Mountain State InfoSystems P.O. Box 6234 Wheeling, WV 26003 Megalist BBS: (304) 797-0277 (c) 1992, Mountain State InfoSystems All products and company names are registered trademarks of their respective companies. -------------------------------------------------------------------- Announcing the TWINCOM 14.4DF Modem from Mountain State InfoSystems! -------------------------------------------------------------------- "The best value in communications hardware today!" - Personal Computer World - June, 1992 "Using the TWINCOM was simple and breathtaking." - PC SOURCES - November, 1991 "TWINCOM is a clear winner by any standard." - COMPUTER SHOPPER - December, 1991 Yes, the TWINCOM 14.4DF (v.32bis, v.42bis) Data + Fax Modem has received terrific reviews! As a matter of fact, it received "Best Board Design" honors from Rockwell International. The TWINCOM 14.4DF Modem + FAX uses the 14,400 bps world standard v.32bis. Featuring v.42bis, v.42, and MNP 2-5 data compression and erro correction, the unit can generate effective throughput of up to 57,600 bps! It will transfer data 24 times faster than a 2,400 bps modem! The TWINCOM 14.4DF Modem + FAX uses the high-speed Group 3 (V.17) standard, which is the newest genveration of ultra fast FAX. The TWINCOM 14.4DF will connect to all Fax machines and Fax boards at ALL standard speeds. Quite a time and money saver! Mountain State InfoSytems sells both the internal and external TWINCOM 14.4DF MODEM + FAX. --------------------------------------------------------------------------- Technical Data for External TWINCOM 14.4DF --------------------------------------------------------------------------- MODEM ----- TRANSMISSION 14,400 bps with auto-fallback to 12,000 9,600, 7,200, 4,800, 2,400, 1,200, and 300 bps. DATA TRANSFER RATES Up to 57,600 bps with v.42bis, up to 28,800 bps with MNP 5. STANDARDS CCITT v.32bis, v.22bis, v.22, v.21, and Bell 212A & 103 DATA COMPRESSION v.42bis (BLTZ) AND MNP 5 ERROR CORRECTION v.42 (LAP-M) and MNP 2, 3, 4 DIAGNOSTIC TESTING Remote digital loopback and remote digital loopback with self test, Local analog loopback and local analog loopback with self test, and Power-on self test. TELEPHONE LINE Dial-up and 2 wire lease line, adaptive tone/pulse dialing, line quality and receive line monitoring. DATA MODES Synchronous and Asynchronous MISCELLANEOUS Automatic retrain with auto dial, redial and answer Enhanced AT command set Extended MNP Commands Speed buffering and flow control Selectable line impedance matching networks FAX --- TRANSMISSION 14,400 bps send and receive with auto- fallback to 9,600 STANDARDS CCITT v.17, v.29, v.27ter, and v.21 channel 2, Class 1 & 2, Group 3 TRANSMIT AND RECEIVE True background operation with broadcast and group identification MEMORY REQUIREMENTS 640kb RAM with Hard Disk DOCUMENT FORMAT ASCII, PCS, TIF, BMP, IMG, CUT files, HP Print Capture, Word Perfect, Microsoft Word, Multi-Mate, and Wordstar Documents ANSWER Auto Answer / Busy Redial SOFTWARE FEATURES Pull Down Menus and Mouse Support, Phone Number Management, FAX Cover and Letterhead Merge with Complete Background Operation Hardware -------- DIMENSIONS 8.5" (L) x 5.5" (W) x 1.5" (H) POWER REQUIREMENTS 120 Volts AC, 60 cycle, Triple Output Regulated UL Power Supply (very nice) COMPUTER INTERFACE RS232, 25-pin Connector TELEPHONE INTERFACE One RJ11 and one RJ45 Connector (The RJ45 connector also accepts RJ11 plugs) SPEAKER VOLUME Software Programmable MEMORY Non-volatile memory for 4 telephone numbers and two configurations ------------------------------------------------------------------------- ------------------------------------------------------------------------- Specifications are same for the INTERNAL TWINCOM 14.4DF, except it is on an 8-bit card and includes 16550 UART with FIFO buffering to prevent loss of data and to increase operation speed even further! The TWINCOM 14.4 DF comes with a two-year manufacuter's warranty and a 30-day money-back guarantee from MSI. Manufactured in the USA! Built with high-speed Surface Mount Technology. You can order the INTERNAL OR EXTERNAL TWINCOM 14.4 DF MODEM + FAX from Mountain State InfoSystems by calling: The Megalist BBS: (304) 797-0277 14.4 bps - 2400 bps (up to 57,600 bps) v.32bis / v.42bis / MNP 2-5 For faster service, order your TWINCOM modem online using Mastercard or VISA! Call anytime, 24 Hours / Day, 7 Days / Week or you can order using the order form included below. October 3, 1992 --------------- Pricing: External TWINCOM 14.4 DF.........................$320 Internal TWINCOM 14.4 DF.........................$280 Shipping & Handling..............................$10 (All orders shipped 2-day UPS) Pricing subject to change without notice. 旼컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴커 � Our Customers say that they get � � 1700 CPS on downloads with a 14.4k modem � � and 1100 CPS with all other modems!! � 읕컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴켸 WHAT IS THE 16550 AND HOW CAN IT BENEFIT COMMUNICATIONS? The chip, formally known as the NS16550AFN chip, is the heart of your serial board. It is the UART chip, or Universal Asynchronous Receiver/ Transmitter. The advantage of the 16550 over the older 16450 and 8250 UARTs is that it has a 16 byte buffer on it. Now, sixteen bytes doesn't sound like a whole heck of a lot but it is SIXTEEN TIMES the size of the buffer on the older UARTs which only had a one byte buffer. The advantages of the 16-byte buffer are two fold: 1) It makes high speed communications more reliable. On the older chips, with their one-byte-buffer, you would lose data if a second byte came in from the modem before the CPU had a chance to pull the first byte out. The 16550, with its 16-byte-buffer, gives the CPU up to 16 chances to pull the data out before a character is lost. To realize what this means you can figure that at 19200 bps you are expecting the CPU to service the comm port 1920 times each second or once every .0005 seconds. If the CPU happens to take .0006 seconds to get around to servicing the comm port then in a one-byte buffer UART that first byte is lost. On the 16550 chip, with 16 bytes of buffer space, you have up to .008 seconds to service the comm port. 2) It helps make a multitasking system more efficient. When PCBoard is transmitting data it has to stop the CPU and fill the UART's transmitter buffer. That means that if the caller in the background is doing a directory scan his scan will take longer while PCBoard attempts to send data out to the first caller. In the one-byte-buffer UARTs at 19200 bps PCBoard must stop the CPU 1920 times each second just to send data out the comm port. With the 16550, however, it can stuff up to 16 bytes into the buffer at a time and therefore interrupts the CPU only 120 times each second. That drops the performance hit on the CPU, even at high speeds, to almost that of a 1200 to 2400 bps modem! To top it off... the older 8250 chips were buggy, making them less reliable, and they were never designed for the high speeds that we expect out of our modems today. The NS16550AFN, on the other hand, is designed with high bus speeds and high modem speeds in mind. When multitasking, even at slower baud rates, the 16550 can be very helpful in providing smooth operation for the entire system. MSI Order Form ============== Mountain State InfoSystems Attention: Modems P.O. Box 6234 Wheeling, WV 26003 Your Name: ________________________________________________ Address: ________________________________________________ City: _______________________ State: _______________ Zip Code: _______________________ Name Of Your BBS: _________________________________________ Phone Numbers(s): (Voice) _______________ (Data) ________________ Please Check: [ ] TWINCOM 14.4 DF EXTERNAL MODEM............................$320 ($10.00 Shipping) [ ] TWINCOM 14.4 DF INTERNAL MODEM............................$280 ($10.00 Shipping) [ ] MSI ULTRA-HIGH-SPEED COMMUNICATIONS CARD..................$ 64.95 ($3.00 Shipping) 1 - 25-pin Serial Port 1 - 9-pin Serial Port 1 - Parallel Port 1 - Game Port 1 - 16550 UART (National Semiconductor) 1 - 16450 UART [ ] MSI ULTRA-HIGH-SPEED COMMUNICATIONS CARD - DELUXE.........$ 74.95 ($3.00 Shipping) 1 - 25-pin Serial Port 1 - 9-pin Serial Port 1 - Parallel Port 1 - Game Port 2 - 16550 UARTs (National Semiconductor) Excellent for multitasking using two high-speed modems, such as running two nodes off of the same computer using Windows or DesqView. Product Total...........................$________________ Shipping................................$________________ WV residents add........................$________________ 6% WV State Sales Tax Here Total...................................$________________ Payment Method -------------- _____Personal Check ______Money Order _____Credit Card Credit Card Type: _____Master Card _____VISA Name on Credit Card_____________________________________________ Credit Card Number______________________________________________ Expiration Date_____________________________ Your Signature______________________________________________ Make check or Money Order payable to Mountain State InfoSystems. Our TWINCOM modems come with a two-year manufactuer's warranty and a 30-day money-back guarantee. We back our Communications cards with the industry-standard 30-day money-back guarantee if not satisfied and a 90-day parts and labor warranty. We reserve the right to repair or replace defective items. All orders are shipped within one week of order unless otherwise noted. Returned merchandise must be received by MSI in its original condition. Shipping charges are non-refundable. No surcharge for MasterCard or VISA.