NorthStar Z80 Manual Download | Manualshive

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Summary of Contents for Z80

Page 1: ... J I NorthSIarCompuk2rslnc 1440 Fourth Street Berkeley Ca 94710 North Star zao Processor Board ZPB A Copyright 1977 North Star Computem Inc 1 25006 ZPB DOC Revision 3 ...

Page 2: ...ly Information Figure lA Component Identification ZPB Assembly ZBP Board Checkout PROM Option Assembly and Checkout Configuration Options Theory of Operation Appendix 1 Pulse Signal Detection Appendix 2 S 100 Bus Signals Assembly Figures Schematic Drawings 2 3 4 4 5 6 7 10 11 15 20 21 24 28 29 30 31 Copyright 1971 North Star Computers Inc HEVISION 3 pe p ...

Page 3: ...4 Do NOT insert or remove IC s from the board while the power is turned on 5 Be sure each 5 volt regulator is generating 5 volt output voltage before installing any IC s 6 Be careful to insert all IC s in correct positions and with correct orientation Be sure all IC pins are correctly inserted into the socket holes and are not bent under the IC and are not outside the socket 7 Carefully observe th...

Page 4: ...e appropriate RST instruction The logic may be disabled to allow the function to be performed on another board 3 FRONT PANEL INTERFACE for direct connection to IMSAI and other similar front panels 4 ADDRESS MIRROR feature to simulate the input output characteristics of the 8080 microprocessor This feature maintains compatibility with some S 100 bus peripheral boards Address mirroring may be disabl...

Page 5: ...the product to and from the factory are borne entirely by the customer This warranty is made in lieu of all other warranties expressed or implied and is limited to the repair or replacement of the product No warranty expressed or implied is extended concerning the completeness correctness or suitability of the North Star equipment for any particular application There are no warranties which extend...

Page 6: ...4LS00 1 74LS132 2 74LS02 1 74LS148 1 74LS03 74LS175 oJ 2 74LS04 7 74LS241 1 74LS08 2 74LS257 74LS14 1 7404 74LS32 74367 1 74LS74 1 8T97 74LS75 1 Z80A Resistors 1 100 ohm brown b1ack brown 1 330 ohm orange orange brown 2 470 ohm yellow violet brown 11 lK ohm brown black red 1 10K ohm brown black orange 4 lK ohm networks Part No 10 9 l RIK 1 2 2K ohm network Part No 10 9 1 R2 2K Capacitors 33pf 470p...

Page 7: ...egulator 78L12 5 volt regulator 79L05 24 pin rC socket 14 pin IC sockets 14 pin DIP header 1K resistor brown black red 3 9K resistor orange white red 3 9K resistor network Part No 10 9 1 R3 9K 2 2uf dipped tantalum capacitors North Star Z80A PROCESSOR BOARD ...

Page 8: ... use acid core solder as this can severely damage a printed circuit board When soldering keep the soldering iron tip on the pad just long enough for the solder to completely flow If the solder does not draw up the wire then more solder is required Do not use so much solder that it overflows the pad If a solidified joint is not shiny it may be a cold solder joint and should be remelted The solderin...

Page 9: ...omponent side of a printed circuit PC board All components are inserted f om this side component side and soldered on the other side solder side Locations on the PC board are identified by two character codes as marked on the board a digit followed by letter indicating the horizontal and vertical coordinates of the location Note that in North Star kits IC s can be found on styrene pads in position...

Page 10: ...Place the conductive foam or tube which contains the MOS device onto the PC board before removing the device from the foam or tube Also be sure both hands are touching the foam or tube when the device is removed from the foam or tube Once a MOS device has been installed in a PC board handle the board as little as possible Of course never insert or remove any IC while power is applied to the board ...

Page 11: ...istor Transistor and Regulator To 92 positive lead Quick Connect Lug Ceramic Disc Capacitor Dipped Mylar Capacitor Dipped Mica Capacitor Dipped Tantalum Capacitor Integrated Circuit lC IC Socket DIP Header Figure 1A Identification and orientation of components ...

Page 12: ...G Note that this socket has reverse orientation from all the others with pin 1 in the upper right corner zs Insert and solder the remaining thirteen 16 pin sockets with correct orientation Z6 Insert and solder the fourteen 14 pin sockets with correct orientation Do not install sockets in locations 5C 5D and 5E inside dashed line unless you are assembling the PROM option at this time Insert and sol...

Page 13: ...board to avoi the possibility of shorts Insert and solder the l00uf electrolytic capacitor C29 located ear 8A The positive end marked with a or a red dot should be oriented toward the right as indicated on the layo t legend Some capacitors mark the negative end with a instead of the p6sitive end Insert a1d solder the 39uf tantalum capacitor C2l near location 7G Be sure to orient the capacitor so t...

Page 14: ...ts too tight can crack the PC board With the computer power off plug the partially assembled board into the motherboard Then turn on the power with a DC volt meter check that both regulators are generating 5 volts output These voltages can be measured across the pins of C22 and C23 Wait a few minutes and measure again The regulators should not get very hot in this configuration However with all pa...

Page 15: ... solder joints are good i e there are no bridges of solder beween adjacent solder joints no unsoldered joints and no cold solder jo nts indicated by a dull finish on the solder B all IC pins are in the IC socket holes nbt outside the socket and not folded under the chip Pins folded under can often be detected by sighting down a row of chips to see if there is any blockage of light under the chips ...

Page 16: ...rawings if the signal lis identified with a bar over its name then the name of the signal is followed by a slash E g STORE in the checkout instructions When describing an AC pulse the notation W P refers tio a positive or negative pulse with a width of Wand a per iod lof P For example a posi tiv e pulse of width 125 nanoseconds a pearing every 25 microseconds would be represented as 125n 25us See ...

Page 17: ...n Released Depressed RESET MB pin 75 LOW HIGH 7G pin 6 HIGH LOW RST 5G pin 6 LOW HIGH POC MB pin 99 LOW HIGH C3 Check the auto jump logic follows as A Leave the board configured as in the previous StE p B Turn off the computer power and remove the ZPB from the computer Temporarily connect the PRDY signal to ground by soldering a piece of jumper wire beween 7F pin 5 and 7F pin 7 on the solder side ...

Page 18: ...ting an RST 7 instruction repe tedly Observe that all the data input DI lines are HIGH by checking the following motherboard pins p ns 41 42 43 91 93 94 and 95 C If you have an oscilloscope then check that the signals ZD0 D7 are HIGH during Ml at the Z80A chip pins p ns 14 15 12 8 7 9 10 and 13 D C eck that the following motherboard address lines are AC slgna s pips 29 34 37 and 79 87 E The RST 7 ...

Page 19: ...DSBL PMREQ PRFSH MWRITE RUN PINT PHOLD PSYNC PWR PDBIN SwO Location pin 3 pin 4 pin 5 pin 6 pin 7 pin 8 pin 9 pin 10 pin 11 pin 12 pin 18 pin 19 pin 22 pin 23 pin 26 pin 27 pin 28 pin 44 pin 45 pin 46 pin 47 pin 48 pin 53 pin 65 pin 66 pin 68 pin 71 pin 73 pin 74 pin 76 pin 77 pin 78 pin 97 Description HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH LOW LOW HIGH AC 500ns 2750...

Page 20: ... likely conditions dirty edge connector contacts bad Rarts other than the IC s bad connection in an IC socket or introduction of a short or open in the traces on the board Diagnosis of a problem in a previously operational board will usually be successful using the following procedure I I Determine that the ZPB is in fact the board that has the problem by attempting to use it in another computer 2...

Page 21: ...utators should be oriented so that the flat sides of the parts face the direction indicated on the layout legend Insert and solder the f lur 2 2uf tantalum capacitors C25 C26 C27 and C2S at 1 cation SB oriented so that the leads marked with a corre pond to the holes marked with a on the layout legend Using the l4 pin DIP header and some lead snippings construct a header to d termine the PROM locat...

Page 22: ...ro wait states at 4MHz about 300ns or faster and the memory itself cannot be configured to have one wait state If you are not sure your memories are this fast connect the jumper to get the system running and experiment later The North Star 16K RAM Board does not require any wait states Processor speed Normally the processor runs at 4MHz However provision has been made to run at 2MHz To achieve 2MH...

Page 23: ... connected to pin 1 or pin 2 with jumper wires All bits that should match a one bit should have their corresponding pins connected to pin 6 or pin 7 with jumper wires Figure lP shows the jumper pin assignments and some examples Auto Jump Address Selection Any of the 64K different addresses may be specified as the auto jump address with jumper wires on the 16 pin header at location 2E The eight pin...

Page 24: ...le if bit 9 of the jump address is a one and bit 1 is a zero then pin 10 should be connected to pin 3 or pin 4 If jump address bit 15 is a zero and bit 7 is a zero then pin 16 should be connected to pin 7 or pin 8 Figure lZ shows the jumper pin assignments and some examples North Star Z80A PROCESSOR BOARD ...

Page 25: ...knowledge response by the Z80 to a hold request PHOLD Indicates that the Z80 execution is suspended and that a DMA bus operation may begin Used to request the Z80 to suspend activity and allow direct memory access by a peripheral device Interrupt request line to the Z80 from the on board Ve tored interrupt logic or from some other board This signal interrupts enabled on 8080 systems is normally tr...

Page 26: ...a control panel to indicate that the Z89 should be iD run mode during a single step operation Always false On 8989 systems indicates that a stack reference cycle is in progress Disables 01 bus receivers and enables CP bus receivers Used during input of sense switches from a control panel Disables drivers for SMEMR SWO SINP SHLTA SMl SOUT and SINTA True when the Z89 is sending data out on the DO bu...

Page 27: ... outputs are fed to a priority encoder 8D The three encoder outputs indicate the highest priority pendi ng interrupt request These lines are merged with I bits at the mUltiplexors 2D IE to provide the correct RST instruction on the Z8 data bus ZD0 ZD7 when the multiplexor is enabled by MX EN The INT RQ signal out of the encoder indicates that at least one interrupt request level is pending and cau...

Page 28: ...lection 5E to start on any lK address boundary The address comparison to test for on board PROM addresses is performed by the exclusive or gates 5C 5D The PROM is enabled PROM EN if the high order 6 address bits compare during a memory read operation A wait state is provided for the PROM so that the rest of memory may run at full speed 27 North Star z80A PROCESSOR BOARD _ __ _ _ _ _ v Imrm _ _ _ _...

Page 29: ... 7D on the motherboard Then attach the test probe wire to jumper 2D pin 16 this is the input to the divider Next take the output of the divider at jumper l0A pin 11 and connect to the AUX input of the audio amplifier Finally connect the AUX input ground on the audio amplifier to signal ground on the motherboard This arrangement will divide high frequency signals by 4096 and thus put the resulting ...

Page 30: ...Ol 000 A10 D04 D05 D06 DI2 DI3 DI7 SMI SOUT SINP SMEMR SHLTA 2MHZ CLOCK GROUND PIN 51 52 53 54 55 56 57 58 59 60 61 62 _ 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 SIGNAL 8 VOLTS 16 VOLTS SSW DSBL EXT CLR GROUND optional PMREQ PRFSH PHANTOM MWRITE PSI GROUND optional RUN PRDY PINT PHOLD PRESET PSYNC PWR PDBIN A0 Al A2 A6 A7 A8...

Page 31: ... GATED TO OA rA Bv DVRIN4 Al IJ SEQLJENCE F C FIGURe I Z AVJ POJ ADDRESS HEADER LOCATION 2E WITH THREE EXAMPLE 1 ECTOR p North Star Z80A PROCESSOR BOARD ...

Page 32: ...280 CPU l t 80A PROCESSOR CONTROL LOG MWRITE SMEMR POSI PWA1T r i k f J I I j OQ 4 _ 4 1 4 iiC North Star Z80A PROCESSOR BOARD 31 ...

Page 33: ...om SHit I NC North Star Z80A PROCESSOR BOARD y pt HA aa p J h P PJQ ...

Page 34: ... i RE6VLATOIU VI1v III __ l _Vc 0 RloIH AL oJ eOAItO ADORE MIRIltOl t 1 ELECT ONE M J I i DR Z iiID j 81 111 SE f T GlNE 4MHZ XnL PI OVI DES ON WAI r STATE DISA I E i MM INrERRUPT 1 06 IC CUT IF CONTROL PANEL SOURces MWRlrE TO ENABLE ON MARC PROM liND NOISE RE C vc nON I North Star Z80A PROCESSOR BOARD ...

Page 35: ...Yo ZAS Vu DNZ 4 1 ZO l I FROM r IZ 1 3 TO SI T VBS 21 SHT j ZM Z03 I ZA3 I zoz ilP ZAZ Zlll fE ZAI ZlllP ZAt I cs PR V lJ 8 PROM EN If I Sf T 2 I ZBOA PROCESSO R ZPB A2 SoHT 40F 4 I 77 NOrl TIi STAR COMf VTER I Nt North Star Z80A PROCESSOR BOARD ri REA P _ 5 ...

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