ECHOPLEX Mac OS

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The Maestro Echoplex is an analogue tape delay machine dating back to 1959. Inspired by another echo machine created in 1950 by Ray Butts. Respawn (gamer165) mac os. The Echoplex was originally tube powered but later models such as the EP-3 and EP-4 were solid-state units. When most people talk about the Echoplex, it's typically the EP-3 that they're referring to. ECHOPLEX PREAMP To combine the EP103 with the EP101 Echoplex Preamp for the full Echoplex EP-3 experience, simply run the EP101 in front of the EP103. DIRECTIONS. Run a standard cable from your guitar to the EP103's INPUT jack and another cable from the EP103's OUTPUT jack to your amplifier. Start with all controls at 12 o'clock.

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Discussion in 'REAKTOR' started by rhcole, Mar 24, 2005.

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In telecommunications, echo is the local display of data, either initially as it is locally sourced and sent, or finally as a copy of it is received back from a remote destination. Local echo is where the local sending equipment displays the outgoing sent data. Remote echo is where the display is a return copy of data as received remotely.^[1][2] Both are used together in a computed form of error detection to ensure that data received at the remote destination of a telecommunication are the same as data sent from the local source (a/k/a echoplex, echo check, or loop check). When (two) modems communicate in echoplex mode the remote modem echoes whatever it receives from the local modem.^{[3][4][5][6][7]}

Terminological confusion: echo is not duplex[edit]

A displayed 'echo' is independent of 'duplex' (or any) telecommunications transmission protocol. Probably from technical ignorance, 'half-duplex' and 'full-duplex' are used as slang for 'local echo' (a/k/a echo on) and 'remote echo', respectively, as typically they accompany one another. Strictly incorrect, this causes confusion (see duplex). Typically 'local echo' accompanies half-duplex transmission, which effectively doubles channel bandwidth by not repeating (echoing) data back from its destination (remote), as is reserved-for with 'full duplex' (which has only half of the bandwidth of 'half duplex'). Half-duplex can be set to 'echo off' for no echo at all.^[8][6]

One example of 'local echo' used together with 'remote echo' (requires full-duplex) is for error checking pairs of data characters or chunks (echoplex) ensuring their duplicity (or else its just an extraneous annoyance).^[9][10]

Queen bee slot machine. Similarly, for another example, in the case of the TELNET communications protocol a local echo protocol operates on top of a full-duplex underlying protocol. The TCP connection over which the TELNET protocol is layered provides a full-duplex connection, with no echo, across which data may be sent in either direction simultaneously.^[11] Whereas the Network Virtual Terminal that the TELNET protocol itself incorporates is a half-duplex device with (by default) local echo.^[12][13]

The devices that echo locally[edit]

Terminals are one of the things that may perform echoing for a connection. Others include modems, some form of intervening communications processor, or even the host system itself.^[8] For several common computer operating systems, it is the host system itself that performs the echoing, if appropriate (which it isn't for, say, entry of a user password when a terminal first connects and a user is prompted to log in). On OpenVMS, for example, echoing is performed as necessary by the host system. Similarly, on Unix-like systems, local echo is performed by the operating system kernel's terminal device driver, according to the state of a device control flag, maintained in software and alterable by applications programs via an ioctl() system call.^[14][15] The actual terminals and modems connected to such systems should have their local echo facilities switched off (so that they operate in no echo mode), lest passwords be locally echoed at password prompts, and all other input appear echoed twice. This is as true for terminal emulator programs, such as C-Kermit, running on a computer as it is for real terminals.^[14][16]

Controlling local echo[edit]

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Terminal emulators[edit]

Most terminal emulator programs have the ability to perform echo locally (which sometimes they misname 'half-duplex'):^[17] Nijowari: where angels fall mac os.

• In the C-Kermit terminal emulator program, local echo is controlled by the SET TERMINAL ECHO command, which can be either SET TERMINAL ECHO LOCAL (which enables local echoing within the terminal emulator program itself) or SET TERMINAL ECHO REMOTE (where disables local echoing, leaving that up to another device in the communications channel—be that the modem or the remote host system—to perform as appropriate).^[16]
• In ProComm it is the Alt+E combination, which is a hot key that may be used at any time to toggle local echo on and off.^[18]
• In the Terminal program that came with Microsoft Windows 3.1, local echo is controlled by a checkbox in the 'Terminal Preferences' dialogue box accessed from the menu of the terminal program's window.^[19][20][21]

Modems[edit]

The Hayes AT commands that control local echo (in command mode) are E0 for off and E1 for on. For local echo (in data mode), the commands are F1 and F0 respectively. Note the reversal of the suffixed digits. Unlike the 'E' commands, the 'F' commands are not part of the EIA/TIA-602 standard.^[17][22]

Host systems[edit]

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Some host systems perform local echo themselves, in their device drivers and so forth.

• In Unix and POSIX-compatible systems, local echo is a flag in the POSIX terminal interface, settable programmatically with the tcsetattr() function.^{[23][fn 1]} The echoing is performed by the operating system's terminal device (in some way that is not specified by the POSIX standard). The standard utility program that alters this flag programmatically is the stty command, using which the flag may be altered from shell scripts or an interactive shell.^[25] The command to turn local echo (by the host system) on is stty echo and the command to turn it off is stty -echo.^{[26][fn 2]}
• On OpenVMS systems, the operating system's terminal driver normally performs echoing.^[29] The terminal characteristic that controls whether it does this is the ECHO characteristic, settable with the DCL command SET TERMINAL /ECHO and unsettable with SET TERMINAL /NOECHO.^{[30][fn 3]}

Controlling local echo[edit]

Mac Os Download

Terminal emulators[edit]

Most terminal emulator programs have the ability to perform echo locally (which sometimes they misname 'half-duplex'):^[17] Nijowari: where angels fall mac os.

• In the C-Kermit terminal emulator program, local echo is controlled by the SET TERMINAL ECHO command, which can be either SET TERMINAL ECHO LOCAL (which enables local echoing within the terminal emulator program itself) or SET TERMINAL ECHO REMOTE (where disables local echoing, leaving that up to another device in the communications channel—be that the modem or the remote host system—to perform as appropriate).^[16]
• In ProComm it is the Alt+E combination, which is a hot key that may be used at any time to toggle local echo on and off.^[18]
• In the Terminal program that came with Microsoft Windows 3.1, local echo is controlled by a checkbox in the 'Terminal Preferences' dialogue box accessed from the menu of the terminal program's window.^[19][20][21]

Modems[edit]

The Hayes AT commands that control local echo (in command mode) are E0 for off and E1 for on. For local echo (in data mode), the commands are F1 and F0 respectively. Note the reversal of the suffixed digits. Unlike the 'E' commands, the 'F' commands are not part of the EIA/TIA-602 standard.^[17][22]

Host systems[edit]

Echoplex Mac Os Update

Some host systems perform local echo themselves, in their device drivers and so forth.

• In Unix and POSIX-compatible systems, local echo is a flag in the POSIX terminal interface, settable programmatically with the tcsetattr() function.^{[23][fn 1]} The echoing is performed by the operating system's terminal device (in some way that is not specified by the POSIX standard). The standard utility program that alters this flag programmatically is the stty command, using which the flag may be altered from shell scripts or an interactive shell.^[25] The command to turn local echo (by the host system) on is stty echo and the command to turn it off is stty -echo.^{[26][fn 2]}
• On OpenVMS systems, the operating system's terminal driver normally performs echoing.^[29] The terminal characteristic that controls whether it does this is the ECHO characteristic, settable with the DCL command SET TERMINAL /ECHO and unsettable with SET TERMINAL /NOECHO.^{[30][fn 3]}

Footnotes[edit]

1. ^In the older and superseded Seventh Edition Unix terminal interface, BSD version 4 terminal interface, and System III/System V terminal interface, it was settable via the ioctl() system call.^[24]
2. ^This may not seem to work if used interactively. It does work. It's just immediately overridden. Some shells, such as tcsh, reset the terminal modes, including turning local echo off, when they are about to prompt for input. They actually place the terminal into non-canonical mode with local echo off, and handle echoing themselves, restoring the prior terminal attributes when the input line has been read. Any shell or other program that uses GNU readline also exhibits this interaction with stty -echo.^[27][28]
3. ^Note that this is not the same as the LOCAL_ECHO terminal characteristic, settable with the DCL command SET TERMINAL /LOCAL_ECHO and unsettable with SET TERMINAL /NOLOCAL_ECHO. That characteristic controls whether the terminal itself performs local echo.^[14][30]

References[edit]

What supports what[edit]

1. ^Graf 1999, p. 230.
2. ^Anmol 2000, p. 80.
3. ^Rosch 1999, p. 1161.
4. ^Weik 2000, 'echo check' p. 478.
5. ^Weik 2000, 'echoplex' p.479.
6. ^ ^abJordan & Churchill 1987, p. 24.
7. ^Hill Associates 2002, p. 341.
8. ^ ^abDaintith 2004, p. 171.
9. ^Bagad & Dhotre 2009, p. 9–4.
10. ^Black 1987, p. 203.
11. ^Socolofsky & Kale 1991, p. 24.
12. ^IBM 1995, p. 2.
13. ^Postel & Reynolds 1983, p. 2.
14. ^ ^abcDuffy 2002, p. 43.
15. ^Leffler et al. 1989, p. 38,262,272.
16. ^ ^abDa Cruz & Gianone 1997, p. 158–159.
17. ^ ^abBigelow 2000, p. 308.
18. ^Woggon 1995, p. 101.
19. ^Cowart 1992, p. 283.
20. ^Sheldon 1991, p. 678.
21. ^Norton & Kent 1993, p. 347.
22. ^Durda 2004.
23. ^Robbins & Robbins 2003, p. 204–205.
24. ^Leffler et al. 1989, p. 262.
25. ^Robbins & Robbins 2003, p. 203.
26. ^Sobell & Seebach 2006, p. 855.
27. ^Sobell & Seebach 2006, p. 856.
28. ^Ramey 2009.
29. ^Miller 1992, p. 30.
30. ^ ^abLeisner & Cook 1990, p. 136,158.

Sources used[edit]

• Bagad, V.S.; Dhotre, I.A. (2009). Data Communication & Networking. Technical Publications. ISBN978-81-8431-759-6.
• Black, Uyless D. (1987). Data communications and distributed networks (2nd ed.). Prentice-Hall. ISBN978-0-8359-1341-6.
• Bigelow, Stephen J. (2000). PC Technician's Troubleshooting Pocket Reference (2nd ed.). McGraw-Hill Professional. ISBN978-0-07-212945-8.
• Cowart, Robert (1992). Mastering Windows 3.1. Sybex. ISBN978-0-89588-842-6.
• Daintith, John (2004). 'echo'. Oxford dictionary of computing (5th ed.). Oxford University Press. ISBN978-0-19-860877-6.
• Da Cruz, Frank; Gianone, Christine M. (1997). Using C-Kermit: communication software (2nd ed.). Digital Press. ISBN978-1-55558-164-0.
• Duffy, Michael D. (2002). Getting started with OpenVMS: a guide for new users. Digital Press. ISBN978-1-55558-279-1.
• Durda, Frank (2004). 'Section 3: Unprefixed AT Commands'. The AT Command Set Reference.
• Graf, Rudolf F. (1999). 'echo'. Modern dictionary of electronics (6th ed.). Newnes. ISBN978-0-7506-9866-5.
• Hill Associates (2002). Telecommunications: a beginner's guide. Network professional's library. McGraw-Hill Professional. ISBN978-0-07-219356-5.
• 'Telnet and the Telnet Protocol'(PDF). IBM. June 1995. Archived from the original(PDF) on 2011-07-07. Retrieved 2011-01-23.
• Jordan, Larry E.; Churchill, Bruce (1987). Communications and networking for the IBM PC & compatibles (2nd ed.). Brady. ISBN978-0-89303-634-8.
• Leffler, Samuel J.; McKusick, Marshall Kirk; Karels, Michael J.; Quarterman, John S. (1989). 'Terminal Handling'. The Design and implementation of the 4.3BSD UNIX operating system. Addison-Wesley series in computer science. Addison-Wesley. ISBN978-0-201-06196-3.CS1 maint: discouraged parameter (link)
• Leisner, K. M.; Cook, David B. (1990). VAX DCL programmer's reference VMS 5. Van Nostrand Reinhold. ISBN978-0-442-31834-5.
• Miller, David Donald (1992). VAX/VMS: operating system concepts. VAX-VMS Series. Digital Press. ISBN978-1-55558-065-0.
• Norton, Peter; Kent, Peter (1993). Peter Norton's user's guide to Windows 3.1. Bantam Books. ISBN978-0-553-37148-2.
• Ramey, Chet, ed. (2009). '2.5 Readline Signal Handling'. GNU Readline Library.
• Postel, Jon; Reynolds, J. (May 1983). 'Motivation for the Option'. RFC 0857: Telnet Echo Option.
• Robbins, Kay A.; Robbins, Steven (2003). UNIX systems programming: communication, concurrency, and threads (2nd ed.). Prentice Hall PTR. ISBN978-0-13-042411-2.
• Rosch, Winn L. (1999). Winn L. Rosch hardware bible (5th ed.). Que. ISBN978-0-7897-1743-6.
• Sheldon, Thomas (1991). Windows 3: the complete reference. Osborne McGraw-Hill. ISBN978-0-07-881679-6.
• Sobell, Mark G.; Seebach, Peter (2006). A practical guide to Unix for Mac OS X users. Prentice Hall PTR. ISBN978-0-13-186333-0.
• Socolofsky, T.; Kale, C. (January 1991). 'Transmission Control Protocol'. RFC 1180: A TCP/IP Tutorial.
• Weik, Martin H. (2000). Computer Science and Communications Dictionary. 1. Springer. ISBN978-0-7923-8425-0.Missing or empty |title= (help)
• Woggon, Michele (1995). Telecommunications using ProComm & ProComm Plus made easy. Prentice Hall. ISBN978-0-13-148412-2.
• 'local echo'. Advanced learner's dictionary of journalism. Advanced Learner's Dictionary Series. Anmol Publications PVT LTD. 2000. ISBN978-81-261-0469-7.

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