                          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.

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Announcing the TWINCOM 14.4DF Modem from Mountain State InfoSystems!
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"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.

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Technical Data for External TWINCOM 14.4DF
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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
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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.


            Ŀ
                    Our Customers say that they get       
               1700 CPS on downloads with a 14.4k modem   
                 and 1100 CPS with all other modems!!     
            
                                                                   
          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.                          