*****hayes modem history.....

"ed sharpe" <esharpe(a)uswest.net> wrote: > well in looking into the s100 board it seems to indicate that many

As I wrote before, it is not. Definitely. No question about it. It doesn't have ANY command set in the sense of sending it a string of characters that it would parse as a command. It's a dumb device. (And there's nothing wrong with that!) If by "sent to it" you mean "the user program fiddles with bits in registers using 8080/Z-80 style input and output instructions", yes, that is how it is controlled. Want it to pick up the phone line? Set a particular port bit. Clear the bit to hang up (or maybe it was the other way around). Pulse dial by toggling that bit with the appopriate timing. Enable the modulator (transmit) with a different bit, and write to the UART to send bytes. Read a bit of a port for receive carrier detect. Etc. Basically the same though the registers are memory mapped since the 6502 doesn't have I/O instructions. However, the Apple version has firmware that makes it easier to use. It's still not the AT command set, but from BASIC you type "IN#2" (if it was in slot two), then use Control-A as an attention character to send it commands from the keyboard. I suppose you probably printed a control-A followed by a command in order to control it from BASIC, just like printing a control-D followed by a DOS command, but my memory is fuzzy on that as I mostly programmed it in assembly.