h...

Страница 63: ...8PF SlIv C Disk 831111683 C36 ll1l1uF 16V Electr Radial 83271111 c37 ll1l1uF 16V Electr Radial 83271111 C38 ll1l1uF 16V Electr Radial 83271161 c39 ll1l1uF 16V Electr Radial 83271111 c411 ll1l1uF 16V E...

Страница 64: ...1 AND OR Inverter 14 pin 74564 AND OR Inverter 14 Pin 7415148 Encoder 16 Pin MCM68 64 PIN 74LS283 Binary Full Adder 16 pin 74L5283 Binary Full Adder 16 pin 74564 AND OR Inverter 14 Pin 74564 AND OR In...

Страница 65: ...OR 14 Pin 74L53p 8 IN NAND 14 Pin MCM3482A 8 Bit Latch Inv 2p Pin 74L5244 Octal Buffer 2p Pin 74LS74 Dual JK FLIP FLOP 14 pin 74586 Exclusive OR 14 PIN 74LS174 Rex D Type FLIP FLOP 16 pin 1G Bit CPU B...

Страница 66: ...47 Socket 16 Pin 8511911113 U511 Socket 16 Pin 8511911113 U51 Socket 16 Pin 8511911113 U52 Socket 16 Pin 8511911113 U53 Socket 16 Pin 8511911113 U54 Socket 16 Pin 8511911113 U55 Socket 16 Pin 85119111...

Страница 67: ..._ t l _...

Страница 68: ...7451111 Quad 2 IN NAND 14 Pin 745118 Quad 2 IN AND 14 Pin 745111 Triple 3 IN NAND 14 pin 745111 Triple 3 IN NAND 14 Pin 74S 4 Rex Inverter 14 Pin 74537 Quad 2 IN NAND Buffer 14 Pin 74574 Dual JK FLIP...

Страница 69: ...4 665 U65 MCM6665 Dynamic RAM 2 ns 16 pin 8 4 665 U66 MCM6665 Dynamic RAM 2 ns 16 Pin 8 4 665 U67 MCM6665 Dynamic RAM 2 ns 16 pin 8 4 665 El Jumper Plug 8519 21 E2 Jumper Plug 8519 21 El3 Jumper Plug...

Страница 70: ...e 7 Nylon Cable Screw 8 X 3 8 Bracket Bezel Lower Bracket VIO MTG Bracket Bezel Upper Bracket Floppy Disk Panel Rear Connector Cable FDC Oisk Bus Plate Adaptor Screw 16 X 5 16 Caver Bottom OPOl P1ug C...

Страница 71: ...oc Wiring Harness Video potentiometer 59iK Brightness potentiometer 59 Ohm Contrast Screw 832 X 3 4 PPH Washer 62500 2 3F Nut Lock 832 Label UL warning Screw t44jf X 3 4 ZN Tab Faston GRD M16 Washer...

Страница 72: ...l CPU t 16 Bit Testing CPU t 16 Bit Re air CPU PCB 16 Bit F A FDC pea Subassy Jumper Plug8 1 IC Z811PIO Parallel 1 0 CONTR IC WD1791 2 Floppy Forrnatter IC WD1691 Floppy Formatter IC WD2143J l 4 Phase...

Страница 73: ...crew 8 X 3 8 SHT MTL REX HO Label FCC ID M16 10R Label SIN CPU M16 10R Label Part lS FCC Clamp Cable Screw 832 X 3 8 Tie 5 Nylon Screw 832 X 1 4 Screw 8 X 3 8 ZN Washer 8 Star Screw 832 X 1 4 Washer 8...

Страница 74: ...D Washer 8 Flat Screw 832 X 3 8 Tie 5 Nylon Tab Plastic 1 X 1 Case upper MOD 16 C Screw 832 X 1 2 PPH Iosert Disk Protector CPU MOD 16 Final Assy OP09 M16 IDR Burnin OPOl M16 IDR Test OPOll M16 IDR Q...

Страница 75: ...TRs eo Madel 16 68111111 CPO Bo rd 128K 256 Memory Board zell CPO Board Ploppy Oisk Board zell M ory Board Video Board Service MaDual ItadIeIllaell 75...

Страница 76: ......

Страница 77: ...o CILITDL I 1 I c 1 t c M 1 0 1 t t 1 f l t f l J U t P l I ou t 30 l Hl le c L _ i r 314_ Sil IlOt JI L_I l LOW TA _ s 1 l _ 0 O l 1 1 1 1 l 1 1 a 1 1 o _ 1 1 0 Il 1 1 l o 1 1 cO _ _ J __ J 11 Jl n 0...

Страница 78: ...C IJ U on Il r c 0 r cl HIC 1 U 1 1 H T n 1 J NL 1 0 _ 0 on H l PI r l 2 jJ 1P j t Il _ __ 1 L _ CO 1 l _ ULI 1 10 0 1 1 1 o M c f c II ft li o P _ N fU l lill _ fl nJ c _ c un n on 1 _D 1 O r T jf s...

Страница 79: ...T n 0 Ut 2 ut AS f l uV 1 1 lot 3 lw r t r _ M XT l o O n JOl u M M uMI m _ llDol_ 1 H In _ _ 0 u GA 1 0 jiffi 0 f Ut c 10 1 M M M M u L lNA c 11 v v u oolll ll 0 DTllLn p T Il a KWT la AIl n r 00 1...

Страница 80: ...111 m _ If l l D l OURAl O I DIll DOI 1OGl 1I I 01 DI TOI u _ aD _110 111 8bt QI 1_ __ _ nu PUonNCI llCI CI K Al I _ _ MODEl 16 BIT MEMORY BRD...

Страница 81: ...1 T Il r 1 v 1 r 1 l l _ _J l l _ it L Ci88 o _n _ _ t _ aD a _ 710 m AI _ Y DlI UI _ 00 0 _ N ODEL 16 BIT MEMORY BOARD D 2...

Страница 82: ......

Страница 83: ...riVrS THI s f P I P 3 DtO U4 Dt O Tt IlCl ITfll _rCll Pl l s 2 ui JJ J I _ R 0 1 l _ _ _ _ l _ l 1 38 j 1 R iJ N c 5 SII f UZ5 14L Il oJ 3l K p N t lI 00 _ q J iD q t i tl 1ff r v I I UZ U26 1 Ht S7 j...

Страница 84: ...9 IEJ _ rPlB SR 4 QATIO ill C 0 PI1 L___ pATti t cm C D Z Iill IN jLt O irE 1 1 PAUl E roKQ SIV 0 11 3 J PAIIl li 6T2 A V Q4T1L CiD 1 ot 0 ATJtl 1 Nit r J CcJT F 1 1 r IJdHt 14Aoo 1 HV 7 r 0 0 fIU f...

Страница 85: ...i u l _ _ _ _ t t 11ii _ _ K 4002 2G AOO FROPRlmRY liFCJUlnOM rr r nI r f Tl 1 1 1 II L 1 I T PI l UY CI lm cOl lm u o tT 1 cr l f 0 UI I ra rm 1 fTDI III lUI c c _1111 _ Bal 1 ft 1I1a il U 4 1 JI 5...

Страница 86: ...TO C SUMPE Il A J UMPEI 6 CONTU tJEO 2 __ z 1 LoJ 7 tH 1 1 1 c 1 n i 104 AJ O 1 1 i tl _ h n J C 1 n n u n 0 QJ oa r _ _ _ _ J z J woj 1 0 0 t nO 1 l l1 J J 1 u 11 H c I DESIGN INTEIIF tE BOOfJ Z 1 R...

Страница 87: ..._ 1 HI c C g t g c n CO CU G4e C ce ca 0 c O C ca c MEMORY l Il Il Il i l a i OOTZ DA 4 Il i l OU 1 11 75 1 O DA O 0 on 110 z _ V TERRI 3 _ _ __ _ _ t l f _ tWM T 5 r r U 1 l PItlPIIETARl IIfCRU nOl...

Страница 88: ...l mc T LUIl c_ OIDK _ _t1lOOO U U_T_ _ _fllJOtUlSCI _O o IIl _ on CMDIIl T_ ftlon e QIIfe DLOU an 1 LUIOl_ T l I lO __ DlO U _ COIrTWlU _ _ _ _ t U _ OC u mo _ _ _ _ IO zOKIU OICON 0 ll_ _1ftICDI 1 cM...

Страница 89: ...l 0 1 P I 1 T l C l _ __1 2 1 Q4 02S UQRIZ 8lI1 101TNfSS lO E R Il M CARO i5PTiOO i 1 K r r P f n t 1 REMOTE lUt o 1 BAllOIITNf5 S 1 SDDK 1 CDffT1l01 u 1 1 1 PI 3 4 4 __ I J 1 J 1 1 PI 7 1 0022 1 OH C...

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Страница 92: ...A FORT WORTH TEXAS 76102 CANADA BARRIE ONTARIO L4M 4WS TANDY CORPORATION 8749400 AUSTRALIA 280 316 VICTORIA ROAD RYDAlMERE N S W 2116 BElGIUM PARC INOUSTRIEl DE NANINNE S14D NANINNE U K BllSTON ROAD...

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