🚀 go-pugleaf

Craig Lynch <twenty@iol.ie-nojunkmail> wrote:

> I'm a bit confused about modem strings. I got this info from a BBS program
> called BulkRate:
> ____________________________________________________________
>  The bottom line is that in most instances, if you turn hardware
> handshaking on, you must set the modem to ignore the status of the DTR
> line. (Typically the correct command is &D0, though your modem may vary.)
> Failure to do this will cause unwanted disconnects, especially when
> downloading or otherwise transferring a lot of data to your Mac.
> 
> Note also that this advice is not unique to BulkRate; it applies to all
> uses of high-speed modems with the Macintosh.
> ____________________________________________________________
> 
> But modem init strings for the mac always seem to have &d2 in them,
> meaning DTR disconnects. I have been using a string with &d2 in it for
> ages with no problem... apart from dropping the line once in a blue
> moon... and have changed it to &d0 now because someone said I should.
> Still no problems of course. I'm on a Performa 450. Can someone clarify
> this? If your modem will disconnect unless it's got &d0 in the string, why
> do all mac modem strings seem to have &d2 in them?
> cl

Hmm...  This has been puzzling me for some time.  I *think* it's because
some Macs (the early ones - up to the Plus or thereabouts) and perhaps
some others don't have hardware handshaking fully implemented - I
*think* the DTR line is used for something else, or something like that.

On top of that, some modems (GV, for example) don't do all the hardware
handshaking stuff anyway - I gather the Rockwell chipset used in GV
modems is missing something needed for that.

All this is a bit woolly because I've not yet come acros any firm
information - hope it sheds a bit of light.

Rowland.


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