On 2025-01-31 7:06 a.m., Frank Leonhardt via cctalk wrote:

RTS could be used to seize a half-duplex line (DCE didn't mean full duplex  modem exclusively), and CTS would be asserted once the line was seized so you could start typing, start the tape reader.

I wanted to get a REAL computer for a long time, since the 70's and now I have nice 18 bit home-brew design, using 2 1508 CPLD's and 6 74LS219's for the ALU and a 1508 for the control logic.

Back then you could get TTY's and other HARD copy output devices
and paper tape I/O.

Now that have my 1977 computer (It uses 68A50 ACIA's) is there low
cost paper tape punch/reader emulator for just a plain 1200 baud serial port? All I have working now is just a serial boot strap and some ram.

A TTY emulator would be handy too, for me and all new PDP-8/11/10 emulators coming out.

Confusingly both the computer and terminal are called "Data Terminal Equipment" (DTE) and the modems are data communications equipment or DCE,

Indeed much fun was had with that one. As I said it only makes sense for attaching something to a modem :-)

So when did serial printers show up?

Regards, Frank.

Once I get better mother board PCB working, I then can
work on some kind of disk io, and timer interrupt.
No MMU is planned.

Ben.



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