[Gmecm] Sunbird/$58 ALDL protocol

[Bill Shaw]

Hi Robin,

The $58 code is very timing sensitive.  It's been a while since I've played
with it so the details are a bit fuzzy,  but as I remember you have to send
a mode change within a couple hundred milliseconds of the 'chatter' packet
to get it to shut up and start taking commands.  Once you change mode it'll
respond OK to your commands until it times out aned returns to 'chatter'
mode.  Do you have the Turbo-P4 doc?  It's spelled out pretty well in there,
look for 'turbo_p4' or something like that on incoming.

Best,

Bill

> From: "Robin Handley" <Robin at FuryWorld.fsnet.co.uk>
> Reply-To: gmecm at diy-efi.org
> Date: Sun, 4 Jun 2006 15:45:12 +0100
> To: <gmecm at diy-efi.org>
> Subject: [Gmecm] Sunbird/$58 ALDL protocol
> 
> I've noticed different behaviour on ALDL between ANHT/$8D and Sunbird/$58
> code in my '727. The ANHT/$8D seems to behave more 'sensibly/predictably.'
> than the Sunbird/$58 code!
> 
> I'm currently trying to find a robust algorithm to talk to the Sunbird/$58
> code. I have modified ALDLMON (which works but takes longer to lock on than
> it does with ANHT/$8D) and played around with some noddy programs of my own
> (not w/o some issues, which I'm still trying to get to the bottom of). Has
> anybody played with ALDL from Sunbird/$58? The code chucks out $F0 $55 $BB
> repeatedly. The Turbo code doc. indicates that the ALDL monitor should
> reply, but does not appear to say with what. Anybody know what the correct
> response is?
> 
> Robin
> 
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