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Length: 3328 (0xd00)
Types: RcTekst
Names: »99110079.WP«
└─⟦7fab0c8ae⟧ Bits:30005866/disk3.imd Dokumenter i RcTekst format (RCSL 99-1-*)
└─⟦this⟧ »99110079.WP«
╱04002d4e0a00060000000002013b3140000000000000000000000000000000000000000000000000050f19232d37414b555f69737d8791ff04╱ ┆06┆i↲ ↲ ┆b0┆┆a1┆TABLE OF CONTENTS┆05┆PAGE↲ ↲ 1. GENEREL ............................................ 1↲ ↲ 2. LOGIC DIAGRAMS ..................................... 2↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆06┆ii↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆14┆┆b3┆┆06┆┆0b┆↲ ┆82┆┆b0┆┆a1┆1. GENEREL↲ ↲ The COM751 board is a communication module, which may be ↓ used in a RC750 system. The COM751 can be plugged into the ↓ I/O expansion plug on the RC750 cpu board.↲ ↲ The COM751 provides the RC750 system with two extra V.24 ↓ asynchronous channels. The transfer rate is programmable and ↓ max. 19.2 k baud.↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆b0┆┆a1┆2. LOGIC DIAGRAMS↲ ↲ ┆a1┆┆b0┆Signal name┆06┆Description┆05┆↲ -,RTSA╞ ╞ ┆84┆'Request to send' signal from ↓ ┆19┆┆98┆┄┄channel A↲ -,DTRA╞ ╞ ┆84┆'Data Terminal Ready' signal from ↓ ┆19┆┆98┆┄┄channel A.↲ TxDA╞ ╞ ┆84┆'Transmit Data' signal from channel ↓ ┆19┆┆98┆┄┄A.↲ RxRDYA╞ ╞ ┆84┆'Receiver ready' interrupt signal ↓ ┆19┆┆98┆┄┄from channel A.↲ TxRDYA╞ ╞ ┆84┆'Transmitter ready' interrupt signal ↓ ┆19┆┆98┆┄┄from channel A.↲ -,RTSB╞ ╞ ┆84┆'Request To Send' signal from ↓ ┆19┆┆98┆┄┄channel B.↲ -,DTRB╞ ╞ ┆84┆'Data Terminal Ready' signal from ↓ ┆19┆┆98┆┄┄channel B.↲ TxDB╞ ╞ ┆84┆'Transmit Data' signal from channel ↓ ┆19┆┆98┆┄┄B.↲ RxRDYB╞ ╞ ┆84┆'Receiver Ready' interrupt signal ↓ ┆19┆┆98┆┄┄from channel B.↲ TxRDYB╞ ╞ ┆84┆'Transmitter Ready' interrupt signal ↓ ┆19┆┆98┆┄┄from channel B.↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ COM751╞ ╞ ┆84┆Programmable Communication ↓ ┆19┆┆98┆┄┄Controllers, channel A and B.↲ ════════════════════════════════════════════════════════════════════════ ↓ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆b0┆┆a1┆Signal name┆06┆Description┆05┆↲ -,CS0╞ ╞ Chip select to 8251A channel A.↲ -,CS1╞ ╞ Chip select to 8251A channel B.↲ -,CS2╞ ╞ Chip select to status buffer.↲ CLK╞ ╞ ╞ CPUCLK divided by 4: 2 MHz/1.5MHz.↲ CPUCLK/2╞ ╞ CPUCLK divided by 2: 4 MHz or 3 MHz.↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ COM751╞ ╞ I/O-select and clock.↲ ════════════════════════════════════════════════════════════════════════ ↓ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆a1┆┆b0┆Signal name┆06┆Description┆05┆↲ -,TxCA╞ ╞ Baud rate clock for channel A.↲ -,TxCB╞ ╞ Baud rate clock for channel B↲ RESET╞ ╞ Reset signal to the 8251A devices.↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ COM751╞ ╞ Programmable baud rate generator↲ ════════════════════════════════════════════════════════════════════════ ↓ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆a1┆┆b0┆Signal name┆06┆Description┆05┆↲ IOINT1╞ ╞ IO-interrupt signal to CPU-board.↲ -,D0-7╞ ╞ IO-data bus.↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ COM751╞ ╞ Interrupt logic and Status buffer.↲ ════════════════════════════════════════════════════════════════════════ ↓ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆b0┆┆a1┆Signal name┆06┆Description┆05┆↲ A1-3╞ ╞ Address bit 1 to 3.↲ -,IORD╞ ╞ IO read signal↲ -,IOWR╞ ╞ IO write signal↲ -,RESET╞ ╞ Reset signal↲ -,PCS5,-,PCS6╞ ╞ Peripheral chip select signals.↲ -,CPUCLK╞ ╞ Clock from CPU-board↲ ID0-7╞ ╞ IO data bus.↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ COM751╞ ╞ CPU board systembus interface↲ ════════════════════════════════════════════════════════════════════════ ↓ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆a2┆┆b0┆┆e2┆┆b0┆┆a1┆Signal name┆06┆Description┆05┆↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ -,CIA, -,CIB╞ ╞ Calling Indicator (channel A and B).↲ -,DCDA, -,DCDB╞ Data Carrier Detect.↲ -,DSRA, -,DSRB╞ Data set ready.↲ -,CTSA, -,CTSB╞ Clear to Send↲ RxDA, RxDB╞ ╞ Receive Data.↲ -,RxCA╞ ╞ Receive clock, channel A.↲ -,TxCA╞ ╞ Transmit clock, channel A.↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ COM751╞ ╞ V.24 serial interface↲ ════════════════════════════════════════════════════════════════════════ ↓ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆b0┆┆a1┆Signal name┆06┆Description┆05┆↲ DATA SET READY╞ V.24 modem Control signals for ↲ DATA CARRIE DETECT╞ channel A and B.↲ CLEAR TO SEND↲ CALLING INDICATOR↲ ↲ RECEIVE DATA╞ ╞ V.24 data signals for channel A and ↓ TRANSMIT DATA╞ ╞ B.↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ COM751╞ ╞ V.24 - 15 pol connector interface↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆1a┆┆1a┆↓ ┆1a┆H↲ ↲ RD,WR↲ ↲ ↲ ┆a1┆Parallel printer MULTIBUS┆f0┆ card is able to ↓ ┆19┆┆89┆┆85┆┄gain control of the ┆b0┆MULTIBUS┆f0┆ at a given time. The Bus ↓ ┆19┆