31 Jan
2025
31 Jan
'25
7:23 a.m.
On 2025-01-31 7:06 a.m., Frank Leonhardt via cctalk wrote:
So when did serial printers show up?
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 :-)
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.