🚀 go-pugleaf

Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:

> I have reposted this here as nobody knows what I'm talking about in
> demon.ip.support.mac, or am I talking crap?
> 
> For some reason I am unable to use any DTE rate above 57600.  If I select
> 115000, (or above) in FreePPP 2.6b4, when I connect I get a dialog which
> states: The selected DTE rate is not supported by this computers driver,
> 57600 will be used instead.
> 
> I have always used 115000 before.
> 
> It occured after upgrading to OS 8, I noticed the modem control panel,
> disabled it, resarted, enabled it, resarted, and now I can't connect
> faster than 57600.
> 
> Performa 5200, GV platinum 33.6, FreePPP 2.6b4, OS 8.1

This is written into your modem script. You can change it back if you
are brave.



-- 
Getting an education is a bit like a communicable sexually disease, It
makes you unsuitable for lots of jobs, then you have the urge to
pass it on.
                                                 T Pratchett

Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:

> I have reposted this here as nobody knows what I'm talking about in
demon.ip.support.mac,
> or am I talking crap?

No you're not.

[snip]

> Performa 5200, GV platinum 33.6, FreePPP 2.6b4, OS 8.1
> 
> Thanks for any help

At a rough guess, you've got non-DMA (direct memory access) serial
ports.  Apple's original serial driver call allowed you to select serial
port speeds up to 57600 bit/s and no higher.  Apple decided to write a
new serial port call when the DMA serial port Macs came out, and only
DMA serial port Macs can use this new version, which allows you to
select serial port speeds above 57600 bit/s.

Now then...  The clever chaps who write FreePPP worked out a hack so if
you didn't have a DMA serial port, you could still select speeds above
57600 bit/s (that limit wasn't a limit for the early Macs which can just
about handle 19200 bit/s serial communication over a PPP link with
normal software).  This doesn't help with older Macs, but my 25MHz
60LC040 475 is happy at 115200 bit/s - you need a fairly nippy processor
to avoid losing packets at higher serial port speeds without DMA.

My guess is that this hack breaks under OS8.1 for some strange reason.
Might I suggest an email to the FreePPP developer(s)?

Rowland.


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Bill Bedford <billb@mousa.demon.co.uk> wrote:

[snip]

> This is written into your modem script. You can change it back if you
> are brave.

He's using FreePPP which doesn't necessarily use a connection script.
OT/PPP won't let you use a serial port speed above 57600 bit/s under any
circumstances unless you have a DMA serial port and the new serial
driver routine.

Rowland.

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Sorry - the spam got to me.          
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Bill Bedford wrote:
> 
> Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:

> > For some reason I am unable to use any DTE rate above 57600.  If I select
> > 115000, (or above) in FreePPP 2.6b4, when I connect I get a dialog which
> > states: The selected DTE rate is not supported by this computers driver,
> > 57600 will be used instead.
> >
> > I have always used 115000 before.
> 
> This is written into your modem script. You can change it back if you
> are brave.

I'm brave, if your sure this is it.

-- 
Lawrence Flowers                  |   If I hadn't seen such riches,
LEAF TECHNICAL SERVICES LIMITED   |   I could live with being poor.
http://www.leaftech.demon.co.uk   |
leaf@leaftech.demon.co.uk         |   James

Rebecca and Rowland wrote:
> 
> Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:
> 
> > I have reposted this here as nobody knows what I'm talking about in
> demon.ip.support.mac,
> > or am I talking crap?
> 
> No you're not.
> 
> [snip]
> 
> > Performa 5200, GV platinum 33.6, FreePPP 2.6b4, OS 8.1
> >
> > Thanks for any help
> 
> At a rough guess, you've got non-DMA (direct memory access) serial
> ports.  Apple's original serial driver call allowed you to select serial
> port speeds up to 57600 bit/s and no higher.  Apple decided to write a
> new serial port call when the DMA serial port Macs came out, and only
> DMA serial port Macs can use this new version, which allows you to
> select serial port speeds above 57600 bit/s.
> 
> Now then...  The clever chaps who write FreePPP worked out a hack so if
> you didn't have a DMA serial port, you could still select speeds above
> 57600 bit/s (that limit wasn't a limit for the early Macs which can just
> about handle 19200 bit/s serial communication over a PPP link with
> normal software).  This doesn't help with older Macs, but my 25MHz
> 60LC040 475 is happy at 115200 bit/s - you need a fairly nippy processor
> to avoid losing packets at higher serial port speeds without DMA.
> 
> My guess is that this hack breaks under OS8.1 for some strange reason.
> Might I suggest an email to the FreePPP developer(s)?
> 
> Rowland.

An excellent hypothesis, and thank you for your time.

Do you think reverting to an earlier version of PPP might help?  I have
changed it recently.

I will notify the FreePPP group anyway.

Thanks again

-- 
Lawrence Flowers                  |   If I hadn't seen such riches,
LEAF TECHNICAL SERVICES LIMITED   |   I could live with being poor.
http://www.leaftech.demon.co.uk   |
leaf@leaftech.demon.co.uk         |   James

Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:

> Bill Bedford wrote:
> > 
> > Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:
> 
> > > For some reason I am unable to use any DTE rate above 57600.  If I select
> > > 115000, (or above) in FreePPP 2.6b4, when I connect I get a dialog which
> > > states: The selected DTE rate is not supported by this computers driver,
> > > 57600 will be used instead.
> > >
> > > I have always used 115000 before.
> > 
> > This is written into your modem script. You can change it back if you
> > are brave.
> 
> I'm brave, if your sure this is it.

I'm fairly sure this isn't it.

Rowland.

-- 
Remove the animal for my email address:   rebecca@astrid.dog.u-net.com
Sorry - the spam got to me.          
PGP pub key A680B89D; fingerprint: F5605EAE F56F2C0B 818F3319 5227767F
                                   What?  Don't ask me - I don't know.

Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:

[snip]

> Do you think reverting to an earlier version of PPP might help?  I have
> changed it recently.

Hmm...  I doubt it'll help, but it's probably worth trying anyway.

Rowland.

[snip]


-- 
Remove the animal for my email address:   rebecca@astrid.dog.u-net.com
Sorry - the spam got to me.          
PGP pub key A680B89D; fingerprint: F5605EAE F56F2C0B 818F3319 5227767F
                                   What?  Don't ask me - I don't know.

Rebecca and Rowland wrote:

> Hmm...  I doubt it'll help, but it's probably worth trying anyway.
> 
> Rowland.

Did you really log on at 07.50 Sunday morning?

-- 
Lawrence Flowers                  |   If I hadn't seen such riches,
LEAF TECHNICAL SERVICES LIMITED   |   I could live with being poor.
http://www.leaftech.demon.co.uk   |
leaf@leaftech.demon.co.uk         |   James

Lawrence Flowers <leaf@teaftech.demon.co.uk> wrote:

> Rebecca and Rowland wrote:
> 
> > Hmm...  I doubt it'll help, but it's probably worth trying anyway.
> > 
> > Rowland.
> 
> Did you really log on at 07.50 Sunday morning?

Yes - I'm running on a roughly 180 degree phase shift at the moment.

Rowland.

-- 
Remove the animal for my email address:   rebecca@astrid.dog.u-net.com
Sorry - the spam got to me.          
PGP pub key A680B89D; fingerprint: F5605EAE F56F2C0B 818F3319 5227767F
                                   What?  Don't ask me - I don't know.