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Содержание MDS-A

Страница 1: ...North star MICRO DISK SYSTEM MDS A Contents Parts List 3 Warranty 6 Theory of Operation 7 Assembly and Check out 15 System Integration 24 Drawings 27 Copyright 1977 North Star Computers Inc...

Страница 2: ...North Star MICRO DISK SYSTEM MDS A Contents 3 6 Parts List Warranty Theory of Operation Assembly and Check out System Integration Drawings 7 15 24 27 Copyright 1977 North Star Computers Inc...

Страница 3: ...Be careful to insert all IC s in correct positions and with correct orientation 6 Do NOT connect or disconnect mount or dismount or in any way physically tamper with the disk drive power board or disk...

Страница 4: ...ard 5 x 10 1 bo1t 6 32x1 2 1 lock washer 1 nut 6 32 1 heat sink 61018 14 1 5 volt regulator 7805 or 340T 5 1 crystal 4MHz 23 16 pin low profile IC sockets 24 14 pin low profile IC sockets 1 34 pin cab...

Страница 5: ...OARD PARTS 1 1 1 2 1 1 1 1 3 3 3 1 4 1 1 2 2 printed circuit board 3 x 51 2 1 resistor RN55D 232 ohm 1 resistor RN55D 1 96 K capacitors 047uf ceramic disc regulator 7805 or 340T 5 regulator LM317K hea...

Страница 6: ...rmer capacitor 3000uf30wvdc electrolytic capacitor 2500uf 15wvdc electrolytic rectifier diodes MR501 3A rectifier diodes IN4002 IA bolts 6 32xl 2 lock washers nuts 6 32 hook up wire CABINET PARTS MDS...

Страница 7: ...aser nor does it cover transportation to the factory Also the warranty is invalid if all instructions included in the accompanying documentation are not carefully followed Should a unit returned for w...

Страница 8: ...commands to the controller The use of these bits is determined by the outputs of the board select PROM 2 write Data Logic If the controller is issued a write data byte command then the low orde eight...

Страница 9: ...ROM 8 8 Status Bits 8 8 bit shift reg Board Select Data Control Lo ic Encoder Controls to Disk Controls from Disk Data to Disk MDS Controller Block Diagram North Star MICRO DISK System to 8 80 8 8 bit...

Страница 10: ...ime afte the end of the window so as to be in the middle of the wr i tten zeros A read sequence starts in hunt mode When a sync character is detected the controller enters body mode Whehthe software i...

Страница 11: ...g I3S PROM address I Read byte from optional 256 bytes of PROM Case 0 can be made to address the standard PROM as well as case I by making the following modification to the MDS controller board Cut th...

Страница 12: ...ister is full If zero then gate status bits onto the Data Input Bus BST If one then gate B status byte see below onto the Data Input Bus If zero then gate the A status byte onto the Data Input Bus CC...

Страница 13: ...r On Indicates that the motors are on WRT Write Indicates that controller is ready to receive data bytes to write Bey Body Indicates that a sync char was found and that data bytes can now be read WP W...

Страница 14: ...ified area on the disk and a specified ar a of the RAM The algorithm now described accomplishes this task The program to perform this algorithm resides partly in the on board PROM and pattly in the DO...

Страница 15: ...ector pulse and repeat from step a otherwise done 7 If verify case then all is the same as the read case except that in step b data bytes read from the disk should be compared for equality with the da...

Страница 16: ...nge CONTROLLER ASSEMBLY For best results assemble the MDS controller using the following steps Between each step test that ground and 11 5 are not shorted since it is very difficult to debug a short a...

Страница 17: ...elec trolyt ic tantalum dipped mica dipped mica U U toward center of board U U toward top of board The remaining eighteen 047uf ceramic disc capacitors are bypass capacitors and should be installed in...

Страница 18: ...47 Ie s being careful to use the correct orientation All the IC s should be oriented the same way with pin I to the right Pin 1 is at the notched end of the IC package Some IC packages have a small do...

Страница 19: ...ls of the on board PROM memory and verify against the following table The addresses given are good only for the standard version However the values given should be the first two bytes even in a non st...

Страница 20: ...2000 hex 19 21000 20103 2006 2008 200B 200E 3A14EB 3A10EB E680 CA0320 3A04EB C30020 GO WAIT LDA EB14 LDA EBlfO ANI 80H JZ WAIT LDA EB04 JMPGO CLEAR SECTOR FLAG READ A STATUS WAIT FOR SECTOR FLAG SET...

Страница 21: ...needed to obtain unregulated power from a 115 volt AC line Some of the MDS PS parts mount on the Power PC Board and some mount to the North Star MICRO DISK Cabinet MDS CAB or elsewhere If this option...

Страница 22: ...rd The wires should be inserted into the PC board from the solder side NOTE If the MOS PS power supply is being used then skip the remaining steps of these instructions and go on to the MDS PS assembl...

Страница 23: ...c capacitors in the locations indicated by the silk screen legend Be sure to mount both capacitors with the n n side oriented as indicated by the silk s reen legend C3 C4 2500tif 3000uf 2400uf l5wvdc...

Страница 24: ...nd of the fuse holdeL with a short piece of hook up wire and then solder the other lug of fuse holder to lug 2 of the transformer 7 Put the fuse in the fuse holder 8 Solder the three transformer lugs...

Страница 25: ...he strap assembly from the DIP socket spreading the pins for the undesired straps and plugging the assembly back in such that the undesired pins are not inserted into the DIP socket Each drive should...

Страница 26: ...et with the four flat head screws The MDS PS power supply if used should be mounted into the cabinet 3 The cabinet cover is secured with six pan head 6 32 screws two on each side and two in the back I...

Страница 27: ...elected on drive number I loud click so nd The disk head on drive number I will now step out to track zero 0 to 35 rapid muted clicks After this the computer will endlessly loop within the PROM progra...

Страница 28: ...S2 RSI a RStj s L p U PM I o D VN nlL O S I o E VftI o E VI 0 1 vn o QQ V 1O W7 SYNC CHAR CLo K SHfT ___ ADb 13 Sf IFT 7 16 l ii l X m ADS BOARD READ SAY Ei t R EAD DI 11rI ___ Vl V VI VI cr IJL a 7...

Страница 29: ...EAD BIT SH FT BIT WRITE REQ WRITE RE Q WI IT C OMMANl BoARP R A LAsT BIT WR sflIFT COMMAND AD0 s AD4 5 Ao l l53 14 A AN 5 Ao lOt 74LS4z 2 syNc C HAR CLK DIREC TION ROO RST EC FlO No or NC c LK ARM FF...

Страница 30: ...Dz 4 p 3 Do LC LI I I H Ps 5 D2 4 D H 3 bo IG 74lS160 eelK sY W r7C CHriA R 3 sep CLK NIC e READ DATA l j 0 6 _____ SE P DATA h6 TC Q II It Gil 13 Q I 15 n N IE n s AlITO OFF TVRN5 MOTl R CFF AFTeR R...

Страница 31: ...1 c Ie R Tf J NS 1 10 MOTOI EMf H I 4 MoroR _SAM P 3 C b 8F eLK DI RECTID LEAD NO H II IS USEC 13 WINDOW WINDOW SAMP s DBIt I REAIl ____ I d eLK STEP FF s SECTOR FL AG q GA RST sa FlC __ 10 INT ARM CL...

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