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Adaptec AHA-1740A manual

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Table of contents for the manual

  • Page 1

    AHA-1 740A/17 4 2 A/1744 EISA-to-Fast SCS I Hos t A dapter Use r’s Manual[...]

  • Page 2

    [...]

  • Page 3

    AHA-1740A/17 42A/174 4 EISA-to-Fast SCSI Host Adapter User’s M anua l[...]

  • Page 4

    Copyrig h t © Copyright 1992 Adaptec, I nc. All rights reserv ed. No part of th is publi cation m ay b e reproduce d, store d in a retrieval system, or transmitted in any form or by any means; elec tronic, m echa nica l, photo copy i ng, reco rdi ng or o therwise, without the prior written con sent of Adap tec, Inc., 6 91 Sou th Mi lpitas Bl vd., [...]

  • Page 5

    Technic al Sup port There are sev eral ways to get te chni cal ass ista n ce for your Adaptec pr oduct(s). Each is described below. When re q uestin g ass i stanc e, b e sure that you have the fo llowing i tems available (or if you write or FAX, send them along): • the mode l of any Adaptec hardware product(s) yo u have. • the mode l and versio[...]

  • Page 6

    [...]

  • Page 7

    Table of Contents Prefac e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix Co n v en ti o n s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x Chapter One Overv ie w G en er a l Pr od uc t In f o r m a ti o n . . . . . . . . . . . . . . . . . . . . . . 1- 1 Ins tallation S oftwar e[...]

  • Page 8

    Standar d M ode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 3 Enable P arity Chec k ing . . . . . . . . . . . . . . . . . . . . . . 3-1 3 Initiate Synch N egotiation . . . . . . . . . . . . . . . . . . . . 3-14 Enable Disc on ne ction . . . . . . . . . . . . . . . . . . . . . . . . 3-14 En han ced M ode . . . . . . . . . .[...]

  • Page 9

    Chapter Seven Troubleshooting Deter minin g Pro blems Using the LED . . . . . . . . . . . . . . . 7-1 Problems Detected During Installation . . . . . . . . . . . . . . 7-2 Problems Bootin g the System f rom a SCSI Driv e . . . . . . 7-4 Problems Using a SCSI a nd a Standard Disk Driv e . . . . 7-4 Problems U s ing Two SCSI Driv es . . . . . . . . .[...]

  • Page 10

    List of Figures Figur e 2-1. SCSI Device T ermin ation . . . . . . . . . . . . . . . . . . 2-3 Figure 3-1. S ystem Configur ation Over view . . . . . . . . . . . . . 3-2 Figure 3-2. System Conf iguration Detailed View . . . . . . . . . 3-3 Figur e 3-3. Chang e Resourc es Screen . . . . . . . . . . . . . . . . . . 3-5 Figur e 3-4. SCSI Configu ratio[...]

  • Page 11

    Pref ace This User Gu ide pr ovides inf orm ation relating to the oper ation of th e Adaptec AHA-1740A/1742A/ 1744 EISA-to-Fast SCSI Host Adapter in an EISA (Extende d Ind ustr y St andar d Ar chi- tectur e) system. Cha pte r On e , O ver vie w , prov ides gene ral infor mation a nd a list of files provided for conf iguration . Chapte r Two , Har d[...]

  • Page 12

    Conve ntions The follow in g ty pog raph ic c on vention s are u sed thr ou ghou t this Ins ta llation Guid e . bo ld Used for keystrok es (.. p ress the En ter k ey ..) and sc reen selec- tion fie lds (.. selec t Backup Device and ..). Helvetica Used for oper ator e ntr y that must be typed ex ac tly as shown ( .. device=c:c dromcdrom . tsd . .)[...]

  • Page 13

    [...]

  • Page 14

    Printed in Singa pore STO CK NO.: 5 10215-00 Rev B LL 8/ 93 691 south m ilpitas blvd. • milpitas, ca 95035 • (408)945-8600[...]

  • Page 15

    Chapter One Ov erview This U ser Gu id e provides softwar e installation information for the Adaptec AHA-1740A, 1742A, and the 1744 EISA-to-fast-SCSI bus mast er host adapters. Cumulatively the cards are referred to as AHA-1740A/1742A/ 1744 in this gu ide. The Adap t ec adl.exe down load utility and the ASW-C174 an d ASW -M1 74 softwar e packag es [...]

  • Page 16

    The AHA-1740A/1742A/1744 sup port s async hro nous, synchro- nou s, and Fast SCSI da ta transfer s on the SCSI bus. Asynch ro- nou s data tr ansf ers sup p o rt up t o 2 MBytes/sec , sy nchr onous transfer s suppo rt up to 5 MBy tes/sec , and Fast syn chr onou s trans- fer s suppo rt up to 10 MBy tes/sec . Dev ic es using differe nt tran s - fer ra[...]

  • Page 17

    The AHA-1744 microco de is stored i n an EEPROM. This allows the micr oc ode to be ch anged with the Adapte c adl.exe progr am. Th e adl .exe program c an also be used to determin e the ch ecksu m of the cu rrently installed micr ocode and low-lev el for mat SCSI fixed disks. Both the standard and enhan c ed mode microc ode c an reside in the EEPRO[...]

  • Page 18

    Insta llat ion S oft ware Software requir ed to ins tall the AHA-1740A/1742A/ 1744, in a n EISA system, is provided in the ASW-C174 softwar e packag e. The files con sist o f : Fi le Name File D e scriptio n !a dp00 00.cfg EI SA configu ration fi le for the AHA-1 740A/1 742A/1 74 4 !a dp0001 .cfg EIS A configuration fi le for the AHA-1740A !a dp000[...]

  • Page 19

    BIOS Operat ion Mode s The AHA-1740A/1742A/1744 h as two modes of opera tion: stand- ard mo de and enhan c ed mo de. Th e stan dard mo de i s software compatible with t he AHA-1540 ser ies host adapter drivers. T he enh anc ed mode uses an advanc ed, high p e rfor mance mailbox interf ace and feature s f ull EISA 32-bit addres si ng . The AHA-1740A[...]

  • Page 20

    System Cac hing Descript ion The AHA-1740A/1742A/1744 fully suppor ts operating systems cach in g to maximize overall system per for man ce. Havin g RAM on the host adapter can actu ally dec rease ov er all system perfo rm- ance while addin g c ost . Ope rating systems s uch as Nove ll ® Net- Ware, OS/2 ® , UNIX, XENI X, DO S and Win dow s  ha[...]

  • Page 21

    Product Specific at ions The followin g table lists some o f the physic al produc t descr iptions relating to the AHA-1740A/ 1742A/1744 Host Ad apter s. Phys i cal D imensions Length 13-3/8 inches Width 5/8 inch Height 5 inches Standard EISA-compati ble form fa ctor Power Requir ements + 5.0 +/- 0.2 5 Volts a t 2.9 Amps (ma ximu m) Environmental Re[...]

  • Page 22

    As sociat ed Documenta tio n The follow ing do c umen tation is also available f o r th e AHA-1740A/1742A/ 1744: • I nst alla ti o n G u i d e This in cludes basic installation infor mation in this boo k - let. T he d ownlo ad utility adl.exe is also describe d. • Technica l Refere nce Ma nual It inclu des a detailed descr iption of the host ad[...]

  • Page 23

    Chapter Two Hardware Ins tallatio n Unp ac king a nd I n spect ion The carr ier is respon sible for damage incur red durin g shipmen t. In case of damag e, have the car r ier note the damage on both the deliver y rec eip t and the freig ht bill, then no tify you r freig ht com- pany repr esen tative so t hat the necessary i nsur an ce claims c an b[...]

  • Page 24

    Prep arat ion The configuration o ptions for the AHA-1740A/1742A/1744 can be selected fr om softwar e. Ther efor e, jumper s do not need to be checked before installing the AHA-1740A/1742A/1744 into the EISA sys t em. One exception is the AHA-1742A, sinc e it con tains an on-boar d floppy con tro ller. The on-boar d flop py con tro ller is shippe d[...]

  • Page 25

    SCSI Terminato rs The SCSI bus must be terminated co rrec tly to e nsur e proper op- eration . Only the first and last device on the SCSI bus (cable ) should have the t ermin atin g resistors installed. All other SCSI devic es shou ld have the termin a ting resistor s removed. T he fol- lowin g figure shows two e xample s of SCSI device con nection[...]

  • Page 26

    The RN5, RN6 and RN7 termin ators on t he AHA-1740A/1742A are 150 ohm termin ator s. The RN2, RN4, and RN5 terminator s on the AHA-1744 are 330 ohm terminator s. I f the termin ators are removed and installed a gain in the AHA-1744, be sure t o put the 8-pin ter minator s in the 8-pin sockets an d the 10-pin termin a- tor s in th e 10-pin socke t s[...]

  • Page 27

    Ph ysical Insta llat ion in t he S ystem The follow ing steps shou ld be follow ed to install the AHA-1740A/1742A/ 1744 into the s ystem: 1. Tur n OFF the power to the comp uter system. 2. Remove the system cover accor din g to the dir ec tions of the c omputer manu factur er. 3. If only an exter nal SCSI subsy stem is used, no intern al ca- bling [...]

  • Page 28

    6. The 50-pin SCSI ribbon cable can now be attached to each SCSI device. Refer to the device’s installation instru c- tions to ensu re pro per p in 1 orie ntation . Pin 1 orie ntation must be consistent t hroughout the system. K eep t he rib- bon cable neatly dr essed away from the ventilation slots in the computer system. Kee p the ribbo n cable[...]

  • Page 29

    Chapter Four Multiple Host Adapter Support The AHA-1740A/1742A/1744 sup port s more than one host adapter in the system. T he max imum n umber of h ost adapters suppor ted depe nd s o n the operatin g mode of t he host adapter . Stand ard Mod e An EISA system can suppo rt up to a maximum of four AHA- 1740A/1742A/1744 adapter s in standard mode; lim[...]

  • Page 30

    Stand ard and Enhanced Modes In gener al, the host ad apter SCSI I D doe s not need to be ch anged from the default of 7. Even if t wo host adapters are installed i n the same co mpu ter, each wo uld hav e its own SCSI bus (cable), and th us each host adap te r w o uld still be set to SC S I ID 7. This valu e s hou ld only be chan ged if more than [...]

  • Page 31

    Chapter Five Adaptec D ownlo ad Utility The Adaptec Down load utility (ADL ) is used to download a differ - ent v ersion of the mic rocode software to the AH A-1744. T his chap t er desc ribes the o pe ration of t he pro gram which affec t s on ly the AHA-1744; the AHA-1740A/1742A do not suppor t micr ocode repr og ramming . Althou gh thi s guid e [...]

  • Page 32

    Also ensu re that the follow in g mic roco de files are presen t. • standard.hex Standar d mode micro code • enhanced.hex Enhan c ed mode mic ro code To run the progr am, type adl . The fi rst scre en displays. If the prog r am does not pr operly di splay on a monoc h rome or VGA mon itor, you can type: adl /m or adl /mono to r un th e pro g ra[...]

  • Page 33

    The installed host adapters are displayed. In this e xample , one AHA-1744 is installed in slot 3. It is curre ntly set t o e nh ance d mode. Both standar d mode and enh an ced mode fir mwar e can be downloade d, regard less of th e current operation mode of the AHA-1744. Select th e desire d host adapter and pr ess En ter . Th e Main Menu display [...]

  • Page 34

    Download Firmware After sele cting D own lo a d Fir mw a re , the next s creen display s. Ente r the filename of th e microc ode tha t you a re g oing to do wn- load to the host adapter. Enter standard. hex for standar d mode an d enhanced.hex for enhan c ed mode . The Mode field mus t be set to s tandar d to download the standar d mode micr ocod e[...]

  • Page 35

    After e nterin g the f ilename, press th e Esc k e y. T he ne xt s cre e n displays. The chec k sum of the micro co de is displayed, wh ic h uniqu ely iden - tifies the microc od e. Select Y to contin ue with the downlo ad, or N to stop. The down load can take up to 45 seconds to complete. Once completed , the s cree n displays the Download Complet[...]

  • Page 36

    Firm ware I nformati on This menu option is used to di splay infor mation on the installed firmw are. If the AH A-1740A/ 1742A1744 is operating in the stand - ard mo de, only info rmation on the standar d mode firmwar e is dis- played. If the AHA-1740A/1742A/1744 is operatin g in the enh anced mode, only i nfor mation on the enh an ced mode fir mwa[...]

  • Page 37

    Low- Level F orma t This optio n is used to low-le vel format, verify , or erase the boot sector of att ach ed SCSI f ixed disks o n the AHA-1740A/1742A/ 1744. When selected , all attached SCSI device s are d isplaye d. Select a devic e and press the En te r key. Figure 5-6. Low-Leve l Forma t Device Sele cti on Scree n EISA -t o-Fast SC SI Ho st A[...]

  • Page 38

    Th e Low- Lev el Fo rma t Opt ion s sc reen displays. Selecting Fo rmat/Ver ify ca uses th e AHA-1740A/ 1742A/1744 t o send a SCSI F ormat Unit comman d to the selec ted di sk driv e whic h per forms a low-lev el for mat of t he di sk. Whe n the SCSI Format Unit comman d is complete, t he SCSI Verif y comman d is sent to ver ify the data on the med[...]

  • Page 39

    Exiting the ADL Program To ex it the adl prog ram, p re ss the Es c key a nd the following scree n displays. Select Yes to exi t . ❐ Fi gure 5-8. Ex itin g the AD L Prog ra m EISA -t o-Fast SC SI Ho st Adapt er Adap te c Dow nlo ad Utilit y 5-9[...]

  • Page 40

    [...]

  • Page 41

    Chapter Six Host Adapter BI OS Operation The AHA-1740A/1742A/1744 BIO S oper ates in two modes: s t and- ard and enh anced . The mode of operation is selected wi th t he use of the EISA Configur ation utility sup plied wi th y ou EISA com- puter s ystem. Stand ard Mod e Operat ion When t he adapter BIOS is operatin g in the standar d mode, only SC [...]

  • Page 42

    The BIOS version and operation mode of the AHA- 1740A/1742A/1744 appear at t he top of t he message, followed b y a list of the identified SCSI devices. In the e xample show n, a SCSI f ixed disk was found at SCSI I D 0 and in stalled a s drive C . No S CSI fi xed disks were fou nd at SCSI ID 1. D rive C is also refe rr ed to a s driv e 80h with an[...]

  • Page 43

    Enha nced M ode Ope ration The enhanc ed mode opera t ion enables the adapter BIOS to iden- tify all installed fixed disks with a valid SCSI I D. All SCSI I Ds with the BIOS suppor t option enabled , using the EISA Configuration utility, are s can ned. T he devices are scann ed, starting fro m SCSI ID 0 and increasin g un til two SCSI fixed disks a[...]

  • Page 44

    If Erro r if Device Not Found is enable d, throug h the EISA Con- figu ration utility , then you will see a screen similar to the one shown below : By de faul t , remo vable media disk d riv es are not in st alled by t he adapter BIO S. To have removable media in stalled by the adapter BIO S, selec t the fr option from the EISA Con fig ur a tion ut[...]

  • Page 45

    Chapter Seven Troubleshooting The AHA-1740A/1742A/1744 execu tes a self-test diagnostics whe n the s ystem power is t urn ed on or after a Hard Reset. The self-test diagn ostics tests t he CPU operation , per fo rms a c hec k- sum test on the EPROM an d chec ks the data tran sfer paths on the host adapter. T he host system diagnostic s may perfor m[...]

  • Page 46

    The follow in g table lists the LED flash cod es with the associ ated failur e description s. Flash Code Fai lure Description LED Remains On Host Adapter Control Pro cessor f ailu re. Termi nators inope rative, missing or not powered-on or the card enabl e h as not been asserted after reset. 1 fla sh RAM test fa iled. 2 flashes AIC-62 51 SCSI proto[...]

  • Page 47

    • LED on host adapter after powe r-on - The LED o n the AHA-1740A/1742A/ 1744 shou ld come on briefly after turn- in g the sys te m powe r on . The LED shou ld tur n off when a reque st is sent to the host adapter . • LED o n ho st adapter during o peration - If the LE D on t he AHA-1740A/1742A/ 1744 is always on, the o rien tation of the SCSI [...]

  • Page 48

    Problems Booting the System f rom a SC SI Drive • Make sur e that both s tandar d fixed disks are mapped ou t of the sy stem . • Make sur e that the SCSI boot driv e addre ss is set to SCSI ID 0:0. Check the drive ins tallation manual for i nfo rma- tion about setting the SCSI ID for that device. The Retur n Installed Devic es utility in the On[...]

  • Page 49

    • Make sur e that the SC SI driv e to be used as drive D is se t to SCSI ID 0:0. Chec k the drive manu al for information on setting the SCSI ID for that d evic e. The Retur n In- stalled Devices utility i n the Onboard utilities can also be used to determin e the SCSI addr es ses of peripher als on the SCSI bus. • Make sur e that SCSI parity i[...]

  • Page 50

    • Pow er shou ld be cyc led O FF and ON afte r chan gin g an y valu es on a h ost adapter, setup prog ram, or SC SI devic e to be sure that the new initial values are loaded. • Make sur e that SCSI parity is con si stently enabled or dis- abled on all devices on the SCSI bus. • Verify t hat the host adapter and the SCSI devices are prop erly [...]

  • Page 51

    Appendix A Disk Driv es Over 1 Gigabyte Exte nded Tra nsla tion (Using DOS 5 ) Adaptec ho st adapters hav e alway s suppor ted the full rang e of disk driv e sizes u nde r all major oper ating systems. As disk drive s have rec en tly gro wn bey ond 1 Gigaby te in formatted cap acity , they have run up again s t the DOS 1024 cy lin der limit. To con[...]

  • Page 52

    When t o Use E xt ende d Tran slatio n With DOS Version 5 Only NetWare 38 6  and the newer ver sion s of UNIX do not share the 1024 cylin der limit of DOS and do n ot requ ir e exten de d tran sla- tion to supp ort large disk d riv es. O S/2 does not cu rr ently supp ort exten ded tran slation . Drives Wit h M ixed Partit ions Do not use ex ten [...]

  • Page 53

    Using Fdisk To install a new disk, or to re-partition an existing disk, use the fdisk DO S utility as y ou nor mally wou ld. The cylin der size in- crea ses to 8 MBytes w hen you enable extended translat ion. The size of the partition you reque st must t heref or e be a multiple of 8 MBy tes. If you reque st a partition size that is not a multiple [...]

  • Page 54

    Wh at if I use olde r ve rsi ons of softwa re dri ve rs wi th ex - t e nd e d t ran s lat io n en ab le d ? To pr otect your data, th e host ad apter will lock out a n y dr iver that does not identify itself as capable of exten ded tran slation. If you need to use software t ha t is not comp atible with ex ten ded translation , do not enable extend[...]

  • Page 55

    Appendix B Loading the I/O Ope rating Env ironment S oftw are DOS/Window s Under DO S 5.0 or higher , up to seven SCSI fixe d disk drives can be connected to the 1740A/1742A/ 1744 witho ut additional soft- ware . (Olde r versions of DOS suppo rt up to t wo disk driv es). The host adapter treats remov able media driv es as fixe d disk driv es prov i[...]

  • Page 56

    Nov ell Ne tWare NetWare 4.x inclu des the Adaptec I/O Ope ratin g Enviro nme nt and does not re quir e additional so ftwar e. To load software f or Novell NetWar e 286 2.x and 386 3.x follow the instruc tions included in the ASW-1440 softwar e packag e. OS/2 IBM ® OS/2 2.0 an d Micr osoft ® OS/2 1.30.1 inc lu de the Adaptec I/ O Oper ating Envir[...]

  • Page 57

    Gloss ary Adap ter Co mmand A comman d transmitted to the host adapter usi ng the Command Da ta Out P ort and the Data In Port. The command s are sequen ced using the Control Port, the S tatus Port, and t he Inter- rup t Flag Por t. Abbreviated as IOCP comman d. AE N See Async hron ous Even t Notification AHA -1540 Adaptec host adapter for conn ect[...]

  • Page 58

    ra te and ind epen de nce of ex ter nal timing constr aints, in clu din g cable le n gth and cir c uit respon se times. A sy nc h ron ou s Ev en t N ot if ica ti on A proce ss by which a target can send un solicited sense info rma- tion to an ini tiator using the Send comman d in o rder to i nform the initiator about the occur rence of an importan [...]

  • Page 59

    Commo n Co mmand Set A de facto s tandar d SC SI comman d set for commun ic ation with fixed disk dr iv es. The Common Command Set (CCS) is the basis for the SCSI-2 comman d set for all types of periph er al device s. Co nf i gur at ion The oper ation of config u ring a devic e on the EISA bus through acce ss of register s in the devic e by the hos[...]

  • Page 60

    Rec onn ect is the f u nction tha t occ urs w hen a target s elec t s an ini tiator to con tinu e an opera tion after a discon ne ct. EEPRO M Electric ally -Er asable Programmable Read O nly Memor y. An inte- grated cir cuit used to store the hos t adapter fir mwar e, wh ic h allows both mode dow n load and fi rmw ar e upgr ade while in- circ ui t.[...]

  • Page 61

    Ho st Ad ap t er A har dw are printed c ircu it board that installs in a standar d micro co mpu ter backplan e an d provid es a SCSI bus connection so that SCSI devices can be conn ec ted to the micr ocompu ter . A ho st adapter i s inte ll igen t if it has a simple hig h -lev el so ftwar e inte r- face to the microc omputer . A host adapter is dum[...]

  • Page 62

    Ma ilbo x I n An area in main memory a ssigned by the host micr ocompu ter soft- ware f or commu ni cation w ith th e host adapter . Th e host ad apter places status and pointer inf orm ation in e ntr ies in the Mailbox In (MBI) to indic ate to the host micr ocompu ter what oper ations hav e been co mpleted or wh at information must be obtained fro[...]

  • Page 63

    RAM Random Acc ess Memo ry. Memor y of wh ic h any byte can be acce ssed direc tly in a single memor y cy c le. Infor mation can be read fr om and written to the memory. Sca tte r/ Ga th er A device driv er featur e that allows the host adapter to modify the transfer data pointer so that a single host ad apter transfe r can transfer t o man y segme[...]

  • Page 64

    Sta nda rd Mo de The oper ation mode that allows softwar e written for the AHA- 1540/1640 family to be fully compatible with the AHA-1740A/ 1742A/1744. T h e limitation is that you cann ot select addresses beyo nd 16 MBytes or access several EISA register s. Synch ro nou s Data Tra nsfer A method of data tran sfer on the SCSI bu s involv ing c lock[...]

  • Page 65

    Index A Active ter minator 1-2 Address prio rity 3 -8 ADL pr og ra m exit ing 5-9 adl.ex e 1-1, 1-3, 3-9, 5-1 AMI configur ation utility 3-1 ASW-C174 1-1, 1-4 ASW-M174 1-1, 1-4 B BIOS add ress selec tion 3-8 BIOS limitation s 3- 9 BIOS op eration 6- 1, 6 -3 BIOS suppor t 3-16 Boot erro rs 7-4 Boot screen 6-3 Bus M as ter 1-1 Bus mast eri ng 1-1 Bus[...]

  • Page 66

    Dis k dri ves standar d 3-9 DMA See D irect M emory Acce ss DMA c han n el selec tio n 3-7 Dow nlo ad utility 1-4, 5- 1 See ad l.exe Dow nlo ad utility prog r am s 5-1 E EISA configu ra tion utility 1-4, 3-1 selec t ions 3-3 Enhan ced mode 3-4, 3-11, 3-15 BIOS ope ration 6-3 BIOS support 3-16 disconnect/rec onnec t 3-18 host adapter s uppo rt 4-1 m[...]

  • Page 67

    I I/O ports addresses 3-6 Ins t allation erro rs 7-3 IRQ sele ction 3-4 J Jumper s 1-3, 2-2, 2-4 L LED indic ation 7-1 Low-le vel formattin g 1-3, 3-9, 5-7 M MC S config uration utility 3-1 Micr ocod e filen ame 5-5 Multiple host adapters 4-1 N Non-SCSI d ri ve s installation e rr ors 7-5 O Operation mode 1-2, 1-5 Ove rlay files 1-4, 3-1 P Par ity [...]

  • Page 68

    R Reliability information 1-7 Removable dr ives 3-16 S Scatter/gath e r 1-2 SCS I compatibilit y 1-2 termin ator s 2-3 SCSI bus reset 3-10 SCSI devi ce configuration 3-12 SC SI devic e identific ation 6-2 SCSI ID 6-1 SCS I I D s el e ct i on 3 -10 Single en ded device 1-1 Standard mode 3-13 BIOS ope ration 6-1 disconnect/rec onnec t 3-14 host adapt[...]