Approved Agenda X3T9.2 Meeting #77 1. Opening Remarks 2. Approval of Agenda 3. Attendance and Membership 3.1 Roll Call of Members in Jeopardy 4. Approval of Minutes - June Meeting Milpitas, CA (X3T9.2/88-066) 5. Document Distribution 6. Liaison Reports 6.1 ISO 6.1.1 X3T9.2 Positions for SC-13 meeting in Tokyo October 3-6 7. Review of Old Action Items 8. Working Group and/or Project Status Reports 8.1 ESDI 8.2 Flexible Disk 8.3 SCSI General Working Group (X3T9.2/88-072) 8.3.1 OPEN Pins for Additional Terminator Power Lines (X3T9.2/88-77) 8.3.2 Power-on to Selection Time 8.4 Fiber Optic Physical Layer Study Group 8.5 Auto-configuration Specific-Subject Working Group (SSWG) (X3T9.2/88-69) 9. Old Business 9.1 Review of SCSI-2 Draft Document (X3T9.2/86-109 Rev 5) 9.1.1 Medium Changer Command Set (SCSI-2 or SCSI-3?) 9.1.2 Rotational Position Locking (SCSI-2 or SCSI-3?) 9.1.3 Should we allow more than one IDENTIFY message per connection? 9.2 Schedule for SCSI-2 9.3 AMP Action Items on SCSI-2 High Density Connector 9.4 High-density 25-mil cable impedance 10. New Business 10.1 SCSI Device Connector Orientation (X3T9.2/88-80 Rev 1) 10.2 Burndy Connector Proposal (X3T9.2/88-85 and -101) 10.3 Review of new documents 10.4 Agenda for San Jose Working Group 10.5 Terminator Power Requirements for SCSI-2 (X3T9.2/88-87) 10.6 Changes to Medium Changers (X3T9.2/88-94) 11. Review of Action Items 12. Meeting Schedule 12.1 General Working Group Schedule 13. Adjournment Draft Minutes X3T9.2 Meeting #77 1. Opening Remarks John Lohmeyer, the Chairman, called the meeting to order at 9:00 a.m., Monday August 15, 1988. He thanked Gary Robinson (in absentia) and John Morse of DEC for hosting the meeting and he also thanked Classic Conferences for arranging the meeting. As is customary, the attendees introduced themselves. A copy of the X3T9.2 membership list was circulated for attendance and corrections. Copies of the draft agenda and the recent document register were made available to all attendees. Information on X3T9.2 and Document Distribution Application forms were made available for new attendees. 2. Approval of Agenda The draft agenda was approved with the following additions: 9.4 High-density 25-mil cable impedance The connector issues were relegated to Tuesday morning. 3. Attendance and Membership The membership requirements were reviewed. The Chairman stated that since the last meeting several changes had occurred in the voting membership: Michael Wingard had replaced Dennis Krob as Amphenol's Principal member. Steve Kohalmi had left Data General Corp. and is now an Observer for Stratus Computer; Gregory Green has been named as principal for Data General. Martin Pullam had left JAE and is now with Winchester Electronics; No new Principal had been named for JAE. Steven Justiss replaced Jesse Eckelkamp as the Texas Instruments Alternate. At the meeting, Jan Dedek became a member for Ancot Corp.; Clinton Ballard and Gregory Fry became members for Ballard Synergy; Alan Ebright and Brian Irvine were re-instated as members for Laserdrive; and Dennis Trupski and Roberto Salgari became members for Olivetti. John Lohmeyer stated that the X3 Secretariat, after a long lapse, has begun to enforce the service fee portion of the membership requirements for 1988. Member organizations which have not paid their service fees by the October meeting will be terminated. The billing process was hampered by the fact that the X3 Secretariat's database had not been updated in some time. Kate McMillan of the X3 Secretariat was working on resolving these problems and John expects a final list of delinquent organizations in September. As of July 28, the following voting organizations had not paid: Amphenol; Apple Computer, Inc.; AT&T; Bear Creek Group; CPT Corp.; Fujitsu America, Inc.; Honda Connectors; IOMEGA Corp.; Kennedy Co.; Laserdrive Ltd.; Miniscribe; Mitsubishi Electronics America; NCL America; Nissei Sangyo America; Priam Corp.; Rodime, Ltd.; Siemens Information Systems; Sony Corp. of America; Standard Microsystems Corp.; U.S. Design; Wang Laboratories, Inc.; and Xebec. This list is only the Principals and Alternates who have not paid. In some cases the bills were sent to members who have been replaced. Enclosure (1) is the list of attendees at the meeting. Enclosure (2) is the X3T9.2 membership changes since the last minutes and enclosure (3) is the current X3T9.2 membership list. 3.1 Roll Call of Members in Jeopardy The Chairman stated that he had sent jeopardy letters to all representatives of the following organizations: Apple Computer, ICL, Interphase Corp., NEC, and Seagate Technology. The letters said that these organizations had failed to attend two of the last three plenary meetings and that their membership would be terminated unless they attended the August plenary meeting. Representatives were present from all of the organizations except Apple Computer. Apple Computer was changed to Observer status. 4. Approval of Minutes - June Meeting Milpitas, CA (X3T9.2/88-066) The Milpitas meeting minutes were approved as written. 5. Document Distribution The Chairman stated that the X3 Secretariat had the last mailing in the mail within three days of receiving the original from him. Furthermore, he had not received any complaints about damaged envelops. Kate McMillan is to be commended for getting the the document distribution system to work as planned and ahead of schedule. The following new documents were distributed at the meeting: Document Doc Date Author Description of Document ------------- -------- --------------- --------------------------------------- X3T9.2/88-69 8/15/88 G. Marazas Physical Architecture -- SCSI-2 Rev 1 Interface X3T9.2/88-80 8/15/88 G. Marazas SCSI Device Connector Layout Rev 1 X3T9.2/88-87 7/18/88 J. Morse TERMPWR Requirements for SCSI-2 X3T9.2/88-91 8/8/88 J. Lohmeyer Normalizing Wide Negotiation with Synchronous Negotiation X3T9.2/88-92 8/12/88 P. Nitza Auto Bus Configuration Proposal X3T9.2/88-93 8/9/88 G. Penokie SCSI-2 Proposal for Non-data Errors X3T9.2/88-94 8/12/88 R. Kato Changes to Medium Changer Command Set X3T9.2/88-95 B. Pentecost 12-byte LOG SELECT/SENSE Commands X3T9.2/88-97 8/2/88 D. Allan Comments on Autoconfiguration X3T9.2/88-98 8/5/88 D. Allan Comment on single-ended signals from Electronic Design Magazine X3T9.2/88-100 8/12/88 J. McGrath Changing SCSI IDs from non-unique ID configurations X3T9.2/88-101 8/15/88 D. Barnum Burndy proposal for a Microshield (tm) Interconnection System Enclosure (4) is the current 1988 document register. 6. Liaison Reports 6.1 ISO Gene Milligan informed the attendees that ANSI has withdrawn the RDI standard from further consideration as an international standard. ANSI has also submitted the SMD for ISO publication. Gene has received a IPI- 2 Tape document for informational submittal to ISO, a revised Tape Cartridge I/O document, and a revised Flexible Disk document. The revised documents, pending T9 approval will be submitted to ISO next week. Gene forwarded the FDDI PMD ISO document to SC13. The SC13 Secretary has requested that we negotiate the various ISO document comments directly with the commenting nations prior to the next meeting on October 3, 1988. A SC 83/WG 3 meeting is being held in Vienna during the last week of September concerning premise cabling including FDDI installations. Gene has recommended that the SC13 liaison to the meeting be selected from the European members. A proposal has been made to merge various I/O committees of SC6, SC13, and IEC (SC 6 Telecommunication & Information Exchange Between Systems/WG 3 Physical Layer; SC13 Interconnection of Equipment; IEC 47B and TC83) into a group which would maintain the same projects and the same officers. 6.1.1 X3T9.2 Positions for SC-13 meeting in Tokyo October 3-6 It was deemed premature to submit SCSI-2 Rev. 5 to SC-13 as a new work item. Courtesy copies of SCSI-2 Rev. 5 are to be given to the SC-13 meeting attendees. It may be appropriate to attempt to get a resolution accepting SCSI-2 upon its approval by X3T9. Gene Milligan moved, and Dal Allan seconded, that X3T9.2 empower the ANSI delegation to ISO JTC1/SC-13 to arrive at positions that are consistent with the present work in X3T9.2, subject to any specific directives from X3T9. The motion passed unanimously. Two documents, N438 and N445, containing editorial comments on DIS 9316 (SCSI-1) have been received and given to Bill Burr (the ISO SCSI Technical Editor) to incorporate, if possible. Bill Burr provided a draft copy of DIS 9316 for review by committee members during the meeting. He planned to complete the draft in time for the SC-13 meeting. 7. Review of Old Action Items 7.1 Dan Davies will propose revised wording in the retry counts and algorithms of REQUEST SENSE and MODE SELECT. Carried over. 7.2 Steve Goldman will draft an implementors note clarifying the differences between synchronous and wide negotiation procedures. Not completed, but 88-091 may supersede this action item. 7.3 Paul Boulay will revise the CD-ROM section of SCSI-2. Complete. Paul Boulay is now the editor for the CD-ROM and Medium Changer sections. 7.4 Steve Goldman will provide a description of the sense key, additional sense code, and additional sense code qualifier hierarchy. Complete. 7.5 John Morse will provide more a substantial justification for accepting his proposal to add more terminator power lines. Complete (see 88-77). 7.6 John Lohmeyer will send a letter to George Till and Allen Ross of Prime notifying them of the situation regarding Prime's membership. Complete -- Mike Fitzpatrick was present. 7.7 Jim Semenak will edit X3T9.2/88-049 Rev 2 into SCSI-2 Rev 5. Complete. 7.8 Bill Spence will prepare the log pages for LOG SENSE/SELECT commands. Complete. 7.9 AMP, et al., will provide drawings of a low-profile version of their connector for the committee's consideration at the next plenary. Complete. 7.10 AMP will prepare a thesis on removal forces for the high-density connectors in the absence of a retention mechanism. This paper should compare and contrast the current 50-pin design and the chip "walking out" phenomena of dip sockets. Complete. 7.11 AMP will investigate the mass termination capability of 25-mil, 28-AWG ribbon cable. Complete. 7.12 Harvey Waltersdorf will provide the UL, CSA, VDE listings and the electrical characteristics of 25-mil centerline, 28-AWG ribbon cables. Partially complete -- Harvey provided some of this information (see 9.4). The remainder is carried over. 8. Working Group and/or Project Status Reports 8.1 ESDI ESDI (BSR X3.170-198X) is currently in its first public review period which ends October 3, 1988. No formally registered comments have been received at the X3 Secretariat, but several issues have been raised including: 1) Registration authority procedure for vendor codes (88-61). 2) Revised vendor codes (88-73). 3) Correction to spindle motor control (88-74). 4) Tom Wicklund's comments (88-89). Chairman's Note: Subsequent to the meeting, the Chairman was informed that a registered comment had been received from GSA, saying the document is incomplete as several Tables and Figures were missing. Dal has been been advised of the comment. Other comments are expected from NCR and Ciprico concerning gap timing. This means X3T9.2 should expect to address these comments at the October plenary meeting. A Monday evening session (7:00 p.m.) is being planned to address these issues. 8.2 Flexible Disk There was no report. 8.3 SCSI General Working Group (X3T9.2/88-072) John Lohmeyer reported that a working group meeting was held July 11-13, 1988 in Boise, ID with 32 attendees. Dave McIntyre hosted the meeting. The working group asked that the following two items be included for plenary consideration: 8.3.1 OPEN Pins for Additional Terminator Power Lines (X3T9.2/88-77) The working group discussed this item and was generally opposed to redefining current GROUND lines as either GROUND or OPEN, with the idea that SCSI-3 may want to use these lines for additional TERMPWR lines. However, no one from DEC was present at the working group to defend the proposal. Therefore the working group requested that this item be added to the plenary agenda for resolution. Achieving sufficient voltage at end of long cables for terminator power may not be possible when starting with a 4.75 volt supply and going through a diode and a current limiting device. The interest in using a smaller wire size also suggests a need to use more lines for term power. If we intend to use more lines for terminator power in SCSI-3, then it would make sense to assign some current GROUND lines as OPEN in SCSI-2 as a migration aid. That way, SCSI-2 devices would be compatible with either SCSI-1 devices or with SCSI-3 devices on the same cable. SCSI- 1 and SCSI-3 devices could not be mixed on the same cable without an adapter. Concern has been expressed about the antenna effect of an open line. 88-77 addresses this by requiring a 10 K ohm high-impedance tie-down resistor and a subsequent DEC proposal suggests that these lines be terminated only in terminators, not in each device. Thus far, no data has been obtained concerning what termination, if any, is required on these lines. The last working group agreed to use four lines for terminator power in the B cable. Section 4.4.3 is ambiguous concerning where the 4.25 Vdc is measured. Timing measurements are specified to be at the device connector, but it is not clear whether the terminator voltage is measured at the device or at the end of the cable. John Lohmeyer stated that he believed the measurement should be made at the device connector. This topic (along with the transmission line issue -- see 9.4) was remanded to a specific-subject working group to be lead by Jeff Stai. The plenary does not expect a requirement to mix SCSI-1 and SCSI-3 devices on the same cable. 8.3.2 Power-on to Selection Time A working group discussion on the need for a specific maximum time from power-on to the time a target can accept selections resulted in general agreement that such a time is application-specific. No other agreement was reached. This item was added to the plenary agenda in hope that the plenary might succeed where the working group failed. Resolution may be necessary if auto-configuration is accepted. As might be expected, the plenary also failed to reach agreement. This aggravates the problems faced by self-configuring systems. 8.4 Fiber Optic Physical Layer Study Group [NOTE: This project is to study the support of SCSI and IPI on a fiber physical layer. The software base is to be protected.] Dal Allan chaired the second study group meeting on this topic in Sunnyvale August 11-12 at the Sunnyvale Hilton. Peter Dougherty of UNISYS hosted the meeting. The study group is in the information gathering phase. The Protocol Engine was presented, AMP presented a fiber optics primer, IBM presented the use of CD-ROM lasers to achieve higher-performance than LEDs and AT&T covered parallel fiber connector terminations. On applications, ICL presented MacroLAN, a fiber channel in which the control protocol is token, and data is broadcast as on a bus. HP presented HP-FL, a fiber optic implementation which has a copper version for internal busing. An explanation of the IEEE 802.6 activities on Wide Area Networks was made. There was a brief explanation of ParaLAN, a SCSI extender in coax or fiber. The primary holdover is a discussion on switching. On fiber there are limited passive drops and the bypasses are expensive. It is preferable to use active repeaters in switch boxes. The next meeting is September 26-27 in the San Jose area. Contact Dal Allan or the SCSI Bulletin Board for details. At the next meeting several more presentations are expected. It is interesting to note that HP and ICL both use relatively old fiber technology to keep cost down. The fiber cable costs for system implementations are low as distances are relatively short. The connector and attachment costs dominate. Roger Cummings is preparing a report on this meeting. 8.5 Auto-configuration Specific-Subject Working Group (SSWG) (X3T9.2/88-69) During the Monday session of the Boise working group meeting it was recommended that auto-configuration be placed in an SCSI-3 SSWG. This SSWG met at 8:00 on Tuesday and Wednesday mornings before the regular working group sessions. The auto-configuration SSWG focused on investigating alternate methods from the IBM proposal (88-69). The working group established a set of potential requirements for auto-configuration and sensing the correct installation of terminators (for which Jeff Stai coined the acronym, "SPASTIC" - SCSI Programmable Address Select / Terminators Installed Correctly). It is likely that no proposal will meet all of the potential requirements, but the list serves as a standard checklist. The IBM proposal was judged to miss several requirements. In fact, any proposal based on interrupting signals at each device would miss a number of these potential requirements. Most of the SSWG members felt that the auto-configuration feature should be based on using the existing 50 lines, rather than by adding lines. If such a method can be devised, it would meet most of the SPASTIC guidelines. Approaches under consideration included using an "Ethernet- like" collision detection scheme either using pseudo-random signals or analog voltage sensing. Another method discussed on the SCSI Bulletin Board includes using unique identifications (serial numbers) on each SCSI device. Another meeting of the Auto-configuration SSWG was held Monday evening August 15 at 8:00 p.m. (see X3T9.2/88-99). The Auto-configuration topic was resumed on Tuesday morning. Jerry Marazas moved, and Bill Spence seconded, that a SCSI-2 SSWG be established to study a sixty-line electronic addressing scheme. Paul Boulay proposed a friendly amendment that would direct the SSWG to investigate any alternatives that use unique cabling to achieve electronic addressing. Jerry accepted the proposed amendment, Bill did not. Bill stated that he felt the committee needed to confront the issue of whether or not the committee is willing to accept a non-fifty line solution. Gene Milligan moved and Peter Dougherty seconded, that the motion be amended to state that all auto-configuration proposals including electronic addressing be remanded to an SCSI-3 SSWG and not be considered for SCSI-2. To give plenary attendees background information, the Chair tabled the discussion of the motion and the amendment for 15 minutes to get a report from the Boise working group on the auto-configuration topic. He asked Paul Boulay to give a verbal report on Boise working group and the SSWG meetings on the topic. Paul Boulay gave an informative report and discussion returned to the amendment. The amendment passed: 39 in favor and 5 opposed. The amended motion became: "That a SCSI-3 SSWG be established to study auto-configuration/electronic addressing proposals and any forthcoming proposal not be considered for SCSI-2." The amended motion passed: 39 in favor and 6 opposed. The Chair requested Paul Boulay to lead the SSWG which will meet before and after San Jose working group sessions (see 12.1). 9. Old Business 9.1 Review of SCSI-2 Draft Document (X3T9.2/86-109 Rev 5) The editors had completed SCSI-2 revision 5 one week prior to the meeting. NCR made 100 copies of the document (now 555 pages) for the attendees of the meeting. This document will be included in the next committee mailing. Larry Lamers outlined the major differences in revision 5 from the previous revision. At the Minneapolis working group meeting several people suggested that the editors pick a better phrase than "logical thread". After consulting several Thesauruses, several dictionaries, and a published author the editors selected "nexus" as best describing the concept. The editors have also defined several other terms including: "connection", "initial connection", "reconnection", and "I_O process". All of these terms are defined in the glossary in Section 3. The editors hope the new terminology will lead to more precise and concise documentation and will aid in understanding the document. The extended messages have been merged with the other messages in Section 5. The HEAD OF QUEUE TAG, ORDERED QUEUE TAG, and UNORDERED QUEUE TAG messages have been collectively called the QUEUE TAG messages and are described together. The editors accidentally deleted the description of the RelAdr bit. It will be re-instated in revision 6. Section 9 now requires that fixed-block mode be implemented by all sequential-access devices. The section editor felt that this would make it easier to write a generic driver. The editors are soliciting any objections to this new requirement. 9.1.1 Medium Changer Command Set (SCSI-2 or SCSI-3?) Extensive editorial changes were made to the medium changer section both by John Lohmeyer and by Paul Boulay who has agreed to be the new section editor for medium changers. Much work remains to be done. The editors asked the full committee to decide whether this section should remain in SCSI-2 or be moved to SCSI-3. John Lohmeyer questioned whether there was sufficient interest in medium changers to finish this section in time for its inclusion in the forwarded document. Paul Boulay stated that he had phone conversations with Mike Rudy (the former section editor), Bart Raudebaugh, and ? Kato. He thought that there was sufficient interest to resolve the problems with the section. A SSWG on medium changers was established and will meet during the San Jose working group meeting. Paul will lead this SSWG. (Please see agenda item 10.6 for related information.) 9.1.2 Rotational Position Locking (SCSI-2 or SCSI-3?) This part of the rigid disk drive geometry parameters page still needs a lot of work. It uses undefined terms and refers to undefined signals. The editors asked the full committee to decide whether this section should remain in SCSI-2 or be moved to SCSI-3. The wording problems were remanded to Bob Mortensen for another pass at the wording and to the San Jose working group for further consideration. 9.1.3 Should we allow more than one IDENTIFY message per connection? Allowing more than one IDENTIFY message per connection was put into SCSI-1 to allow an initiator to change the DiscPriv bit as deemed necessary. Bob Snively had questioned whether anyone actually uses this "feature". If not, it should be removed from SCSI-2. Companies with three letter names, like OTL and IBM, have implemented (or are thinking about implementing) this feature and seem to want to keep it around. Robert was off in merry olde England and couldn't argue his case. It was remanded to working group. 9.2 Schedule for SCSI-2 The editor's plan is to have SCSI-2 Rev. 6 in the mailing prior to the December meeting and to have a few copies available for the November working group meeting. The November working group would be devoted to reviewing Rev. 6 and making any necessary changes so that a Rev. 7 could be forwarded in December. 9.3 AMP Action Items on SCSI-2 High Density Connector Ed Reynolds presented a set of foils on a lower profile connector. Bob Whiteman gave a presentation on mating/unmating forces test results. He stated that AMP's test results with typical cables did not show any back-out problems under 21.3 g maximum random frequency vibration. Bob Whiteman gave a presentation on mass terminated in-line connectors. 30 AWG or 28 AWG cable can be used. Details were not available because of the proprietary design being used. The technique has been done with another connector, but not yet with the SCSI-2 high density connector. Bob also presented a foil on ribbon cable electrical characteristics. Bob Herron presented foils showing a picture of the Hitachi 7-strand cable (28 AWG, 25 mil centerline) mass terminated (with a upper/lower split-out) on a 3M connector. The fixture for installing the connector does the upper/lower split-out. This is a patented concept. 9.4 High-density 25-mil cable impedance [Stai] Harry Waltersdorf gave a presentation on the electrical characteristics of flat cable (see enclosure (5)). He listed the UL numbers for fine- pitch flat ribbon cable. Most of these specify 30 volt ratings. He also stated that CSA has recently opened an avenue to qualify fine-pitch cable under CSA 210.2. The transmission-line characteristics of fine- pitch cables are cause for concern. Jeff Stai gave a presentation on inserting signals on a single-ended bus. His concern was the negative going pulses caused by reflected signals. CMOS logic fails (latch-up occurs in the chip) when inputs receive voltages more negative than 0.7 volts. His calculations show such voltages are quite likely when mismatches occur between the characteristic impedance of the cable and the terminator (see enclosure (6)). John Morse commented that cables will not behave as transmission lines if the length is less than 1/6 of the wavelength. A six-meter cable will have problems, but a short (e.g., 12-inch) cable within a box may not have a problem. Reflection problems get worse when cables are mixed (50 mil and 25 mil centerlines). Jeff Stai will lead a SSWG to study these issues during the San Jose working group meeting. The charter of this SWIG is to determine the characteristics of cables necessary to guarantee the integrity of the SCSI bus for both single-ended and differential. The charter may be expanded to deal with termination issues. 10. New Business 10.1 SCSI Device Connector Orientation (X3T9.2/88-80 Rev 1) Jerry Marazas presented a foil showing a preferred SCSI device connector layout. The difference from the previous revision shown at the Boise working group meeting was that the power connector was moved to the right side since his survey found that 90% of existing DASD product used that configuration. Two arguments were given to support the proposal, 1) it would achieve optimum cooling by the minimizing the volume occupied by the cable and 2) it would permit optimal EMC characteristics. Another obvious argument is that it simplifies adding devices in the field. Jerry favored including the proposal as an appendix. Gene Milligan moved and Bill Spence seconded that Figure 1 of Jerry Marazas' proposal, X3T9.2/88-80 Rev. 1, be included in the body of SCSI-2 with a note that "where the application does not preclude it, figure xxx shows a recommended connector orientation" and that Gerry Marazas modify the figure to be more generic in terms of power connector and box size. Jerry Marazas asked for a friendly amendment to remand it as an SCSI-2 work item to the next working group. The amended motion read as follows: That Figure 1 of Gerry Marazas proposal, X3T9.2/88-80 Rev. 1, be remanded to the working group as a work item for SCSI-2. The motion passed unanimously. 10.2 Burndy Connector Proposal (X3T9.2/88-85 and -101) David Barnum of Burndy introduced Heinz Piorunneck, who made the presentation. The presentation material was given document number X3T9.2/88-101 which details their ribbon-style connector. It was basically the same connector as proposed at the February 1988 meeting, except that more of the connector family members were shown. Bill Spence moved and Gene Milligan seconded that the connector proposal designated as X3T9.2/88-101 be accepted as a SCSI-2 work item. The motion failed: 8 in favor and 32 opposed. 10.3 Review of new documents 88-91 Normalizing Wide Negotiation with Synchronous Negotiation [Lohmeyer] John Lohmeyer introduced his document as attempting to make the wide negotiation procedure the same as the synchronous negotiation procedure. Steve Goldman did not object, but thought the synchronous negotiation procedure is overly complex. Others felt the simplicity of using the same procedure which has evolved through two years of product experience outweighs the possible simplification in procedure. It should also avoid the pitfalls that surrounded the early synchronous products. Dave McIntyre moved and Jeff Stai seconded that X3T9.2/88-91, as corrected, be accepted for SCSI-2. The motion carried: 22 in favor and 0 opposed. There was considerable discussion over whether precedence should be assigned between WDTR and SDTR negotiations. The current document requires WDTR be done prior to SDTR, but this could result in problems when one of the two devices "forgets" the agreement due to a power failure or BUS DEVICE RESET message from another initiator. Some people felt that no order should be specified. Steve Goldman argued that this could result in negotiations that would not converge. The final solution to the problem is to add a requirement that any WDTR message return the two devices to asynchronous data transfer mode. John Lohmeyer will revise section 5 to include 88-91 along with the modifications developed in the meeting. 88-93 Proposal for non-data errors [Penokie] After some discussion, George agreed to withdraw the part of the proposal dealing with the D/N bit. The attendees agreed to add HARDWARE ERROR sense key to paragraph 7 of section 7.2.15.1., permitting actual retry count information to be returned for this sense key. The discussion went off on the error recovery parameters page and discussion of the EER bit. The description of this bit needs editorial improvement. 88-095 Twelve-byte CDB's for LOG SELECT/SENSE [Pentecost]. This document proposes that 12-byte versions of the LOG SELECT and LOG SENSE commands be defined. There was a suggestion that we delete the 10-byte forms of these commands. Some people objected to the suggestion because no other 12-byte commands are needed to implement magnetic disks. The document was remanded to the working group. 88-97 Comments on Auto-configuration [Allan] This is an eloquent expression of Dal's opinion on auto-configuration. 88-98 Comment on SCSI from Electronic Design Questionnaire [Allan]. This letter from Dal includes a questionnaire that was returned to Electronic Design Magazine criticizing the single-ended signal quality. This document was remanded to transmission line SSWG. 10.4 Agenda for San Jose Working Group John Lohmeyer and Larry Lamers had put together a draft agenda for the next working group meeting. The draft agenda was further revised to create the following draft agenda: Agenda Items for SCSI-2 1. [] bracket removal 2. Review of S2R5 3. LOG SELECT/SENSE review 4. ECA via AEN Issue 5. RECONNECT QUEUE Message 6. Processor Device Model [88-064] (Stai) 7. AEN Revision [88-065R2] (Boulay) 8. Rotational Position Locking 9. Medium Changer Devices 10. SCSI Device Connector Orientation [88-80R1] (Marazas) 11. Multiple IDENTIFY messages [see 9.1] (Snively) 12. Bull's comments on single-ended [88-98] (Allan) 13. 12-byte CDB's for LOG SENSE/SELECT [88-95] (Pentecost) 14. Open pins (Bob & Ed need to come to consensus) [88-77] 15. DEC open pin and terminator power issue [88-48R1, 88-77, 88-87] Agenda Items for SCSI-3 50. SEND DIAGNOSTIC Pages [87-186] (Spence) 51. LOAD SKIP MASK command proposal [87-203] [87-217] (Floryance, McIntyre) 52. More that 8 devices on wide SCSI [87-206] (Harms) 53. Search Command modifications [88-002] (Stai) 54. Expanded RelAdr Bit Definition [88-007] (Boulay) 55. Autoconfiguration SSWG [88-69R1, 88-92, 88-100] (Marazas, Nitza, Boulay) SSWG Schedule: Monday 8:00 a.m. - 9:00 a.m. Hierarchical Filemarks (*) Monday 7:00 p.m. - ? Auto-configuration Tuesday 9:00 a.m. - noon Transmission Line issues Tuesday 7:00 p.m. - ? Auto-configuration Wednesday 8:00 a.m. - 9:00 a.m. Medium Changers Wednesday 1:00 p.m. - ? Medium Changers (*) There is a study group being formed on hierarchical filemark structures for sequential-access devices. Bill Homans is leading the group. Please contact him at 215-666-4764 for further information. 10.5 Terminator Power Requirements for SCSI-2 (X3T9.2/88-87) In this document, John Morse proposes that each device be required to supply terminator power, an issue that has been visited repeatedly in the past. Apparently, the real issue was that the draft standard is not clear enough that targets may provide terminator power (but only initiators are required to provide it). Improved wording will be incorporated in the document to more explicitly allow targets to provide terminator power. A straw poll on whether or not targets should be required to have an user selectable option to provide terminator power resulted in: 12 in favor and 21 opposed. Jerry Marazas expressed a concern that 4.75 Vdc power supplied at one end of the cable may drop to 2.6 VDC at the end of a 6 meter cable. Even without line loss, voltage after a blocking diode and a current limiting device may be 4.1 Vdc or lower. (Typical cables are 0.065 ohms/foot). This issue was remanded to the transmission line/terminator power SSWG for further study. 10.6 Changes to Medium Changers (X3T9.2/88-94) Rick Kato gave a presentation on proposed changes to medium-changer devices. There was general agreement on most of Rick's proposed changes and the proposal was remanded to a medium changer SSWG to be lead by Paul Boulay. 11. Review of Action Items 11.1 Dan Davies will propose revised wording in the retry counts and algorithms of REQUEST SENSE and MODE SELECT. 11.2 Harvey Waltersdorf will provide the UL, CSA, VDE listings and the electrical characteristics of 25-mil centerline, 28-AWG ribbon cables. 11.3 Bob Mortensen will take another pass at the wording on Rotational Position Locking and will submit it to the working group for further consideration. 11.4 Jerry Marazas will modify the connector orientation drawing to be more generic and will attempt to get it into a suitable electronic format. 11.5 John Lohmeyer will revise section 5 to include 88-91 along with the modifications developed in the meeting. 12. Meeting Schedule The next meeting of X3T9.2 will be October 10-11, 1988 at the Quality Inn - Downtown Boston (617-426-1400 FAX: 617-482-6730) hosted by Apollo Computer, Inc. Please mention "X3T9/Apollo" when making reservations to receive the special room rate of $104.00 single occupancy and $115.00 double occupancy, plus tax. The cut-off date for room reservations is September 19, 1988. The X3T9.2 plenary meeting schedule for the remainder of 1988 and 1989 is: Date Location Host -------------------- ------------------------ -------- December 5-6, 1988 San Diego, CA (*) Cipher February 20-21, 1989 Austin, TX Motorola April 24-25, 1989 St. Petersburg Beach, FL AMP June 19-20, 1989 ? ? August 21-22, 1989 ? ? October 16-17, 1989 ? ? December 4-5, 1989 ? ? (*) At the meeting, it was stated that this meeting was being moved to Laguna Beach. Later information is that it will remain in San Diego. 12.1 General Working Group Schedule The X3T9.2 general ad-hoc meeting schedule for the remainder of 1988 and 1989 is: Date Location Host ------------------ ------------ -------------------------- August 29-31, 1988 San Jose, CA Jim McGrath (see 88-054) November 7-9, 1988 Austin, TX Bill Spence January 9-11, 1989 Irvine, CA Jeff Stai March 6-8, 1989 ? ? {tentative date} May 8-10, 1989 ? ? {tentative date} July 10-12, 1989 ? ? {tentative date} September 6-8, 1989 ? ? {tentative date} Oct 30 - Nov 1, 1989 ? ? {tentative date} 13. Adjournment The meeting was adjourned at 4:00 p.m., Tuesday, August 16, 1988.