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character (bit positions 0 through 7) is transferred tothe common bus, and the channel address register(CAR) is not advanced. When the byte counter containsan odd count, the low order character (bitpositions 8 through 15) is transferred to the commonbus, and the CAR is advanced.In receive mode, data flow is from the communicationline to the data set, to the SERDES, to thecommon bus or eight-bit buffer register, to corestorage. The 8-bit buffer is used to pack two 8-bitcharacters into one 16-bit core storage word. Whenthe byte counter contains an even count, the eight-bitbuffer is loaded from the SERDES and the channeladdress register (CAR) is not advanced. When thebyte counter contains an odd count, the character inthe SERDES is transferred via the common bus tocore storage , along with the character in the eightbitbuffer, and the CAR is advanced.Data transfer between core storage and SERDESis parallel by byte and serial by character. Datatransfer between SERDES and the communicationsline is serial by bit.CA Transmission CodeThe CA uses either EBCDIC (Figure 93) or ASCII(Figure 94) for transmission code. Both codesutilize eight bits per character. (ASCII uses sevenbits plus a parity bit.) Because a core storage wordconsists of 16 data bits, CA characters are packedtwo characters per word in core storage; one characterin bit positions 0 through 7 and one character inbit positions 8 through 15. All characters are transmittedlow order bit first as follows:Core Storage WordBit Positions0 1 2 3 4 5 68 9 10 11 12 13 14 15EBCDIC 0 1 2 3 4 5 6 7ASCII P 7 6 5 4 3First Bit to Line111730A1Communications control characters and sequencesdefined for the BSC system are listed in Figure 95 anddescribed in the following paragraphs.SOH (Start of Heading): SOH is used as the first characterin a block of heading data in a message. A headingmay consist of a series of noncontrol characters,which may be used to process the text portion of amessage. If a heading is subdivided into shorter transmissionblocks by use of ETB or ITB, SOH is used tostart any block that continues the transmission of theheading. Use of SOH following ITB is optional, butshould be used only if the block ended by ITB washeading.STX (Start of Text): STX is used to indicate the startof the text portion of a message and to terminate aheading. Text is that portion of a message treated asan entity to be transmitted to a remote station withoutchange. If text is subdivided into shorter transmissionblocks by use of ETB, STX is also used to starteach block of text that continues transmission of thetext. Use of STX at the start of a text block followingan ITB is optional.ITB (Intermediate Transmission Block): ITB is usedto block data by indicating end of intermediate text orheading without causing line turnaround. Block checkcharacters (BCC) are immediately transmitted followingan ITB. Another message block follows the ITBand BCC. SOH or STX may be included or omitted asthe first character of the block following an ITB, providedthe type of information (heading or text) in thetwo blocks is the same. However, SOH normally doesnot follow a previous text block, only a previous headingblock.ETB (End of Transmission Block): ETB is used toindicate the end of a transmission block which is notthe end of the message. ETB is followed immediatelyby the BCC's and calls for a response from thereceiving station. After an affirmative response,transmission of the message is resumed with an SOHor STX, depending on whether the ETB came withinthe heading, between the heading and text, or withinthe text.Control CharactersTen communications control characters provide thecontrol character set to implement control functions.ETX (End of Text): ETX is used to terminate a textor message. ETX is followed immediately by theBCC's and calls for a response from the receivingstation. After an affirmative response, transmissionmay continue with SOH or STX. ETX should not beused to terminate a heading.180
Bit Positions0,1, 2,34, 5, 6, 7► 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111Hex 0 1 2 3 4 5 6 7 8 9 A B C D E F10000 0 NUL DLE• DS SP & ACK° 00001 1 ral DC1 SOS ACK1 Fl a j A J 1•0010 2 ll DC2 FS SYN F2 b k s B K S 241)0011 3 DC3 ■ F3 c I t C L T 3e0100 4 PF RES BYP PN F4 d m u D M U 44100101 5 HT NL LF RS n v E N V 5EOB•0110 6 LC BSUC 0 W 6ETBPRE0111 7 DEL ILSC EOT F7 g p x G P X 71000 8 CAN F8 h q y H Q Y 8f a w F1001 9 RLF EM • i r z I R Z 9ill1010 A SMM CC SM I LVMel ,1011 B VT CUl CU2 CU3 • $ ACK i1100 C FF IFS DC4
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File No. 1800-01Order No. GA26-5918
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ContentsINTRODUCTION 1SYSTEM DESCRI
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Thermocouple Conversion ExampleConv
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Status Character 2412790 ADAPTER PR
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Processor - ControllerCoreStorageOu
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Page of GA26-5918-8Revised July 14,
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egister or the index register speci
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Short InstructionDDOne WordInstruct
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Instruction SetThe 1800 system inst
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LOAD ACCUMULATOR (LD)FORMATS oitamw
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STORE ACCUMULATOR (STO)FORMATSF 0 O
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LOAD INDEX (LDX)0 OP F T Disp 151 0
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STORE STATUS (STS) Store Status Fun
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LOAD STATUS (LDS)117165 A1DESCRIPTI
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SUBTRACT DOUBLE (SD).fartzaielTmEas
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DIVIDE (D)FORMATS0 OP F T DispF T I
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LOGICAL EXCLUSIVE OR (EOR)'FORMATS
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SHIFT LEFT A AND Q (SLT)altkae..,.:
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SHIFT RIGHT LOGICAL A (SRA)FORMAT s
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ROTATE RIGHT A AND Q (RTE)FORMAT ta
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BRANCH OR SKIP ON CONDITION (BSC OR
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a4.-4KA4rE4.7.9.4.&.4VA/M4:14/24...
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',V.71..1.41VV4-02,P2A,V4,1%1,L—N
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COMPARE (CMP)FORMATS0 OP F T Disp 1
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MachineCyclesAUGEND (A-reg) and ADD
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chain is accomplished as follows: T
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InterruptTo allow for coordination
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After a request for service has bee
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2. The forced BSI with indirect add
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Storage ProtectionStorage protectio
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Page of GA26-5918-8Revised January
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Processor-Controller ConsoleThe pro
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117674,Figure 23. Console Pushbutto
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DATA FLOW DISPLAYSSix rows of light
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This command causes the console int
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High -LevelHigh -Level Low-LevelLow
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CUSTOM ELEMENT: This element is ava
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The clock stop period does not dire
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Numberingwithin 18511851's withMult
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selected analog signal to a digital
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0 1 2 3 4 5 8 7 0 9 10 14 15Indicat
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Direct Program Control Operations P
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Temp TempF C1652° 9001472° 81292
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2. Determine the ADC reading (Q val
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Digital InputDigital input features
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ead operation without external sync
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AdapterFirstSecondThirdFourthFifthS
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the next input group address (conta
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status word (PISW), the PISW is rea
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ProcessorControllerOut Bus(16 - Bit
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DAC reference voltage used in devel
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126 is assigned to the second group
Page 138 and 139: The input/output control command (I
Page 140 and 141: Page of GA26-5918-8Revised July 14,
Page 142 and 143: 1053/1816 Printer IOCC'sCE ModeSpec
Page 144 and 145: Keyboard entries are not printed au
Page 146 and 147: error is detected, the program may
Page 148 and 149: the keyboard into a storage-protect
Page 150 and 151: Channel••• ••••• 14
Page 152 and 153: READER ANY ERROR: This indicator tu
Page 156 and 157: Even-Numbered ColumnsOdd-Numbered C
Page 158 and 159: 1442 DSW Interrupt IndicatorsFigure
Page 160 and 161: The preceding examples show that if
Page 162 and 163: CharHexCore Storage BitsTypebar2 5
Page 166 and 167: CE PRINTER BUSY: When the 1443 is i
Page 168 and 169: DrumDownDRUM FAST RUN: This switch
Page 170 and 171: 1627 DSW Noninterrupt IndicatorsFig
Page 172 and 173: 120255A1Each track is divided into
Page 174 and 175: This command places the disk storag
Page 176 and 177: ANY ERROR: This indicator turns on
Page 178 and 179: LogicalDataRecordIBGapLRCIBGap.._01
Page 180 and 181: A tape mark read from seven-track t
Page 182 and 183: Modifier bits perform the five func
Page 184 and 185: an XIO initialize read operation wi
Page 186 and 187: Communications AdapterINTRODUCTIONT
Page 190 and 191: Bit PositionsP, 7, 6, 54, 3, 2, 100
Page 192 and 193: Standard replies as well as NAK cau
Page 194 and 195: either seeking characters received
Page 196 and 197: CA IOCC'sInitialize Write0 15 0 4 8
Page 198 and 199: TIMEOUT: This indicator turns on, c
Page 200 and 201: 0 I 2 3 4 5 6 7 8 9 10 11 i2 13 14
Page 202 and 203: ETB, ETX, AND ENQ: These characters
Page 204 and 205: .■••.0■-3toCOc.nroz0F21.0fa
Page 206 and 207: Selector ChannelThe selector channe
Page 208 and 209: CCW Word 1 CCW Word 2 CCW Word 315B
Page 212 and 213: limited to the number of sense byte
Page 214 and 215: CSW Word 1 CSW Word 2 CSW Word 3 CS
Page 216 and 217: CSW Word 2 CSW Word 3CSW Word 40 3
Page 218 and 219: Termination of an operation with a
Page 220 and 221: Device end, when subsequently provi
Page 222 and 223: System /360 AdapterINTRODUCTIONThe
Page 224 and 225: specified by the channel command wo
Page 226 and 227: ATTENTION: This status indicates th
Page 230 and 231: HALT: This bit turns on, causing an
Page 234 and 235: Start Byte AS Address Byte Device A
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Read data request causes the adapte
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If a 1053 Printer is addressed by t
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specific 16-word block within the c
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LCCBWord1Address Word(Active Frame)
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channel active is interrogated. If
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Form GA26-5918-8Page Revised 10/1/7
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AREA STATION LOCAL I/O TRANSACTION
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244Form GA26-5918-8Page Added 10/1/
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When all segments are bypassed modi
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0. It can occur only during a read
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HexadecimalValueDouble Compare (DCM
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Appendix B. I/O Device AddressingTh
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1054 AND 1055 PAPER TAPEWRITE: Punc
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INITIALIZE WRITE: Move contents of
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INITIALIZE READ: Move tape data to
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AREA FEATURE 0 1 2 3 4 5 6 7 8 9•
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Clear (Continued)Storage (Continued
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Converting Thermocouple Characteris
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4Input/Output Control (Continued)On
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Loop Channel (Continued)Control Blo
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Pulse OutputDescription of 125Timer
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Storage ProtectBit (S) 10Bit Light
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1053 Printer (Continued)Maximum Rat
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1810 Disk Storage (Continued)Read/W
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IBM Technical Newsletter File Numbe
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^;``
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• READER'S COMMENT FORM•▪ IBM
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• READER'S COMMENT FORM• IBM 18
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• READER'S COMMENT FORM• IBM 18
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