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~ tI® XII User's Guide for A/UX® 030-1732-A • APPLE COMPUTER, INC. © 1990, Apple Computer, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, mechanical, electronic, photocopying, recording, or otherwise, without prior written permission of Apple Computer, Inc. Printed in the United States of America. The Apple logo is a registered trademark of Apple Computer, Inc. Use of the "keyboard" logo (OptionShift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. Apple Computer, Inc. 20525 Mariani Ave. Cupertino, California 95014 408-996-1010 Apple, the Apple logo, A/UX, LaserWriter, and Macintosh are registered trademarks of Apple Computer, Inc. Finder and MacX are trademarks of Apple Computer, Inc. DEC, VAX, and VTl02 are trademarks of Digital Equipment Corporation. ITC Garamond and ITC Zapf Dingbats are registered trademarks of International Typeface Corporation. MacDraw and MacPaint are registered trademarks of Claris Corporation. Microsoft is a registered trademark of Microsoft Corporation. NuBus is a trademark of Texas Instruments, Inc. 030-1732-A POSTSCRIPT is a registered trademark, and Illustrator is a trademark, of Adobe Systems, Incorporated. Tektronix is a registered trademark of Tektronix, Inc. UNIX is a registered trademark of AT&T Information Systems. Varityper is a registered trademark of Varityper, Inc. X Window System is a trademark of Massachusetts Institute of Technology (MIT). Simultaneously published in the United States and Canada. LIMITED WARRANTY ON MEDIA AND REPLACEMENT If you discover physical defects in the manual or in the media on which a software product is distributed, Apple will replace the media or manual at no charge to you provided you return the item to be replaced with proof of purchase to Apple or an authorized Apple dealer during the 90-day period after you purchased the software. In addition, Apple will replace damaged software media and manuals for as long as the software product is included in Apple's Media Exchange Program. While not an upgrade or update method, this program offers additional protection for up to two years or more from the date of your original purchase. See your authorized Apple dealer for program coverage and details. In some countries the replacement period may be different; check with your authorized Apple dealer. ALL IMPLIED WARRANTIES ON THIS MANUAL, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO NINETY (90) DAYS FROM mE DATE OF mE ORIGINAL RETAIL PURCHASE OF THIS PRODUCT. Even though Apple has reviewed this manual, APPLE MAKES NO WARRANTY OR REPRESENTATION, EITHER EXPRESS OR IMPLIED, WITH RESPECT TO TIDS MANUAL, ITS QUALITY, ACCURACY, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE. AS A RESU…

A/UX®System Administrator's Reference Sections 1M, 7, and 8 .® A/UX® System Administrator's Reference Sections 1M, 7, and 8 030-0779 • APPLE COMPUTER, INC. © 1990, Apple Computer, Inc., and UniSoft Corporation. All rights reserved. Portions of this document have been previously copyrighted by AT&T Information Systems and the Regents of the University of California, and are reproduced with permission. Under the copyright laws, this manual may not be copied, in whole or part, without the written consent of Apple or UniSoft. The same proprietary and copyright notices must be afftxed to any permitted copies as were afftxed to the original. Under the law, copying includes translating into another language or format. The Apple logo is a registered trademark of Apple Computer, Inc. Use of the "keyboard" Apple logo (Option-Shift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. Apple Computer, Inc. 20525 Mariani Ave. Cupertino, California 95014 (408) 996-1010 Apple, the Apple logo, A/UX, ImageWriter, LaserWriter, and Macintosh are registered trademarks of Apple Computer, Inc. B-NET is a registered trademark of UniSoft Corporation. DEC is a trademark of Digital Equipment Corporation. Diablo and Ethernet are registered trademarks of Xerox Corporation. Hewlett-Packard 2631 is a trademark of Hewlett-Packard. 030-0779 MacPaint is a registered trademark of Claris Corporation. POSTSCRIPT is a registered trademark, and TRANSCRIPT is a trademark, of Adobe Systems, Incorporated. UNIX is a registered trademark of AT&T Information Systems. Simultaneously published in the United States and Canada. LIMITED WARRAN1Y ON MEDIA AND REPLACEMENT If you discover physical defects in the manual or in the media on which a software product is distributed, Apple will replace the media or manual at no charge to you provided you return the item to be replaced with proof of purchase to Apple or an authorized Apple dealer during the 90-day period after you purchased the software. In addition, Apple will replace damaged software media and manuals for as long as the software product is included in Apple's Media Exchange Program. While not an upgrade or update method, this program offers additional protection for up to two years or more from the date of your original purchase. See your authorized Apple dealer for program coverage and details. In some countries the replacement period may be different, check with your authorized Apple dealer. All IMPLIED WARRANTIES ON THIS MANUAL, INCLUDING IMPLIED WARRANTIES OF MERCHANTABIIJTY AND FITNESS FOR A PARTICULAR PURPOSE, ARE UMITED IN DURATION TO NINETY (90) DAYS FROM THE DATE OF THE ORIGINAL RETAIL PURCHASE OF THIS PRODUCT. Even though Apple has reviewed this manual, APPLE MAKES NO WARRANlY OR REPRESENTATION, ErrHER EXPRESS OR IMPLIED, WITH RESPECT TO THIS MANUAL, ITS QUALITY, ACCURACY, MERCHANTABIIJTY, OR FITNES…

APPLE-l CASSETTE INTERFACE INTRODUCTION The Apple Cassette Interface (ACI) is a peripheral device for the Apple Computer which enables the user to store and retrieve information (data and programs) using a standard audio grade cassette recorder. The ACI attaches directly to the Apple Computer and jacks are provided on the ACI board to connect to the cassette recorder. The ACI reads and writes data at the rate of approximately 1500 baud (depending upon the data). All the ACI timing is done in software, resulting in extreme accuracy, no adjustments, and consistency between units. resulting in the inability to accurately read a tape that has been recorded on a different machine. However, if the same unit is used for both recording and reading, even the cheapest of cassette recorders will work reliably. Most tapes available in the $2-$4 category work well for data storage. You may experience an occasional tape which 'loses bits,' which is caused by severe oxide thickness variations on the tape and cannot be corrected. Special leaderless tapes need not be used as the ACI automatically transmits a ten second 'header' of all ones before transmitting the data, which insures that the leader will have passed. T APE RECORDERS & TAPE JUMPERS Almost any cassette recorder will work well with the ACI. As a recommendation, we have found the least expensive (under $40) Panasonic to be very reliable and of good quality, although it is not equipped with a tape counter, which is useful (though not essential) for locating files within a tape. (An alternative method of discerning files is to record a voice identification between files. ) Among the 'under $25' cassette recorders there may be variations in head alignment and internal electronics, For operation of the ACI, a permanent jumper must be placed between 'R' and 'C' in the block select area of the main board (B9,10). This jumper from 'R,' which is connected to enable the ACI, to 'C' selects the ACI when the 12th 4K block eC') is addressed. Also, for running Apple Basic in the 2nd 4K bank of on-board memory, it is necessary to break the solder jumper between 'w' and '1' and then jumper 'w' to 'E.' This moves the 2nd 4K bank from the 'I' block to the 'E' block, which is where Apple Basic resides. INST ALLATION Install the ACI board into the connector on the main board with the components on the ACI board facing away from the main board (the jacks to the edge of the main board). SEE FIGURE 1. The system power should be OFF whenever installing or removing the ACI board. Install cables from the ACI jack marked "TO TAPE" to the recorder microphone input and from the ACI jack marked "FROM TAPE" to the recorder earphone output. One cable can be appropriately switched between the two paths if necessary. INSTALLATION DIAGRAM USING THE ACI The Cassette program is contained in two PROMS on the ACI board and runs at ClO~. When entered, the program should echo an "*." The format for specifying the memory address ra…

— NOTE: uniess ornenwise srecine> A [_bos7] INITIAL RELEASE = THERWISE SPECIFIED 8| _[eveolsneer r-appe cuot cues fee 1. ALL RESISTORS VALUE ARE IN OHMS. DEVICE NAME +5V |GND|PG*| nat ethos ee Ya WATT £ 5% 74Ls00__|u7c.60,5F |14 | 7 bys DeSIGNATORS ¢ SIONAL le 2. ALL CAPACITORS ARE IN MICROFARADS THLSOU ule 25 NAMES. TYLSO8 UA 5 |Jc |woferse] steer y= oye was [ a) JislOb, 2-3C WAS 2-20, 7HLSII rr 3 Cen Whe 38, ‘TY WAS T3, PIN I5(USO) WAS PIN I, cite uct 35 ADDED FPI-5 TO USD, 7HLS32 UIA 24 ADDED PIN II 70 USD THALS32 U20 241|p[2e/amel sheet 2- switcHED pin fe [4e NUMBERS 2¢3 AND THUR uote uz Es ‘TRACES ON U28. 74S86 UuD 1417 [251 2B SHEET 3- 341-0175 WAS USA,28,38 374-0070, 341-0176 WAS — musios — |UeSFB Ole | 8 us 341-0071, e| enol sveere- uz Pm > was [fre = 7HSI32 ve [4 [7 las BEET Boas PIM 8 Tory 806 74S138 vin [te] 8 [2 PIN 1D, 1S NOW VIB SPIO 808. PIN 6; REFERENCE a Derry 7ULSI38 VISE 5 REMOVED FROM UIB. enn Z74LSI39 UME 5 PIN 2 1/0 SELEC S$ aS 30 SHEETS 425 - MADE vot T4LSI4B Ul2F 3 MINOR CLARIFICATION io DGNO. U6E,7E CORRECTIONS THLSI53, a 4 aa c +5 Lei F /4D |/BI61 | SH3-CB8 WAS 1.0 2 a 42 STEW 20 52D) TALSISE anid 3 WTA TBA |ezoe] shi R19 was RUT, i fee 7 3-1C.4-20. 5-40) 7TYLSIGS U7F,8F 5 ES a as Bie STATE H2-ADDED Ri roe — 74Si69 vic _fie[a [2 5c) SHS-ADDED RIS aC i UTI PIN'3 wat Ad TYHLS244 pees 20] 10] 3 CONNECTED TO GND, RESISTOR PACKS RPI,RP2 Coeaue, ISE,SF UF 20} 19 [34 74LS259 UYE 16] 8/5 SPARE GATES 7uis260_|vac,uso_ |i | 7 2 5 2 74LS279 USC ie |e | 3 fio) uae iD L 7 74F283 | u8B8,98,108| 16 | 6 | 4 TC | a maison [8 TT fs MDL U6B,IIC,70, “HAS UA ,11C,70) nee 7HLS374 | io ie 13e| 2? | 9 [34 . MOS (3A, 5 UA. 7uis303_[u7eseer [4 [7 [5 B 5 cand ed erry CEES 7uarsioo2 [vea.use [i | 7 [25 Us 8 MDIT 68000 UBA_[MNae59-3 MOIS (-aae=ua) Rom seriall vec | 20/0] 5 }uolS_ Gua Sua) T4FI9 usa [ia | 7 [23 Cl-7,10-18, 20,22-39,41 Pano : nai [usaoawe [ie [9 | 4 cl 9A ye ferrari ronal | uno _[z0[[ BEvice| cast useD | wor seb nono | umo [eal w [a eral sica Gs 556 use lw[7 [3 T= 18 )BAZ_| 99 o | a | —— = 5 sr vec alee = SO AIT =e a is ole MREAD — 310 rr *2 Gone ee 199 OS IMETRICT @gappia computar inc. 10 re | ree | —— SYNC am ae sw = mgeeore wean | 4 tu = F222) = TE =, SEES eee Y [| = +5 on SCHEMATIC , os [of —— ie ee tiga L _ fewaatenl”— [bo] 050-4009-4 | YS

I -® A/UX® Installation Guide 030-07S4-A " APPLE COMPUTER, INC. © 1990, Apple Computer, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, mechanical, electronic, photocopying, recording, or otherwise, without prior written permission of Apple Computer, Inc. Printed in the United States of America. The Apple logo is a registered trademark of Apple Computer, Inc. Use of the "keyboard" logo (OptionShift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. Apple Computer, Inc. 20525 Mariani Ave. Cupertino, California 95014 (408) 996-1010 Apple, the Apple logo, A!UX, MultiFinder, AppleCD SC, LaserWriter, and Macintosh are registered trademarks of Apple Computer, Inc. Apple Desktop Bus and Finder are trademarks of Apple Computer, Inc. Ethernet is a registered trademark of Xerox Corporation. ITC Zapf Dingbats is a registered trademark of International Typeface Corporation. Linotype is a registered trademark of Linotype AG. POSTSCRIPT is a registered trademark of Adobe Systems, Incorporated. UNIX is a registered trademark of AT&T Information Systems. 030-0754-A Simultaneously published in the United States and Canada. LIMITED WARRANTY ON MEDIA AND REPLACEMENT If you discover physical defects in the manual or in the media on which a software product is distributed, Apple will replace the media or manual at no charge to you provided you return the item to be replaced with proof of purchase to Apple or an authorized Apple dealer during the 90-day period after you purchased the software. In addition, Apple will replace damaged software media and manuals for as long as the software product is included in Apple's Media Exchange Program. While not an upgrade or update method, this program offers additional protection for up to two years or more from the date of your original purchase. See your authorized Apple dealer for program coverage and details. In some countries the replacement period may be different; check with your authorized Apple dealer. ALL IMPLIED WARRANTIES ON THIS MANUAL, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO NINETY (90) DAYS FROM mE DATE OF mE ORIGINAL RETAIL PURCHASE OF THIS PRODUCT. Even though Apple has reviewed this manual, APPLE MAKES NO WARRANTY OR REPRESENTATION, EImER EXPRESS OR IMPLIED, WIm RESPECT TO mls MANUAL, ITS QUALITY, ACCURACY, MERCHANTABILITY, OR FITNESS FOR A PARTICULAR PURPOSE. AS A RESULT,mISMANUALISSOLD "AS IS," AND YOU, mE PURCHASER, ARE ASSUMING mE ENTIRE RISK AS TO ITS QUALITY AND ACCURACY. IN NO EVENT WILL APPLE BE LIABLE FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RESULTING FROM ANY DEFECT OR INACCURACY IN THIS MANUAL, even if advised of the possibility of such damages. mE WARRANTY AND REMEDIES SE…

1 2 | 3 4 5 6 | 7 8 7 ENG. REV] ZONE] CCN DESCIIPTION OF REVISION APP APPO DATE DATE 1. ALL RESISTANCE VALUFS ARF IN OHMS, 0.1 WATT, + 5%. Jt 01 3581] ENGINEERING RELEASE 2. ALL CAPACITANCE VALUES ARE IN MICROFARADS, scsi 3. ANE CRYSTAL & OSCILLATOR VALUES ARE IN HERTZ DISK_45 (14) rs ol MISK: +5 (14) DY (5) S o} a Ba {5} 40 pee (eh DBS/ {5} 0 612 bee 087/ (5) 0 Of 14 peat) J4 DISK_45 {14} otis Bevis ‘ADB ATNI(5} 0 Sl ia ACK sy 3 211° of 22 ISG/{5} ADB_GND (17) Lo o ADB_+SV/0 {17} RST/(5) 21 to Of 22 Seu 1 FDB_O{17) neo 25 fo of 24 OI {5} 2712 of 5 z 37 bo Of 26 5 DISK_45 (14) 0 OT 30 pis +814) 2 a +5V_SH Jto +5V.SH 5/0 7 ~ VERTICAL STACKING a Oo Bi SCSI a 31 32 HMMU/ {2,16} toot 2 ve oO o-— SPKR_N {12.16} 30 of4 SPKA_P (13,16) wegen 999009 BRITE_SENSE (6,16) 3-to of CFL_PWR {7,16} gesar i) Lore weruar_ 98218) aoeepnl un seu Soares #18 chia orca RXDAGF (4) 3 fo oJ TADAGE (4) ry O60 {5} BRIGHTNESS (6,16) tt to of 12 RXDA_F {4} 2TO % OF TDA F (4) DB1/{5} ROD RST (ete 3 to of 4 KBDSTOP/ HSKIAF (4) Oo © HSKoAF {4} 219 i 99 f ez )_RST/ {2,6,18) ste olté (2.16) 8 19 key ae pew 1 8 OBS {5} Z to of 18 16M_CLK {2,16} 44 UF ps TUF {5} o 2 ACK) 04-38 2 00 3,40 o KBOCLK (2,16} 087/(5} $ ; ; Lh DISP_BLANK/{6,16) 5S fo OFS FOB_F (6,17) 4 ‘AKD (6,16) 00 OISY (2,16) am = pees E BSI {5} 7 boo (o} Pars RAW (2,3,12,16} 2-10 of 38 SY8_PWRY(2,4,6,9,16,17} as 4 tf ; if Thre ports ADDAUBIO] {12.16} St to of 32 AS! (0,16) asviisy 20 RESET/(2,6,7.16} Soto of 34 ADDRUE{1] {5,12,16} 2 al nears) DEVI {9.16} +o of 38 VIA_EN {2,316}. 20 1OFY 5,16} z 38 LOW? {5,16) J3 Loris ol? 7 if @ es Anu (S) SCSI_CSI{5.16} St of 42 DACK/ {5,16} GP1BF (4) 7 SEU {5} = a eh) 43 3 ol 44 VIA_CLK {3,16} RXDB4F (4) 8 fe oo} a TXDB4F {4} MSG/{S} RST) 43 to of 46 — RXDB_F {4} zt? oF TXDB_F {4} 33 O oO 34 SCC_EN/ {5,16} 49 1° OT so VIA2_IRQ/ {2,16} HSKIBF (4} 0 © HSKOBF {4} VIA1_IRO/ {3,16} 2 10 0} 22 DRO (2.5.16) 9 10 SCO_IRC/ {5:16} Sito of 32 NMI_INZ(2,14,16} ra aes +n SYS_RST/ {2,3,5,6,0,10,12,16) 23too SND_CS/{12,16} “35V_CPU (14.16} 23-10 of 38 -4SV_CPU (14,16} ADDRUBIS] (2,3,0,12, 16} 27 to of 38 ADDARUBIS} (12,16) ADDRUBIE] (5,12,16} 22-10 of 62 -ADDRUBI7] {12.16} Wwe ADDRUB{4) (5,12,16} Sto of 82 -ADDRUBIS] (5,12, 16} JB ADDRUBIZ] {5.12.16} 0 of 4 ADDRUB/S] {12,16} 4VSH yOSey ADDRUBL11] {2,3,0, 12,16} 3-10 of £2 ADDAUBL10] {2.3,9,12,16} 4 ‘at ADDRUELIS] (2,3, 16) Zt0 of 88 -ADDRUBI12] {2.3,9,16} ie, 3 DATABI25] (2.3,5,0,12,16) oot 28 DATABI24] {2:3,5.9,12,16} DATAB{27} {2,3,5,9,12,16} 0Oo DATAB{26] {2,3,5,9,42,16} MODEM_NSV {11,1 ttoo Hz _NSV {11,16} 213 el4 MODEMCBUSW iS 1e) DATAB[29} {2.3,5,9,12.16} toot i DATABI25] {2:3,5,0,12,16} oof = RXD_MODEM {2,16} DATABLaH e121 7A or ID_CLK_START/ (2,16) RING_DETECT/(6,16} oof s MODEM {2,16} ‘AB{31] (2,3,5,0,12,16} 79 0 DATAB{30] (2,3.5,0,12,16} REFERENCE DESIGNATORS MOUEAL SOUND {leley oof DIFC MODEMGa14 +45V_CPU {1416} 0° 45V_CPU {14,16} MODEM_SND {2.9,16} oo} 12 ATS_MODEM {2.16} 82 MODEM_RESET (2.16} 0° MODEM {2.16} ° LAST USED NOT USED MODEM_I…

I PowerPC™ Microprocessor Common Hardware Reference Platform: A System Architecture Personal Use Copy - Not for Reproduction LICENSE INFORMATION To the extent that Apple Computer, Inc., International Business Machines Corporation, and Motorola, Inc. (referred to as “the creators”) own licensable copyrights in the PowerPC Microprocessor Common Hardware Reference Platform: A System Architecture (including accompanying source code samples), the creators grant you a copyright license to copy and distribute portions of this document (including accompanying source code samples) in any form, without payment to the creators, for the purpose of developing original documents, code, or equipment (except integrated circuit processors) which conform to the requirements in this document and for the purpose of using, reproducing, marketing, and distributing such code or equipment. This authorization applies to the content of this specification only and not to the referenced material. This authorization does not give you the right to copy and distribute this document in its entirety. In consideration you agree to include for each reproduction of any portion of these documents or any derivative works the copyright notice as displayed below. You are responsible for payment of any taxes, including personal property taxes, resulting from this authorization. If you fail to comply with the above terms, your authorization terminates. The creators and others may have patents or pending patent applications, or other intellectual property rights covering the subject matter described herein. This document neither grants or implies a license or immunity under any of the creators or third party patents, patent applications or other intellectual property rights other than as expressly provided in the above copyright license. The creators assume no responsibility for any infringement of third party rights resulting from your use of the subject matter disclosed in, or from the manufacturing, use, lease, or sale of products described in, this document. Licenses under utility patents of IBM® in the field of information handling systems are available on reasonable and non-discriminatory terms. IBM does not grant licenses to its appearance design patents. Direct your licensing inquiries in writing to the IBM Director of Licensing, International Business Machines Corporation, 500 Columbus Avenue, Thornwood, NY 10594. Licenses under utility patents of Apple Computer, Inc., that are necessary to implement the specification set forth in this document are available on reasonable and non-discriminatory terms. Apple Computer, Inc. does not grant licenses to its appearance design patents. Direct your licensing inquires in writing to Mac OS Licensing Department, Apple Computer, Inc., 1 Infinite Loop, MS 305-1DS, Cupertino, CA 95014. © Copyright Apple Computer, Inc., International Business Machines Corporation, Motorola, Inc. 1995. All rights reserved. Note to U.S. Government Users—Docu…

""""'' wr·,.,,, ,• 062-0267 Specltlcation, Front Desk Bus Revision B Proposal M.R. Ctark UNRELEASED I CONFIDENTIAL INTRODUCTION The Front Desk Bus is a method and protocol for interconnecting computers with human input and other devices. This specification covers the l'hyslca1,Datallnk, and Network 1ayers of the Front Desk Bus. In this specification the computer is referred to as the host. Peripherals connected to the bus are referred to as devices. The host is the undisputed bus master. It controls the flow of data by issuing Commands and it is the only device permitted to issue them. Talk is the command used for a data transaction from a device to the host. Listen is the command used for a data Lransa<.;Lluu frow lhc hu~l lu ts elev i\;~. PHYSICAL LAYER Interconnection: All devices will communicate with the host via a 3.5 mm mini phone jack, as specified in Apple Specification,T.B.D., with the following connector assignments; Tip-Power, Riu~·Data, SlceV'c-Powcr Return They will be interconnected with three conductor cables terminated with 3.5 mm mini phono plugs, as specified in Apple Specification, T.B.D. Signal Levels: Input Signals: Data: The data line will be pulled up by the host with a 10 K Ohm resistor to power. A "High" is 2.4 V minimum . A "Zero" is 0.8 V maximum . Power: The Host will supply 5.0 Vdc + 10% to the devices. The power line will be current limited by the host to prevent systems damage in the event of a Power to Power Return short. Output Signals: A "High" is the voltage on the Tip connection. Each device in the inactive or "High" state must source less than SO uA. A "Zero" is 0.4 V maximum at 1.6 mA minimum. Devices will provide current limiting on the data line to prevent damage to the device in the event of a Power to Data line short. Page 1 of 12 © Apple Computer Inc., 1985 June 13,1985 062·0267 Specification, Front Desk Bus Revision B Proposal M.R. Ctark UNRELEASED I CONFIDENTIAL Modulation: There are three f onns of modulation on the bus, Normal modulation which transmits commands and data, Hi&h Speed modulation which transmits data, and Signals which broadcast global messages such as s~rvk~ Rcquc~l auu Rt:set. Normal Modulation: An RZ code for modulation has been adopted for the Front Desk Bus. Each bit ce 11 boundary is signified by a falling edge on the bus. The period of each bit cell is the time between two falling edges on the bus. The time for a normal modulation bit cell, Teye' is 100 usec + 30%. All devices must support nonnal modulation for data transactions. The data is encoded as the ratio of low to high time of each bit cell. Thus a "O" is ~ncuc.le<l ct~ a hit cell in which thP. lnw timP. i~ 2reatcr thPtn th~ hieh t1me.. C.onver.~ely. a "l" is encoded as a bit cell in which the low time is kss than the high time. A Start is defined as a" l ".A Stop is similar to a "O", in that it has a low time of TO , but it does not have another negative edge to define the bit cell time. It is used to s…

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