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Re: Adt(pro)
"David Wilson" <mcs6502@gmail.com> wrote in message e4e95c56-ec03-4414-858c-4b691ab140e4@b38g2000prf.googlegroups.com">news:e4e95c56-ec03-4414-858c-4b691ab140e4@b38g2000prf.googlegroups.com...
On Sep 19, 2:16 pm, "Bill Garber" <willy4...@comcast.net> wrote:
"David Wilson" <mcs6...@gmail.com> wrote in messagebc6ac1d2-ca03-49ea-bb09-02fe018c2bdb@b38g2000prf.googlegroups.com">news:bc6ac1d2-ca03-49ea-bb09-02fe018c2bdb@b38g2000prf.googlegroups.com...
> The $10 stored in the control reg selects 1 stop, 8 bits, ext rx clk,
> XTL/16 bps where XTL = 1.8432 MHz so the baud rate is 115200 bps.
> The $0B is stored in the command reg and selects no parity, no echo,
> RTS & DTR asserted, no IRQs.
So, uh, can you set an external modem this way?
Yes, but...
1) You will need hardware flow control as the 6551 only has a one byte
input buffer.
2) My Rockwell manual does not show this but I seem to recall that
some (all?) 6551 chips will corrupt the byte currently being sent if
CTS is deasserted mid-character - the 65C51 does not have this
problem.
3) You really need an accelerator card/chip to take advantage of the
higher throughput.
As usual, you made the assumption that I implied that
I would want my modem set to 115,200 baud, and I did
not. If I had meant that, I would have said, "to these
settings". ;-) I try to say what I mean, and mean
what I say, and have come to the conclusion that people
don't hear correctly. ;-)
Bill Garber from GS-Electronics
http://www.garberstreet.com
"If you wish to forget anything on the spot,
make a note that this thing is to be remembered."
(Edgar Allen Poe)