Ham Radio 2000 #1

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Text File | 1993-04-14 | 36.2 KB | 583 lines

***************************************************************************** * This document is typically the only documentation provided with * * publically released versions of GCE for the DSP-12. This document * * contains a brief description of the files involved in these releases. * * It also contains documentation on the changes made from release to * * release starting with GCE version 1.85. * ***************************************************************************** ***************************************************************************** * F I L E S D O C U M E N T A T I O N * ***************************************************************************** This GCE release is ZIP'ed using PKZIP version 1.02. It contains the following files: RELEASE.NOT - This file GCE.D - The EPROM image of the "D" prom for this version of GCE. GCE.F - The EPROM image of the "F" prom for this version of GCE. GCE.V40 - The down-loadable image for this version of GCE. NOTE: EPROM images should be programmed into 200ns (or faster) 27C512 EPROMs. NOTE: The down-loadable image of GCE (GCE.V40) can only be downloaded into the DSP-12 if the DSP-12 has the One Megabyte RAM Expansion option. The DSP-12 manual includes instructions on how to download and run this software. These instructions appear in appendix B of the manual. THIS IS THE BEST WAY TO CHECK OUT A NEW SOFTWARE VERSION. TRY IT - YOU'LL LIKE IT! If the layout of nonvolatile memory has changed from your prom-based version to this version you'll have to ABR and re-configure when you start this version and when you return to the prom-based software. You'll also lose the contents of your mailbox. ***************************************************************************** * R E L E A S E D O C U M E N T A T I O N * ***************************************************************************** Users of this documentation will notice occasional gaps in the version sequence numbering. These gaps occur as I release beta versions to local testers for their input. =============================================================================== Version 1.85 Packet & RTTY: - The QUIT command has been enhanced to accept a parameter. When specified this parameter is interpreted as the mode the DSP-12 should change to. For example, from VHF packet mode entering Q F<cr> will cause the DSP-12 to exit VHF packet mode and enter 9600bps UO-14 mode. - Packet and RTTY commands that previously accepted parameters of OFF and ON now accept OFF, NO, & N for OFF and ON, YES, & Y for ON. - The Packet and RTTY parameters that were simply OFF/ON or a number now display the "was" status when a change is accepted. We will gradually expand this feature to cover all packet and RTTY parameters. Packet: - The Monitor function now displays frames that are digipeated by the DSP-12. - RESTART command actually restarts the mode. The restart function takes about 3 seconds to complete. - MYALIAS fully implemented. - Step outputs no longer momentarily flip active during QUIT. - Step-needed sensing has been opened one Tuning LED division so a slightly farther off-tuned BPSK signal can be tolerated before the DSP-12 acts to step (re-tune) the radio. - Step outputs were enabled in all packet modes. These outputs are now only enabled in the FO-20 (E) and PACSAT (P) modes. - MDATA command added; when OFF monitored I and UI frames do not show their accompanying data. - MAILBOX command has been removed until the MAILBOX functions and the needed external support programs are completed. - UNPROTOCOL repeater-list procedure now only inserts defined repeaters into the address list. - BREAK termination of converse and transparent modes has been modified to exactly duplicate the operation of a TNC-2. This modification has been made to let the DSP-12 operate properly with the PG satellite interface program. RTTY: - Baudot no longer sends space characters as diddles. - Push-To-Talk Timer now disabled in RTTY modes. =============================================================================== Version 1.88 General: - Command added to the debugging menu to disable the Power-Up ABR feature. The enablement/disablement parameter is stored in non-volatile storage. This new command is useful for DSP-12 software developers who place the DSP-12 into debugger mode immediately after power-up. Packet: - REJ state processing revised so that REJs not heard by the remote node are repeated. - BCAST command has been added for commercial data transmissions. The planned suppression of duplicated receive frames has not been implemented. BPSK: - ABR rate has been speeded up so the AO-13 telemetry demodulator can keep up with AO-13's spin rate. KISS: - KISS-mode command bug where the parameter being changed was being set to the command code (eg, TXDELAY was always set to 1) instead of the command parameter has been fixed. =============================================================================== Version 1.90 General: - Power-up ABR feature disabling command deleted. This ABR suppress function is now performed whenever the V40 debugger's Down-load command is invoked. RTTY: - Modified TX data handling so nothing is actually queued for sending until a space character, a carriage-return, the transmit-data character (^T) or the receive character (^R) is supplied to the terminal port by the user. This lets the user correct typo's in his input (at least until he types a space or <CR> character or tries to send the data). Added QONSPACE command to disable send-on-space sensitivity so the entire line can be edited before being sent. - Enhanced the MODEM command prompt format to make it more readable. - Previous versions of CGE did not report an illegal memory-buffer select character (0-9). This version does report this type of error. Packet: - The CSTATUS display has been enhanced to include the AX.25 level (LVL-1 or LVL-2) of the remote node. - The KISS mode implementation has been revised to improve 9600bps data throughput. Users will no longer have access to the packet command-mode menuing system while in KISS mode. KISS mode will operate like the standard TNC-2 implementation. Once the KISS parameter is set on the KISS mode will not be entered until a RESTART command is issued or the operating mode is exited and then returned to (the same effect as RESTART). KISS mode can be exited by issuing the KISS OFF command via the KISS protocol and by using the transparent-mode exit methods (break & timed CMDC characters). =============================================================================== Version 1.91 Electrical: - The 1 amp slo-blo fuse normally supplied with the DSP-12 has proven in service to have a marginal current rating that causes occasional fuse failures. We recommend that users who experience a fuse failure change to a 1.5 - 2 amp fuse. General: - A new command has been added to the setup menu that allows the user to suppress the mode identification text (eg "<UO-14 PKT> cmd:") in those operating modes with command prompts (Packet and RTTY modes). Some users have had problems with terminal programs that don't recognise the cmd: prompt because of the extra text on the command line before the command prompt. - We've found that the 9600bps (UO-14 mode) modem's AGC is broken so it doesn't work well with low signal levels; this will be fixed in the next version of software. Packet: - MYCALL and MYALIAS have been moved into the mode-based parameter save area from their previous position in the command parameter area. This means that MYCALL and MYALIAS can now be set to different values by mode. In order to avoid having to set these parameters for each mode, GCE will save the last-set values of these parameters and apply this setting (at entry to the operating mode) to all modes whose MYCALL and MYALIAS have not been set. This means that users will be able to set MYCALL and MYALIAS for one packet mode and this setting will be propogated to all packet modes with MYCALL settings of "MYCALL". - A new parameter has been added named MODON. When MODON is set ON the modem's tx modulator will continue to generate an output signal even if the DSP-12 is not attempting to send data. This parameter is defaulted to OFF for all packet operating modes but UO-14 (whose default is ON). In normal operation the UO-14 modulator is kept active to keep the DSP-12's and radio modulator's filters "centered". In some applications this signal interferes with the radio's receive operation. When this occurs in UO-14 operating mode, set the MODON parameter OFF. Note that the MODON parameter is only implemented when the operating mode is started from GCE. Once the MODON parameter is changed the user must exit to GCE and re-enter the operating mode for the modem output state to be set correctly. - New commands RADIOUp & RADIODn have been added to the command interface for development purposes. For the time being, these commands will be accepted without error but perform no function. When fully implemented these commands will cause the step signal outputs to be activated the specified number of times in the specified direction. The supplied parameter (max = 255, default = 1) is summed into a signed accumulator so multiple commands will "net out" to the correct number of steps in the correct direction. =============================================================================== Version 1.92 General: - Fixed a bug that caused up to 256 characters to be lost when data was to be sent to an XOFF'd terminal. This was most noticable in packet modes when a terminal program XOFF's off the DSP-12's output before shelling to DOS or some other application. - Added step-output status to the tuning display. While the UP step output is active the right-most tuning-display LED will be reversed. While the DOWN step output is active the left-most tuning-display LED will be reversed. Reversing the LEDs turns them off if they were on and on if they were off. This process ensures that the LED shows an observable change. - Both the Packet and RTTY user interfaces now identify the current operating mode when starting up. Packet: - The packet protocol handler has been modified so it will no longer send data or beacon frames if MYCALL is set to "MYCALL" (its default value). This modification doesn not apply if KISS or BCAST is set on. - I've fixed the bug that made the DSP-12 crash when the SYSOP command was invoked with the MAILBOX parameter set on, and re-enabled the MAILBOX command. The hooks to let remote users log onto the mailbox are not yet in place. I want to create mailbox "dump" and "restore" commands so pending mail can be saved to a PC's disk. - Located and corrected a bug that corrupted memory whan a connect command was used. This bug has only existed since 1.91. - Located and corrected a bug that left the DSP-12 hanging in protocol state S7 with the STA LED lit when the link-activity timer as restarted. Mailbox Plans: - The DSP-12 has 4.7k of unused non-volatile memory (bbRAM) in its standard configuration. Users with the clock option installed can replace the 6264LP SRAM on the V40 board with a 62256LP part (no other changes are needed). NOTE: Make sure you use a low-power (LP) part! This change will increase the amount of unused bbRAM to 29.2k. I will have the DSP-12 determine the amount of installed bbRAM at power-up. - I'm going to modify the mailbox memory manager to keep the mailbox directory and as much of the mailbox data as possible in bbRAM. Mailbox data that overflows the available BBRAM will be lost unless the customer has the One Megabyte RAM Option installed. If this extra memory is installed the bank-switched upper half will be used for mail data. If the user turns off his DSP-12 any mail data saved in the bank-switched expanded RAM will be lost. The mailbox contents will be accessible from any packet mode. - I'd appreciate any comments on the available mailbox commands, including additional commands or interface codes you'd like to see made available. How many directory entries do you think we need? =============================================================================== Version 1.93 Packet: - Revised the level-2 T1 timer handling to make the T1 timer handling more reliable. =============================================================================== Version 1.94 UO-14: - Made changes to the UO-14 modem to improve its low-signal-level receive performance. - Decided to evaluate and implement a different TX waveform to improve transmit performance. This will occur in a later GCE release. =============================================================================== Version 1.95 General: - Changed the default RX & TX ports to VHF for the following modes: ACARS, AO-13 Telemetry, and all Packet modes except HF packet. - The processing involved in exiting one mode and restarting GCE or another mode used to take a couple of seconds. Under the changes of this version the delay period has been dramatically shortened and GCE will output a "Processing..." message to let users know that it is busy and not dead. - GCE now displays the amount of populated bbRAM installed. This is always either 8k or 32k. The DSP-12 is always shipped with 8k installed. If the user has purchased the clock backup option the 6264LP (8k low-power static ram or 8k LP-SRAM) on the V40 board can be replaced by the user with a 62256 32k LP-SRAM. This change increases the amount of non-volatile memory available to the mailbox function from 4.7k to 28.7k bytes. =============================================================================== Version 1.96 General: - Added "Beta" version numbering to the GCE numbering system. From this version on, beta test versions of a release will be created with a beta version number instead of a unique release number. The last beta version of a release version will become the release version. For example, suppose I release version 8.00. I'll archive 8.00 and create a working copy of this named 8.01 Beta 01. Beta test versions of the 8.01 version will be 8.01 Beta 01, 8.01 Beta 02, etc. When 8.01 beta testing completes the final beta version (say 8.01 Beta 12) will be renamed 8.01 and released as 8.01. I'll then move on to 8.02 Beta 01 and the cycle will continue. - Modified the GCE code invoked when a RESTART or QUIT is done such that working RAM is no longer cleared. This clearing was not needed and skipping this step speeds up the QUIT/RESTART process quite a bit. - Fixed a bug in the calibrate mode that showed an invalid input-level display on the tuning leds when the input signal contained a non-0 DC bias. RTTY: - The new line-editing capability in RTTY (see QONSPACE) wasn't actually queueing data for transmission when the Return-To-Rx-Mode character was received from the terminal. This has been corrected. Packet: - Got the mailbox function working. The STA LED pulses when the sysop has pending mail. Added the MBEAcon command which causes the beacon text (BTEXT) to be replaced with the usual "Mail for: " beacon text when the packet mode is invoked or a user disconnects from the DSP-12. When a user updates the mailbox the beacon timer (if active) is set to expire in three seconds so the "Mail for:" beacon is sent promptly. A copy of the manual's documentation on the packet mailbox feature follows. At this point automatic mail forwarding is not in place, the current software only uses non-volatile storage, and mail storage does not overflow into bank-switched ram. - Replaced the 9600 baud modem with an improved version that does not have the "flickering DCD" problem. - UO-14 Mode: Always set TXUI OFF (it defaults to ON) when using PG. If you don't when using PG & doing an upload that doesn't complete the remainder of the upload data will be sent out as UI frames. For a large file this steady transmit of frames can cause a PTT timeout. AMTOR - Started work on the AMTOR command interface. This interface can be played with. The parameter changes work. The commands don't work yet. =============================================================================== Version 1.97 General: - Speeded up the GCE re-initialization (from RESTART or QUIT) even further. This delay is now so minimal that I have removed the "Processing..." message from this operational phase. - DSP-12's without the Date/Time option now retain the date and time setting throughout all operating modes. Previous GCE versions lost the date and time setting whenever an operating mode was terminated. - Fixed another bug in the calibrate input-level display logic that caused one or more leds to stay on at all times in some DSP-12 units. - Fixed a bug in the step-output (BPSK packet modes) generation code. Previously steps were 100ms too long meaning that a step setting of 12/second actually only generated 5.5 steps/second. Now a step setting of 12 actually generates 12 steps a second. - Added a STEP ROUTING command to the PTT/STEP-Sense GCE menu (9A) that allows the user to override the normal step output routing. The normal step-output routing follows the current setting of the mode's RXPORT parameter. The STEP-ROUTING GCE command allows the user to force the DSP-12 to route the step outputs to the specified radio port regardless of the current operating mode or the current RXPORT settings. - Improved the GCE initialization's ability to detect errors in the parameters stored in non-volatile memory (battery backed ram or bbRAM). - Improved the BPSK modems. This change should improve the performance of the FO-20, PACSAT, AO-13 telemetry, and terrestrial BPSK modes. We have also added new BPSK terrestrial speeds; we now support terrestrial BPSK data rates of 75, 100, 150, 300, 600, and 1200 bps. Packet modes below 300 bps will default their TXDELAY parameter to 60 (600ms) instead of 30. Packet: - UNPROTOCOL command: If the user reduced the number of calls in the callsign list the later callsigns of the longer list were retained in the shorter list. This bug has been fixed. - Added STEPS command. The DSP-12 can generate step output strobes (mic click strobes) to keep the receiver tuned during a low-earth-orbit satellite pass. When the STEPS parameter is set OFF the DSP-12 will not generate these step outputs. When STEPS is set to USB the step-up output will be activated if the received tone is low and vice versa. When STEPS is set to LSB the step-down output will be activated if the received tone is low and vice versa. This option should only be used in satellite BPSK modes (PACSAT and FO-20) and is defaulted to USB in these modes. STEPS defaults to OFF in all other packet modes. - Corrected an error in the manual. The UNPROTOCOL and LCALLS parameters use a lot of battery-backed non-volatile RAM space and were made global to all packet modes long ago. For this reason, changing UNPROTOCOL in any packet mode will cause that change to appear in the UNPROTOCOL parameter in all packet modes. - Modified the defaulting of the FULLDUP parameter so it defaults ON in PACSAT, FO-20, & UO-14 modes and OFF in all other packet modes. AMTOR: - Continued AMTOR development. Implemented the CW id'er. UO-11 Telemetry - Added support for UO-11 telemetry demodulation. =============================================================================== Version 1.98 General: - Added a PTT ROUTING command to the PTT/STEP-Sense GCE menu (9A) that allows the user to override the normal PTT output routing. The normal PTT-output routing follows the current setting of the mode's TXPORT parameter. The PTT-ROUTING GCE command allows the user to force the DSP-12 to route the PTT output to the specified radio port regardless of the current operating mode or the current TXPORT settings. TX audio will continue to follow the TXPORT setting. ACARS - Made extensive improvements to the readability of the data displays. Converted the user interface to the "cmd:" format. - Added TIMESTAMP command. Setting TIMESTAMP ON causes the date and time to be displayed before each displayed message. - Added SUPPRESS command. Setting SUPPRESS ON causes the following messages to be ignored (not displayed): Link Test, General Response, Voice-to-ACARS, No Delivery On Uplink. =============================================================================== Version 1.99 General: - Added a new mode that can capture, play, and pipe audio samples. This mode requires the 1 Meg RAM option, and can currently store about 2.5 minutes worth of audio data using the normal data rate. - The program that generates the GCE prom images (PLOCATE) has been modified to fine tune the generated prom images so that a) the prom checksums always end in 00 (eg 9400), and b) the prom checksum itself is imbedded in the prom in such a way that the prom bytes including the checksum bytes add up to the imbedded checksum. The GCE initialization code has been modified to show "(BAD!)" and generate a ASCII BELL after each checksum is displayed if bad prom checksums are detected. Note that down-loading this version of software into a DSP-12 operating from prior-version proms will cause this error to be generated; no action need be taken in this situation. - The ability to deliberately cause a power-up ABR (AutoBaudRate) has been restored. This has been broken for a few versions. Power-up ABR is useful at times when the terminal interface is running at an unknown speed. Instructions for use are in the DSP-12 manual. - The PTT routing command from 1.98 had a bug that sometimes made the PTT routing go to a fixed port even though the PTT routing was set to NORMAL. This has been fixed. - UO-14 mode (mode F) has been renamed UO-22 mode in the GCE menus. - The default step rate has been changed from 1 step per second to 12 steps per second. - The Return-To-Mode feature (in SETUP menu) has been modified. The original implementation caused GCE to return to the prior operating mode upon power-fail (power removed and then re-applied). The Return- To-Mode parameter is now a list of operating modes. GCE enters each specified mode in turn with each power-fail; if a single mode is specified this mode is always entered at power-fail. This modification is useful for applications where rapid movement from mode to mode is useful but the terminal programs don't allow access to GCE's menus. A good example of this is AO-13 telemetry, where rapid movement from telemetry-PSK mode to RTTY mode is very useful. - Fixed a bug in the PASSALL character handling. When the PASSALL character is entered during input line accumulation a "<Pass>" prompt is generated so the user knows the next character will be accepted as text without any special-character testing. Mailbox: - Fixed a bug in the message numbering system that caused the message number counter for new messages to restart at 1 every time the DSP-12 was reset. New message numbering will now start at one past the highest message number in the mailbox. - Added a new option to the Kill (K) command. The K command can now be specified with an operand of "A[ll]"; when so specified the mailbox is emptied and the message counter is reset. The "K A[ll]" command is only available to the mailbox sysop. - Modified the implementation of the "3rdparty" packet parameter so that the sysop can now leave mail for other stations as well as receive mail from other stations when this parameter is OFF. Packet: - Added a new operating mode for the HAPN 4800 bps coherent packet modem. The GCE operating mode identifier is the letter "N". - The PACTIME timer is now reset whenever a transparent-mode frame is queued to be sent because the PACLEN length has been reached. Prior to this bug fix packet accumulation and transmit length was somewhat random as the PACTIME timer expired and caused whatever data was present to be queued for transmission. - Modified defaults: the CONMODE parameter now defaults to TRANSPARENT in PACSAT (P) and UO-22 (F) modes. - Moved the the BPSK tuning "window" (where the DSP-12 generates step outputs) two tuning bars leftward (about 100 Hz) to better fit the passband of the BPSK demodulator. The step outputs will hold the radio closer to the exact frequency. The step-generation logic has been made more intelligent; after a step or two it "learns" which direction the steps need to go and widens the step-activation window in the other direction so noise doesn't cause false steps in the wrong direction. - Created a special MFILTER control value ($80) that causes the following data values to be stripped from monitored packets: 1) ASCII DELETE ($7F) character 2) All binary values of $80 or higher 3) All ASCII control characters below space ($00 to $1F) except ASCII <CR> and ASCII <LF>. - Added FLOW command. When set on FLOW causes the received-data display routines to suspend operation while the operator is typing in a command. Once the command is entered an additional 3 second delay is introduced to allow the operator time to view any generated displays. Data-display generation resumes without this 3 second delay if the operator deletes the entered command using the backspace or delete keys. Since the DSP-12 has a finite amount of buffer space, the operator's pending input is deleted and any pending data is displayed if the amount of buffer space available for use in the DSP-12 falls below a critical level. Note that message timestamps are applied as the message is displayed, not when it is received. - Added THReshold command. This command is used to set the DCD threshold for modems requiring user input regarding appropriate DCD levels. At the present time this command is only used for modem debugging. The THReshold parameter may be set to any level from 0 to 100 (%), and defaults to 30%. This command will have no effect in packet operating modes that do not require user-settable DCD thresholds. When the THReshold command is entered without parameters at the cmd: prompt the current parameter setting will be displayed AND the DSP will be polled for the current DCD level. If the DSP modem is coded to respond to this poll (no released modems are as of 4/14/92), the current real DCD signal-level will also be displayed. - Added code to reset the retry counter when the T3 ("Are you still there?") timer expires. This fixes a problem with noisy links established for a long time where the "Are you there?" polls gradually increase the retry count until it overflows. - The DAYtime command has been added. This command is directly compatible with the TAPR TNC-2 command of the same name. Date/time changes are entered as DAYtime yymmddhhtt, where yy is the year, mm is the month, dd is the day, hh is the hour (24-hour clock) and tt is the minutes. The seconds setting is set to 0. This command also updates the GCE date & time, and writes the updated date/time to the clock-backup (if present). - Enhanced the DIsplay command. The enhanced command will now accept an optional parameter. If this parameter is "+" (eg, "DISPLAY +"), all current packet mode parameters will be displayed, each on its own line. - Fixed a problem wherein responses to a remotely-initiated connect were routed using the prior "via" repeater list. This was not seen with locally (keyboard) initiated connects. - Added the PTTTO command. This command allows the user to set the push- to-talk (PTT) timeout period in units of 10 seconds. Legal values range from 10 to 650. The default is 60. This command is useful in full duplex packet applications such as UO-22 where large files are being transferred and the transmitter is active for long periods of time. - Added a new parameter named "3rdparty". This parameter defines whether 3rd party traffic will be accepted by the DSP-12's mailbox. When set ON the DSP-12 mailbox will accept 3rd party mail traffic. When set OFF the DSP-12 mailbox will not accept 3rd party traffic. - Improved the VHF packet and HF packet modems. - Modified the "ID" command so it will not transmit if the MYCALL parameter is not set. - Fixed a bug: When either the MBEACON or the LFIGNORE params were set ON the beacon interval changed from units of 10 seconds to units of 100ms. In general this would make the beacon send continuously until the PTT timeout aborted the operating mode. - Implemented the new adaptive 9600 bps modem. - Fixed a bug wherein data frames were accidently sent as UI frames. - Modified the Push-To-Talk (PTT) timer so that ACK'd frames restart this timer. This modification allows the DSP-12 to transmit very large files in full duplex operating modes such as UO-22 satellite service without suffering a PTT timeout. RTTY: - The RTTY modems available since version 1.60 or so have been relatively deaf. We have returned to an older version of these modems while we research and resolve the problems. AO-13 Telemetry: - The AO-13 telemetry modem's performance has been improved. =============================================================================== Version 2.00 ******************************************* * Please note our new mailing address!!! * * * * L.L. Grace Communications Products * * P.O. Box 1345 * * Voorhees, NJ 08043 * ******************************************* General: - Fixed a bug in the "Return To Mode" feature that caused the DSP-12 to hang in an un-exitable command state whenever an illegal mode code was supplied in the return-to-mode list. RTTY: - Provided new RTTY FSK modems that should dramatically improve RTTY performance. We'd like customer feedback on these modems. Packet: - Provided new HF & VHF packet modems that should dramatically improve the performance of these operating modes. We'd like customer feedback on these modems. - Added a new command RXLEN. This parameter sets the size of the longest frame that can be properly received by the DSP-12. It defaults to 256. The existing PACLEN parameter now sets the maximum length of transmitted frames. The DSP-12 builds its packet memory pool with buffers sized to the larger of these two parameters. This automatic sizing feature can be used to improve the utilization of the DSP-12's memory, although the default values are completely adequate. Note that the PACLEN parameter will override the RXLEN parameter if PACLEN is greater than RXLEN; this is done so that the DSP-12 can always receive its own frames. - The PACLEN parameter (and the new RXLEN parameter) have been modified to allow the transmission and reception of frames larger than 256 data bytes. PACLEN and RXLEN may be set to values from 16 up to 1024 (32,768 if the 1 Meg RAM expansion option is present). Note that changes to PACLEN and RXLEN cause an automatic RESTART. - Fixed a bug in the MFILTER command that would not allow the user to set this parameter to values larger than 127 (7Fh). This bug interfered with the user setting MFILTER to $80. Pipe: - Added standardized "TAGS" to the beginning of each captured audio sample so that the PLAY function can play it back without needing to know what type of capture was used to create the file. - Modified the CAPTURE, PLAY, & PIPE commands to "eat" the terminating character (if any) from the input data queue. - Added a new pipe/play modem (code=AC) that, using ADPCM coding techniques, offers audio quality close to that of the PCM modem (code=AA), but generates only 4000 bytes/second of data instead of 8000. This modem is the modem of choice for voice mail, and is now the default modem type. - Added a new pipe/play modem (code=AD). This modem samples at the same rate as the DSP-12's FSK modems (14,400 samples/second) and is designed to allow the capturing of FSK samples to be used for FSK modem development. DSP Debugger: - Added a new command code ("S") that causes the V40 processor to read any DSP-supplied host-port data and display this data on the terminal in hex. This dump process is stopped with any keystroke. This dump process is useful for DSP development. ACARS - Added a new parameter named RAW, which defaults to OFF. When set to ON the DSP-12 will not perform text formatting on received messages but will simply send the received frame, including protocol characters and the CRC characters, directly to the terminal port. Signal Generator - Added a new signal generator mode that can generate sine, triangle, and square waves. The signal generated can be set to a single frequency or can sweep between two frequencies. Max frequency and sweep rate is about 10kc.