Vintage Hayes SmartModem 1200 External Baud Dial-Up Modem, US $500 – Picture 0

Vintage Hayes SmartModem 1200 External Baud Dial-Up Modem, US $500 – Picture 1

Vintage Hayes SmartModem 1200 External Baud Dial-Up Modem, US $500 – Picture 2

Vintage Hayes SmartModem 1200 External Baud Dial-Up Modem, US $500 – Picture 3

Vintage Hayes SmartModem 1200 External Baud Dial-Up Modem, US $500 – Picture 4

Vintage Hayes Smartmodem 1200 External Baud Dial-up Modem

US $500

Minden City, Michigan, United States
Jan 30th

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I bought this at a sale that was going out of business. Don't know anything about it. Selling it as is. The black face has a small crack as you can see in the picture. Does not come with any cords. The information below I pulled off line. The Hayes Smartmodem 1200 (I'll refer to it as HS1200 from this point on) allows your computer to access the outside world via the telephone lines. So what, you say, that's what they all do! Correct, but the HS1200 is one heck of a souped-up way to do it. Many modems allow operation at 300 baud, while others allow 1200 baud. The HS1200 allows both and is restricted only by the baud rate of the device with which you are communicating. In addition the HS1200 is very "smart," hence its name. How smart is it? I'll address the above question by first describing what is behind the intelligence of this modem. The HS1200 has an internal Z8 (not Z80) microprocessor. Along with this, the real "brains" behind the operation is a 4K ROM controller program. What does this 4K ROM allow you to do? The program allows the modem to communicate with either you or the computer. This modem can be given commands and will answer you with either English replies or numbers. There are too many commands to discuss, but the most important commands are: A -> Answer the phone. A/ -> Repeat the last command given (it remembers). D(TP) -> Dial the phone (touch or pulse dial). H -> hang up the phone. This is a very brief list, but it gives you an idea of the capabilities the modem has. The commands usually have parameters which are sent along with the command. For example, to dial a phone number one would send the modem AT (attention modem) DT 1-401-845-7742 (Dial the number touch-tone dialing 1-401-845-7742). Without the explanation, the command would be ATDT 1-401-845-7742. Upon receipt the modem would "pick up the phone" and dial the number listed. Actually, with this modem you do not need a telephone at all! Everything is built inside the unit. The wire coming out of the wall connects directly to the modem. Hayes Smartmodem 1200 There are actually two states that the modem can be in. COMMAND state allows you to send commands to the modem (nothing goes across the telephone lines). ON-LINE state is automatically entered when the modem detects a carrier signal and hooks into the remote computer, or when the modem answers the telephone and then allows another computer to hook into it. You may have noticed that I said that the modem answers the phone. This is another feature commonly called AUTO-ANSWER. The modem can be programmed to answer the phone on the number of rings specified (1-255). This can be useful for running a bulletin board, having your computer waiting for you to call from a remote location or zapping a crank caller with a carrier signal they don't expect. One question which probably comes to mind: If I don't need a phone with the modem, how do I know what is occurring on the line when I dial a BBS or remote computer? The modem is equipped with an internal speaker and allows you to monitor the call. The modem does not have a microphone, so you cannot talk to anyone while it is connected.