xtr-modem {1/2}

Hello Ivan! Description of xtr is in 26 news: NEWS ══════════════════════════ (c) Alexey Mikhailov This is perhaps the most interesting news for network users - going out but- vogo modem, modem, which in my opinion will become the modem of the future in SpbZxNet, and perhaps it is possible throughout the rest of the country, especially in those regions where modem communication on the ZX is just raising his head, or not yet began its existence. As a Coordinator, as a Sysop, as simply Sinclairist, I cannot be left by equal- stifling is the fact that thanks to development networks continue to develop, both Spectrum and XTR-modem is living proof of this. Time hardware workers, too as well as software, have always depended on consumers, and now they see that the network grows that good old Wikomm in different ways reasons people are no longer satisfied with. Many people cannot call daytime calls. tions because at work, and in the evening, in the sa- my convenient time, sometimes it’s just not to break through - some sysops are already forced We will stop registering new users tel due to the large number of points and users who sometimes arrange real PILE UP. Well, at night I want to sleep... Yes, and The maximum speed of the Wicommka is 2400 baud: it's not that much at least I would like more.And now the time has come to say NO accept- tive transformer, which costs simply a huge amount due to the fact that it Only one person produces in the city - Sergei Usov, who is to some extent nor a monopolist. It would be nice to have that kind of money pay for a normal modem, but not for Vi- comm after all! In a nutshell, what the new mo- dem. Firstly, raise/lower the handset without "gadget", secondly, determine the number caller, dial automatically by any number (several numbers) that provides unique opportunities for bbs software and for simple points: incl. chili computer in the evening, went to bed, modem itself got through to bbs, leaked mail and files, sent your mail, and you this morning (or after work) calmly and without any nervousness you're sitting there shakingly and reading your mail - it's wrong - yeah, just great? Not bad speed - 3200 is promised even on bad lines, and on good ones - much higher, ease of connection In the end, I plugged it into the system connector, and that’s it! The new modem will cost no more than Vicom- ma. So I believe that sooner or later the entire network will still switch to XTR-mo- dem's, in fact, it's only a matter of software... Well, now - a word from the authors. ────────────────────────── (c) X-TRADE GROUP XTR-modem Now it's time to please the SPEC world -CY - XTR is made, debugged and put into production Vodka The announcement in ZF#5 was intended to inform tion about the need for this product on the market. We got this information, thanks to which the first one is expected by April 10th batch of modems. To satisfy everyone's interest, I will tell you Briefly about the concept of a modem. ----- IRON ----- Initially, we planned to improve create VICOMM and make it as de- sewn Alas, half measures did not lead to anything, the initial defectiveness of VICOMM did not allow was able to realize all the ideas, namely: it was possible possibility of automatic (without button) line answering, call monitoring and busy control lines. All this gives unprecedented opportunities possibilities, such as: pulse and tone dialing, automatic redial, op- Dividing the number dialed from parallel new phone, automatic detection calling subscriber number (AON), and in the mode me modem improved service and increased quality quality of reception/transmission. It’s not for nothing that I focus on the side function tion of the modem - AOH, because I think AOH is without- seems like a useful and necessary function in a modem. Therefore, software compatibility with VI- COMM was lost, but not completely. When communicating online, the process looks like this: in the following way: you turn on the car, launch the program, turn off the monitor, turn off your phones so they don't ring, and go to bed. And in the morning, over a cup of tea anda plate of semolina porridge, you flip through the our messages. The modem has become internal (this reduces the cost design) - it plugs into the SCORPI slot - ON/KAY and its connection is not supported heating up the soldering iron. Connecting to others SPECTRUM-compatible machines will be accompanied by turning on the soldering iron and using it according to the instructions. The modem is galvanically isolated from line (breakdown voltage 1.5 Kv). Time the mating is done using optocouplers, not transformer, as in VICOMM, which again still reduces the cost of the design and reduces it dimensions. All final standards are met telephone network device (maximum leakage 250 µA, maximum voltage - 220 V, maximum current - 100 mA). When the computer is turned off, when the modem is on do not use, as well as by pressing RESET, The modem disconnects from the line and does not provide no influence on her. The signal part of the modem has a frequency transmission bandwidth of more than 20 kHz, when it is more than 10 kHz, which is more than enough but for exchange at 3200 baud (if the line and station will allow). Maximum tested speed - 3900 baud, the results are encouraging - vayut. An important detail: the appa- military support for exchange with a modem gating the process of selectable quartz- frequency using the WAIT signal. The idea is this - the program is written according to the clock cycleCPU SPECCY frequency is not lower than, say, 3.2 MHz, and all machines with a higher frequency slow down to the required level. Unfortunately, there is a limitation - no more than 7.0 MHz (typically howl TURBO mode). This is very convenient - the quality of communication is not hangs from a temporary car and does not need to be used press the TURBO button, everything works just like that, including CONNECT SCORPION-PENTAGON. It is possible to transmit an analog signal to the line Nala with quantization at 16 levels post- by means of PWM modulation with a sampling frequency tization up to 23 kHz (voice capabilities AOH RUS-16 and higher, as well as DIGITAL STU- DIO). Structurally, the device represents a a printed circuit board measuring 75*70 mm and co- holds the connector in the form of a SCORPION/KAY slot and telephone line connector. Current consumption from the SPECCY power supply about 100 mA. +12 V is not required. ----- SOFT ----- While the modem is in production, we are adapting existing terminal programs, as well as We’re writing new ones. Already remade MODEM 3.6 and The AOH program was written. The converted MODEM 3.6 can be used called for XTR-VICOMM communication. This project is supported by OMEGA GROUP and Macro-Modem program will be adapted under XTR. We are confident that XTR will completely replace all VICOMMs and will become a standard on boards form ZX-SPECTRUM. ----- WISHES ----- We know that for today, except for Peter and In Moscow, there are no traces of modems anywhere. ATherefore, we suggest - try this product and in your region, you won't regret it. -+- iS-DOS 4.5