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Re: Adt(pro)


"David Wilson" <mcs6502@gmail.com> wrote in message bc6ac1d2-ca03-49ea-bb09-02fe018c2bdb@b38g2000prf.googlegroups.com">news:bc6ac1d2-ca03-49ea-bb09-02fe018c2bdb@b38g2000prf.googlegroups.com...
On Sep 19, 6:39 am, "John B. Matthews" <nos...@nospam.invalid> wrote:


> > >> Translation:
> > >> LDA #$10
> > >> STA $C08B ;ACIA_Control Register
> > >> LDA #$0B
> > >> STA $C0AA ;ACIA_Command Register
> > >> LDA $C0A8 ;ACIA_Data
> > >> RTS



> Ah, I see. Then there's some kind of 32x external clock?
> $0B (%00001011): 1 stop bit, 8 data bits, external clock, 3600 baud.



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? 
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)