Re: Adt(pro)

[BLuRry <brendan.robert@gmail.com>]

On Sep 18, 12:25 am, David Schmenk <dschm...@YUCH.gmail.com> wrote:
> John B. Matthews wrote:
> > In article
> > <5c7612ce-a123-48e8-b454-585404ab4...@59g2000hsb.googlegroups.com>,
> >  BLuRry <brendan.rob...@gmail.com> wrote:
>
> >>>>>> all charecter output was displayed on the computer as a bunch of
> >>>>>> garbled characters.  
> >> The //c com port starts off at 300 baud by default -- and depending on
> >> your cable disable flow control.
>
> >> You can change the baud rate on the //c by keystrokes documented in
> >> the //c reference manual (control-A, # b -- where # is the number
> >> setting of the baud you want to set.  Can't remember what those are
> >> off the top of my head though)
>
> >> You can key this in from the monitor to kick it in to 115.2 kbaud
> >> (115200 baud):
>
> >> 300: a9 10 8d 8b c0 a9 0b 8d aa c0 ad a8 c0 60
> >> 300g
>
> >> Translation:
> >> LDA #$10
> >> STA $C08B ;ACIA_Control Register
> >> LDA #$0B
> >> STA $C0AA ;ACIA_Command Register
> >> LDA $C0A8 ;ACIA_Data
> >> RTS
>
> >> Note: This is an undocumented setting which somehow works.  Don't
> >> ask.  :-D
>
> > Sorry, I'm //c challenged: Is this a 6551 ACIA? Here's some info I
> > collected:
>
> > <http://home.woh.rr.com/jbmatthews/ssc.html#tbl1>
>
> > I'm surprised that the Control register isn't mapped to slot 2 ($C0AB)
> > like the other two registers in this code.
>
> He just typo'd.  It is $C0AB.  Usually you would access the register as
> $C08B,Y with Y being the slot << 4.  The IIc has the the two 6551's
> mapped in slot 1 and slot 2 so the IIc Tech Ref manual uses the
> non-indexed addresses.

Correct .. was a typo.  I was disassembling that by sight and got a
little jumbled.   That should read STA $C0AB.  Anyway, that bit of
code is used by the game server to kick the //c serial port to go
faster.