Cromemco HD20 Hard Disk Drive 023
Contents
1. Z UNIT CONFIGURATION HD 20 97298 78 DIMENSIONS IN 5 FRACTIONS DECIMALS ANGLES ia d P t SCALE SHEET Fig 2 DISK DRIVE END a s a 3 lt gt INDEX STRIPE VIEW A TOP SIOE NOT SHOWN FOR DRAWING CLARITY INSTALLATION DRAWING DATA CABLE CONNECTION A C 4 yo Pou big AAT sr e a NNMOWS LON cayo Saa 3LON MIN 2 7 NOANIL Tard LIPO asia SYSTEM 2 FRONT PANEL RFAR VIEW DISK DRIVE MOUNTING PLATE Fig 4 INSTALLATION HD5 UNIT POWER CORD CONNECTOR J2 HOS CHASSIS viEw B E TERIAL ra porated VIEW A FRACTIONS a xx 122 NOTES 1 INSTALL MOUNTING SCREWS FROM FRONT OF COMPUTER BELOW HD 20 MOUNTING SURFACE 2 INSTALL HOZOFROM FRONT 8 32 SCREW INSTALLATION DRAWING KD ZO MOUNTING SURFACE MATERIAL g 10 UNLESS OTHERWISE SPECIFIED OUMENSIONS ARE IN INCHES TOLERANCES ARE FRACTIONS DECIMALS ANGLER MAK te te MAK FRONT VIEW C T2. 1 kot DA a ty NSRP 2 mn HD 20 Installation Procedure 7 AAA 5 si fe 1 4 CROMEMCO INC 280 Bernardo Avenue Mountain View CA 94043 Part No 023 6042 March 1983 Copyright 1983 CROMEMCO INC 11 Rights Reserved This manual was produced usinq a Cromemco System Three computer with a Cromemco HDD 22 Hard Disk Storage System running under the Cromemco Cromix Operating System The text was edited with the Cromemco Cromix Screen Editor The edited text was proofread by the Cromemco SpellMaster Program and format ted by the Cromemco Word Processing System Formatter II Camera ready copy was printed on a Cromemco 3355B printer _ 20 INSTALLATION PROCEDURE THIS PROCEDURE IS ONLY TO BE PERFORMED BY AN AUTHORIZED CROMEMCO DEALER OR REPAIR FACILITY BEFORE PROCEEDING MAKE SURE THAT YOU ARE USING THE CDOS OPERATING SYSTEM VERSION 2 56 OR HIGHER THE CROMIX OPERATING SYSTEM VERSION 11 16 OR HIGHER OR THE 68000 CROMIX OPERATING SYSTEM VERSION 20 14 OR HIGHER SEVERE DAMAGE TO THE HD 20 DRIVE MAY RESULT IF YOU USE OLDER VERSIONS OF THE OPERATING SYSTEM THIS DAMAGE IS NOT COVERED BY THE CROMEMCO LIMITED WARRANTY The HD 20 is designed to operate in a Cromemco System Two or Three Prior to installation verify that the drive is set up to respond as drive 0 The blue jumper should be on the lef
3. Signal cable should be routed to the card cage following the same path used by the floppy disk signal cable Power Cable Connection To install the power cable it is necessary to remove the top cover and the rear panel from the System Three Route the HD 20 power cord between the heat sink fins to the rear of the system and connect to the power supply as indicated below This cable consists of six color coded wires as follows Red 8 volts d c 3 amp line fuse Yellow 16 volts d c Orange 16 volts d c Black common Brown 115 voit tap on transformer White Neutral tap on transformer With the exception of the brown wire this color code is consistent with the color coding used for the System Two power supply Refer to Figure 6 s Wire Black Wire Yellow Wire Orange Wire White Wire Brown Wire The red 8v d c wire should be connected to the terminal on the very large capacitor which is mounted vertically on the back panel This terminal will already have several red wires connected to it The black d c common wire should be connected to one of the terminals of the smaller capacitors to which a black wire is currently attached The other terminal of the capacitor will have either an orange or a yellow wire attached In connecting the four remaining wires note that the connector on the end of each wire contains a male adaptor Once the connector is plu
4. below This cable consists of six color coded wires as follows Red 8 volts d c 3 amp line fuse Yellow 16 volts d c Orange 16 volts d c Black d c common Brown 115 volt tap on transformer White a c Neutral tap on transformer With the exception of the brown wire this color code is consistent with the color coding used for the System Two power supply Red Wire The red 8v d c wire should be connected to the terminal on either of the 130 000 mfd capacitors This terminal will already have one or more red wires connected to it Black Wire The black d c common wire should be connected to one of the 29000 mfd capacitor terminals where a black wire is already connected Yellow Wire Orange Wire White Wire Brown Wire In connecting the four remaining wires note that the connector on the end of each wire contains a male adaptor Once the connector is plugged onto a post the wire that was originally plugged to that post can be plugged onto the mail adaptor The yellow l6v d c wire should be connected to the 16 volt fuse holder on the side with the yellow wire going to the S 100 motherboard The orange l6v d c wire should be connected to the 16 volt fuse holder on the side with the orange wire going to the S 100 motherboard The white a c neutral wire should be attached and soldered to the main power transformer primary pin 5 on 8 tap transformers Use pin 4 on o
5. E TT TTT TTT gt gt pan a NOTES 7560 TEMS DELETED FROMM REAR FOR Z WEE LENGTHS oF PRWER CABLE DRA TD SCALE VIEW OF REAR PANEL TTS FOWEN ATE uoo uP EV FUSE NOLDER CB NEG TERMA Cl TERM AC NEUTRAL Bv FUSE nou DER TO RELATOR Soarb 41 gt 20 POLARIZING ORANGE BROWN a weal TE i YELLOW came 00000 mao oo 20 INPUT POWER CABLE SYSTEM 5 APPLICATION Ig 17 sauce SEALE 7 DESIGNER z 2 a FRACTIONS DECIMALS ANGLES race 1 xx t xxx t AVALE Z sten Breer ki Lramemco Ma Bernardo Mountain View 94026 2 57964 7300 aa VX 910 379 6983 CONVERTING HD20 57506 INTERFACE Summary The modifications outlined in this Technical Bulletin allow the existing 20 MByte IMI 5021H to be converted to use the ST506 Interface as opposed to the IMI bus interface The procedure will cover 20MByte drives installed in either the HD 20 or CS 1H products Completion of this modification allows the use of Cromemco s new STDC Controller Board which greatly enhances the performance of the drive plus provides a slightly larger capacity due to the STDC method of
6. SIDE J1 J2 Read Write Circuit Board Figure 3 DRIVE SELECTION OPTIONS IMI 5021H
7. formatting Materials Required Retrofit Kit HD21K A or 21 STDC Disk Controller Card Note STDC Card is not included upgrade kits and must be purchased separately Material List Kit ED2IK A CS 1H Technical Bulletin 023 9143 IMI 5021 ST506 Read Write Board P N 410 0450 STDC Read Write Cable P N 519 0191 STDC Control and Status Cable P N 519 0190 Power Supply connector P N 519 0199 Material List Kit HD21K B CS 2 amp CS 3 with HD 20 Technical Bulletin 023 9143 IMI 5021 ST506 Read Write Board P N 410 0450 STDC Read Write Cable P N 519 0195 STDC Control and Status Cable P N 519 0194 Power Supply connector P N 519 0201 023 9143 10 18 84 Procedure 1 2 3 4 5 6 7 8 Turn off the power to the system and remove the line cord before proceeding Remove the WDI II card and the associated data cable from the system CS 1 2 OR 3 Remove the HD20 module from Systems Two or Three by following the instructions in the HD 20 manual 023 6042 Remove the hard disk drive from the CS1H by following the front panel disassembly instructions in the System One manual 023 6022 For CS 1H systems the power supply cable with the new power cable provided 519 0199 and proceed to Step 9 upgrade HD20 module remove both the HD20 power supply and the IMI 5021H drive by following the instructions in the HD20 manual 023 6042 De so
8. gged onto a post the wire that was originally plugged to that post can be plugged onto the mail adaptor The yellow 16 d c wire should be connected to the 16 volt fuse holder on the side with the yellow wire going to the S 100 motherboard The orange l6v d c wire should be connected to the 16 volt fuse holder on the side with the orange wire going to the 5 100 motherboard The white a c neutral wire should be attached and soldered to the main power transformer primary pin 5 on 8 tap transformers Use pin 4 on older 6 tap transformers A black wire from the System fan and a white transformer wire are already attached to this point The brown 115 wire should attached and soldered to the main power transformer primary pin 7 on 8 tap transformers Use pin 6 on older 6 tap transformers A black wire from the system fan is already attached to this point This completes the System Three wiring of the power harness for the HD 20 Connect the signal cable coming from the HD 20 to the WDI II being careful that the cable marking stripe is positioned in the manner indicated on the WDI II x RED LED RED LED REVISIONS DESCRIPTION DRAFTSMAN pate arrnovac BLUE JUMPER CAP VIEW A TOP SIDE PCB NOT SHOWN FOR DRAWING CLARITY DISK DRIVE END VIEW PAAT MATERIAL APPROVALS FINISH CHECKER UNLESS OTHEAWISE SPECIFIED INSTALLATION DRAWING
9. ith a flat blade screw driver after the board is attached to the base This technique is required to prevent damaging the flat cable or connector contacts 12 5 506 interface card is factory set to respond as drive 0 DS 1 See figure 3 for the jumper settings to cause the drive to respond other than drive 0 Place a jumper in the desired location after removing the existing jumper located between pins 1 and 16 13 Re install the drive into the CSIH or HD20 cabinet Route the Read Write cable and the Control Status cable as the WDI II data cable had been routed See figure 2 for cable connections Install the STDC Controller board and connect the Read Write and control cables Connect this board last in the priority chain as described in the STDC Manual This completes the upgrade of the IMI 5021H drive to the 57506 configuration Perform the checkout procedures for an STDC system as outlined in the STDC Manual P N 023 2031 STEPPER MOTOR CABLE READ WRITE AND HEAD SELECT CABLE MOTO J ONTROL _ 6 BOARD CONNECTOR LED CABLE STEPPER MOTOR READ WRITE BOARD Figure 1 READ WRITE BOARD REMOVAL AND REPLACEMENT READ WRITE ABLE J2 DS1 58 oor RADIAL OPTION 57 RESERVED CUSTOMER 56 OF RESERVED OPTIONS 55 O RESERVED 54 25 5 s3 05 2 52 DRIVE SELECT LINES ps1 si 54 22 JUMPERS 51 TERMINATOR COMPONENT
10. lder 6 tap transformers A black wire from the system fan and a white transformer wire are already attached to this point The brown 115v wire should be attached and soldered to the main power transformer primary pin 7 on 8 tap transformers Use pin 6 on older 6 tap transformers A black wire from the system fan is already attached to this point This completes the System Two wiring of the power harness for the HD 20 Connect the signal cable coming from the HD 20 to the WDI II being careful that the cable marking stripe is positioned in the manner indicated on the WDI II System Three Mounting Procedure The HD 20 mounts in the area where the C and D disk drive is normaily located The HD 20 cannot be installed in a system with two disk drives four slots A B C and D To mount the drive and power cable it is necessary to remove the top cover and the rear panel from the System Three Orient the HD 20 with the power supply cooling fin up and the rear of the drive part where the signal cable is connected facing you See Figure 5 With the signal cable routed along the right side of the drive slide the drive into the mounting area far enough so that the HD 20 power plug can be connected through the top opening in the mounting frame Now slide the HD 20 forward until it is approximately 1 1 4 from the front of the mounting frame and attach the drive at that point by means of two screws as shown in Figure 5
11. lder and remove the disk drive power cable from the HD20 power supply board connector 42 Connect the new disk drive power supply cable 519 0201 by soldering the purple wire Cable Pin 1 to Connector J2 Pin 1 on the power supply board Connect black wire Cable Pin 3 to Connector J2 Pin 2 on the power suppiy board Connect the second black wire Cable Pin 2 to Connector 42 Pin 4 on the power supply board Connect the red wire Cable Pin 4 to Connector J2 Pin 6 on the power supply board Caution Use extreme eare when performing the following steps Failure to 10 11 follow the recommended procedure exactly could cause damage to the drive Referring to figure 1 separate Read Write cable from existing WDI I Read Write board using a flat bladed serew driver while board is still attached to the drive housing Remove three stand offs securing the existing WDI II Read Write board to the drive housing Carefully lift the WDI II Read Write board away from Motor Control board connector and tilt the board away from the drive housing Carefully disconnect stepper motor cable from the WDI II Read Write board To install the new 57506 Read Write Board connect the stepper motor cable Guide the Read Write board into the drive housing carefully lining up the Motor Control board connector with the socket on the ST506 Read Write board Secure the ST506 Read Write board with the three stand offs Carefully reconnect the Read Write cable w
12. t set of the drive select pins as viewed form the rear see Figure 1 Signal Cable Connection The 36 conductor signal cable is connected between the ED 20 and the WDI II The first step in the installation of the 20 is the connection of the signal cable to the HD 20 This must be done before the drive is mounted in the system Looking at the rear of the drive with the heat sink on the left the cable is connected with the index strip to the right See Figure 2 You are now ready to mount the HD 20 Refer to section of the following instructions which is appropriate to your system System Two and Z2 D Mounting Procedure The HD 20 mounts just below the two 5 floppy disk drives in the System Two Each of the two floppy disk drives is held in its metal frame by means of 6 32 screws Remove the two bottom retaining screws from each drive and then reinstall them so that the mounting plate for the HD 20 is attached to the bottom of the two floppy disk support housings Refer to Figure 3 Plug the HD 20 power cord into the plug on the HD 20 This connector is designed so that it can only be connected one way Now slide the HD 20 onto the HD 20 mounting plate Refer to Figure 4 Power Cable Connection To install the power cable it is necessary to remove the top cover and the rear panel from the System Two Route the HD 20 power cord along the same path as the floppy disk power cord and connect to the power supply as indicated
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